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Inter-AS Model C for VLL
In This Chapter
This section describes advanced inter-AS model C for VLL configurations.
Topics in this section include:
•
Applicability
•
Overview
•
Configuration
•
Conclusion
 
Applicability
This configuration note is applicable to all of the 7750 SR, 7710 SR and 7450 ESS series (including mixed mode). The information was tested with SROS 8.0 R4.
Overview
SR OS 8.0R1 adds the support for RFC 3107, Carrying Label Information in BGP-4, including VLL/VPLS. Starting with SR-OS 8.0R4, BGP SDPs have been extended and now can also be used with PBB-VPLS services.
ISPs are looking for mechanisms to implement the VLL/VPLS outside an autonomous system (AS). A service provider may have inter-AS operation as a consequence of delivering inter-provider VLL/VPLS or because they use multiple ASs as a result of acquisitions and merges.
The objective of this example is to describe the interconnection of VLL services across multiple ASs.
 
 
Network Setup
Figure 54 shows the network setup used.
Figure 54: Network Setup - Inter-AS Model C for VLL
The network topology displayed in Figure 54 consists of three sites in different ASs with each site using 7750 SRs.
In AS 64500, there are PE-3 and PE-1, AS 64501 has PE-9 and AS 64502 has PE-7 and PE-5.
There is a business customer with two remote locations, Site A and Site B, with customer edge (CE) devices CE-1 connected to the AS 64500 via PE-3 and CE-2 connected to the AS 64502 via PE-5. A VLL service is configured between PE-3 and PE-5 to connect site A and site B together.
Figure 55: Inter-AS Model C for VLL
Configuration
This section describes all of the relevant configuration tasks for the detailed setup shown in the Figure 56. In this particular example the following protocols are assumed to be already configured.
•
IS-IS as the IGP with all the nodes being level Layer1/Layer 2.
•
LDP as the MPLS protocol to signal the transport tunnels.
•
iBGP within each AS with family IPv4.
Figure 56: Network Setup Configuration
 
BGP Configuration
The following CLI output shows the BGP configuration — iBGP and eBGP — required for the PE routers to implement VLL Inter-AS.
The configuration on PE-9 in AS 64501 is displayed below:
configure router
        bgp
            rapid-withdrawal
            min-route-advertisement 1
            group "ebgp"
                family ipv4
                type external
                local-as 64501
                neighbor 192.168.1.2
                    peer-as 64500
                    advertise-label ipv4
                exit
                neighbor 192.168.2.2
                    peer-as 64502
                    advertise-label ipv4
                exit
            exit
        exit
 
The advertise-label ipv4 statement must be configured so that MPLS labels are carried with IPv4 NLRIs.
The configuration of PE-1 in AS 64500 is displayed below:
configure router
        bgp
            rapid-withdrawal
            min-route-advertisement 1
            group "ebgp"
                family ipv4
                type external
                export "export-systems" 
                neighbor 192.168.1.1
                    peer-as 64501
                    advertise-label ipv4
                exit
            exit
            group "ibgp"
                family ipv4
                type internal
                local-as 64500
                neighbor 192.0.2.3
                    next-hop-self
                    advertise-label ipv4
                exit
            exit
        exit
 
The configuration of PE-7 in AS 64502 is displayed below:
configure router
        bgp
            rapid-withdrawal
            min-route-advertisement 1
            export "export-systems" 
            group "ebgp"
                family ipv4
                type external
                local-as 64502
                neighbor 192.168.2.1
                    peer-as 64501
                    advertise-label ipv4
                exit
            exit
            group "ibgp"
                family ipv4
                type internal
                local-as 64502
                neighbor 192.0.2.5
                    next-hop-self
                    advertise-label ipv4
                exit
            exit
        exit
 
To complement the BGP setup, the configurations of PE-3 and PE-5 (the PEs to which the CEs are connected in AS 64500 and AS 64502), respectively, are displayed below:
PE-3:
configure router
        bgp
            rapid-withdrawal
            min-route-advertisement 1
            group "ibgp"
                family ipv4
                type internal
                local-as 64500
                neighbor 192.0.2.1
                    next-hop-self
                    advertise-label ipv4
                exit
            exit
        exit
 
PE-5:
configure router
        bgp
            rapid-withdrawal
            min-route-advertisement 1
            group "ibgp"
                family ipv4
                type internal
                local-as 64502
                neighbor 192.0.2.7
                    next-hop-self
                    advertise-label ipv4
                exit
            exit
        exit
 
 
 
Policy Configuration
The export policy on the PE-1 and PE-7 peering determines the system addresses leaked to the remote AS. It is worth noting here that it is important to modify the default origin attribute from incomplete to IGP in dual-homing scenarios otherwise the iBGP route will be always preferred over the eBGP route.
This is the configuration on PE-1:
configure router
        policy-options
            begin
            prefix-list "pe-systems-as64500"
                prefix 192.0.2.1/32 exact
                prefix 192.0.2.3/32 exact
            exit
            policy-statement "export-systems"
                entry 10
                    from
                        prefix-list "pe-systems-as64500"
                    exit
                    action accept
                        origin igp
                    exit
                exit
            exit
            commit
        exit
 
This is the configuration on PE-7:
configure router
        policy-options
            begin
            prefix-list "pe-systems-as64502"
                prefix 192.0.2.5/32 exact
                prefix 192.0.2.7/32 exact
            exit
            policy-statement "export-systems"
                entry 10
                    from
                        prefix-list "pe-systems-as64502"
                    exit
                    action accept
                        origin igp
                    exit
                exit
            exit
            commit
        exit
 
 
Service Configuration
Once BGP is configured, the configuration requires the service to be defined (Epipe 1). The focus here is a VLL service (noting that it is also possible to have a similar configuration with VPLS services).
The following CLI shows the service level configuration on PE-3:
configure
    service
        customer 1 create
            description "Default customer"
        exit
        sdp 35 mpls create
            far-end 192.0.2.5
            bgp-tunnel
            keep-alive
                shutdown
            exit
            no shutdown
        exit
        epipe 1 customer 1 create
            description "Tunnel to PE-5"
            sap 1/1/3:1 create
            exit
            spoke-sdp 35:1 create
            exit
            no shutdown
        exit
    exit
 
The following CLI shows the service level configuration on PE-5:
configure
    service
        customer 1 create
            description "Default customer"
        exit
        sdp 53 mpls create
            far-end 192.0.2.3
            bgp-tunnel
            keep-alive
                shutdown
            exit
            no shutdown
        exit
        epipe 1 customer 1 create
            description "Tunnel to PE-3"
            sap 1/1/3:1 create
            exit
            spoke-sdp 53:1 create
            exit
            no shutdown
        exit
    exit
Show Commands and Troubleshooting
On PE-3 we have BGP tunnels to the remote AS system addresses that are using LDP as a transport mechanism and the configuration of end-to-end SDPs over which TLDP service labels are exchanged.
The following output shows the SDP and LDP information:
*A:PE-3# show service sdp 
==============================================================================
Services: Service Destination Points
==============================================================================
SdpId    Adm MTU  Opr MTU  IP address       Adm  Opr         Deliver   Signal  
------------------------------------------------------------------------------
35       0        1552     192.0.2.5        Up   Up          BGP       TLDP  
------------------------------------------------------------------------------
Number of SDPs : 1
------------------------------------------------------------------------------
==============================================================================
 
 
*A:PE-3# show service service-using 
===============================================================================
Services 
===============================================================================
ServiceId    Type      Adm  Opr  CustomerId Service Name                       
-------------------------------------------------------------------------------
1            Epipe     Up   Up   1                                             
2147483648   IES       Up   Down 1          _tmnx_InternalIesService           
-------------------------------------------------------------------------------
Matching Services : 2
-------------------------------------------------------------------------------
===============================================================================
 
 
*A:PE-3# show router ldp session 
==============================================================================
LDP Sessions
==============================================================================
Peer LDP Id        Adj Type   State         Msg Sent  Msg Recv  Up Time        
------------------------------------------------------------------------------
192.0.2.1:0        Link       Established   1351      1351      0d 01:02:08  
192.0.2.5:0        Targeted   Established   123       123       0d 00:10:42  
------------------------------------------------------------------------------
No. of Sessions: 2
==============================================================================
 
 
The route-table shows that the system IP address of PE-5 is reachable using a BGP tunnel:
*A:PE-3# show router route-table 
===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix                                   Type    Proto    Age         Pref
       Next Hop[Interface Name]                                     Metric     
-------------------------------------------------------------------------------
192.0.2.1/32                                  Remote  ISIS     01h03m07s   15  
       192.168.4.2                                                  10
192.0.2.3/32                                  Local   Local    01h12m03s   0   
       system                                                       0
192.0.2.5/32                                  Remote  BGP      00h21m22s   170 
       192.0.2.1 (tunneled)                                         0
192.0.2.7/32                                  Remote  BGP      00h21m22s   170 
       192.0.2.1 (tunneled)                                         0
192.168.4.0/30                                Local   Local    01h10m50s   0   
       int-PE-3-PE-1                                                0
-------------------------------------------------------------------------------
No. of Routes: 5
===============================================================================
 
The tunnel-table below shows the details of the LDP, SDP and BGP tunnels. This is followed by the service details, noting that Epipe 1 is using SDP 3. A ping is used to show that there is IP connectivity from PE-3 to the system IP address of PE-5:
*A:PE-3# show router tunnel-table 
===============================================================================
Tunnel Table (Router: Base)
===============================================================================
Destination        Owner Encap TunnelId  Pref     Nexthop        Metric        
-------------------------------------------------------------------------------
192.0.2.1/32       ldp   MPLS   -        9        192.168.4.2    10            
192.0.2.5/32       sdp   MPLS  35        5        192.0.2.5      0             
192.0.2.5/32       bgp   MPLS   -        10       192.0.2.1      1000          
192.0.2.7/32       bgp   MPLS   -        10       192.0.2.1      1000          
===============================================================================
 
 
*A:PE-3# show service id 1 base 
===============================================================================
Service Basic Information
===============================================================================
Service Id        : 1                   Vpn Id            : 0
Service Type      : Epipe               
Name              : (Not Specified)
Description       : Tunnel to PE-5
Customer Id       : 1                   
Last Status Change: 09/03/2011 17:23:17 
Last Mgmt Change  : 09/03/2011 17:22:11 
Admin State       : Up                  Oper State        : Up
MTU               : 1514                
Vc Switching      : False               
SAP Count         : 1                   SDP Bind Count    : 1
Per Svc Hashing   : Disabled            
Force QTag Fwd    : Disabled            
-------------------------------------------------------------------------------
Service Access & Destination Points
-------------------------------------------------------------------------------
Identifier                               Type         AdmMTU  OprMTU  Adm  Opr 
-------------------------------------------------------------------------------
sap:1/1/3:1                              q-tag        1518    1518    Up   Up  
sdp:35:1 S(192.0.2.5)                    Spok         0       1552    Up   Up  
===============================================================================
 
 
*A:PE-3# ping 192.0.2.5 
PING 192.0.2.5 56 data bytes
64 bytes from 192.0.2.5: icmp_seq=1 ttl=64 time=3.20ms.
64 bytes from 192.0.2.5: icmp_seq=2 ttl=64 time=3.72ms.
64 bytes from 192.0.2.5: icmp_seq=3 ttl=64 time=3.92ms.
64 bytes from 192.0.2.5: icmp_seq=4 ttl=64 time=3.59ms.
64 bytes from 192.0.2.5: icmp_seq=5 ttl=64 time=3.54ms.
 
---- 192.0.2.5 PING Statistics ----
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min = 3.20ms, avg = 3.59ms, max = 3.92ms, stddev = 0.235ms
 
The same commands on PE-5 are shown below:
*A:PE-5# show service sdp 
==============================================================================
Services: Service Destination Points
==============================================================================
SdpId    Adm MTU  Opr MTU  IP address       Adm  Opr         Deliver   Signal  
------------------------------------------------------------------------------
53       0        1552     192.0.2.3        Up   Up          BGP       TLDP  
------------------------------------------------------------------------------
Number of SDPs : 1
------------------------------------------------------------------------------
==============================================================================
 
 
*A:PE-5# show service service-using 
===============================================================================
Services 
===============================================================================
ServiceId    Type      Adm  Opr  CustomerId Service Name                       
-------------------------------------------------------------------------------
1            Epipe     Up   Up   1                                             
2147483648   IES       Up   Down 1          _tmnx_InternalIesService           
-------------------------------------------------------------------------------
Matching Services : 2
-------------------------------------------------------------------------------
===============================================================================
 
 
*A:PE-5# show router ldp session 
==============================================================================
LDP Sessions
==============================================================================
Peer LDP Id        Adj Type   State         Msg Sent  Msg Recv  Up Time        
------------------------------------------------------------------------------
192.0.2.3:0        Targeted   Established   331       332       0d 00:29:46  
192.0.2.7:0        Link       Established   1253      1255      0d 00:57:44  
------------------------------------------------------------------------------
No. of Sessions: 2
==============================================================================
 
 
 
*A:PE-5# show router route-table 
===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix                                   Type    Proto    Age         Pref
       Next Hop[Interface Name]                                     Metric     
-------------------------------------------------------------------------------
192.0.2.1/32                                  Remote  BGP      00h42m30s   170 
       192.0.2.7 (tunneled)                                         0
192.0.2.3/32                                  Remote  BGP      00h42m30s   170 
       192.0.2.7 (tunneled)                                         0
192.0.2.5/32                                  Local   Local    00h58m27s   0   
       system                                                       0
192.0.2.7/32                                  Remote  ISIS     00h56m41s   15  
       192.168.3.2                                                  10
192.168.3.0/30                                Local   Local    00h57m28s   0   
       int-PE5-PE7                                                  0
-------------------------------------------------------------------------------
No. of Routes: 5
===============================================================================
 
 
*A:PE-5# show router tunnel-table 
===============================================================================
Tunnel Table (Router: Base)
===============================================================================
Destination        Owner Encap TunnelId  Pref     Nexthop        Metric        
-------------------------------------------------------------------------------
192.0.2.1/32       bgp   MPLS   -        10       192.0.2.7      1000          
192.0.2.3/32       sdp   MPLS  53        5        192.0.2.3      0             
192.0.2.3/32       bgp   MPLS   -        10       192.0.2.7      1000          
192.0.2.7/32       ldp   MPLS   -        9        192.168.3.2    10            
===============================================================================
*A:PE-5#
 
 
*A:PE-5# show service id 1 base 
===============================================================================
Service Basic Information
===============================================================================
Service Id        : 1                   Vpn Id            : 0
Service Type      : Epipe               
Name              : (Not Specified)
Description       : Tunnel to PE-3
Customer Id       : 1                   
Last Status Change: 09/03/2011 17:23:22 
Last Mgmt Change  : 09/03/2011 17:23:22 
Admin State       : Up                  Oper State        : Up
MTU               : 1514                
Vc Switching      : False               
SAP Count         : 1                   SDP Bind Count    : 1
Per Svc Hashing   : Disabled            
Force QTag Fwd    : Disabled 
-------------------------------------------------------------------------------
Service Access & Destination Points
-------------------------------------------------------------------------------
Identifier                               Type         AdmMTU  OprMTU  Adm  Opr 
-------------------------------------------------------------------------------
sap:1/1/3:1                              q-tag        1518    1518    Up   Up  
sdp:53:1 S(192.0.2.3)                    Spok         0       1552    Up   Up  
===============================================================================
 
*A:PE-5# ping 192.0.2.3 
PING 192.0.2.3 56 data bytes
64 bytes from 192.0.2.3: icmp_seq=1 ttl=64 time=3.45ms.
64 bytes from 192.0.2.3: icmp_seq=2 ttl=64 time=3.74ms.
64 bytes from 192.0.2.3: icmp_seq=3 ttl=64 time=4.40ms.
64 bytes from 192.0.2.3: icmp_seq=4 ttl=64 time=3.85ms.
64 bytes from 192.0.2.3: icmp_seq=5 ttl=64 time=4.93ms.
 
---- 192.0.2.3 PING Statistics ----
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min = 3.45ms, avg = 4.07ms, max = 4.93ms, stddev = 0.530ms
 
On PE-5, the BGP route to the system IP address of PE-3 can been seen with a next hop of PE-7:
*A:PE-5# show router bgp routes 
===============================================================================
 BGP Router ID:192.0.2.5        AS:64502       Local AS:64502      
===============================================================================
 Legend -
 Status codes  : u - used, s - suppressed, h - history, d - decayed, * - valid
 Origin codes  : i - IGP, e - EGP, ? - incomplete, > - best
===============================================================================
BGP IPv4 Routes
===============================================================================
Flag  Network                                            LocalPref   MED       
      Nexthop                                                        VPNLabel  
      As-Path                                                                  
-------------------------------------------------------------------------------
u*>i  192.0.2.1/32                                       100         None      
      192.0.2.7                                                      -         
      64501 64500                                                              
u*>i  192.0.2.3/32                                       100         None      
      192.0.2.7                                                      -         
      64501 64500                                                              
*i    192.0.2.5/32                                       100         10        
      192.0.2.7                                                      -         
      No As-Path                                                               
*i    192.0.2.7/32                                       100         None      
      192.0.2.7                                                      -         
      No As-Path                                                               
-------------------------------------------------------------------------------
Routes : 4
===============================================================================
 
 
Again on PE-5, the FIB on slot 1 shows that the system IP address of PE-3 is reachable using BGP over an LDP transport to PE-7:
*A:PE-5# show router fib 1 
===============================================================================
FIB Display
===============================================================================
Prefix                                                      Protocol           
    NextHop                                                                    
-------------------------------------------------------------------------------
192.0.2.1/32                                                BGP                
    192.0.2.7 (Transport:LDP)
192.0.2.3/32                                                BGP                
    192.0.2.7 (Transport:LDP)
192.0.2.5/32                                                LOCAL              
    192.0.2.5 (system) 
192.0.2.7/32                                                ISIS               
    192.168.3.2 (int-PE5-PE7) 
192.168.3.0/30                                              LOCAL              
    192.168.3.0 (int-PE5-PE7) 
-------------------------------------------------------------------------------
Total Entries : 5
-------------------------------------------------------------------------------
===============================================================================
 
The show commands on PE-9 router in AS 64501 are as follows:
*A:PE-9# show router bgp summary 
===============================================================================
 BGP Router ID:192.0.2.9        AS:64501       Local AS:64501      
===============================================================================
BGP Admin State         : Up          BGP Oper State              : Up
Total Peer Groups       : 1           Total Peers                 : 2         
Total BGP Paths         : 6           Total Path Memory           : 752       
Total IPv4 Remote Rts   : 4           Total IPv4 Rem. Active Rts  : 4         
Total IPv6 Remote Rts   : 0           Total IPv6 Rem. Active Rts  : 0         
Total Supressed Rts     : 0           Total Hist. Rts             : 0         
Total Decay Rts         : 0         
 
Total VPN Peer Groups   : 0           Total VPN Peers             : 0         
Total VPN Local Rts     : 0         
Total VPN-IPv4 Rem. Rts : 0           Total VPN-IPv4 Rem. Act. Rts: 0         
Total VPN-IPv6 Rem. Rts : 0           Total VPN-IPv6 Rem. Act. Rts: 0         
Total L2-VPN Rem. Rts   : 0           Total L2VPN Rem. Act. Rts   : 0         
Total VPN Supp. Rts     : 0           Total VPN Hist. Rts         : 0         
Total VPN Decay Rts     : 0         
Total MVPN-IPv4 Rem Rts : 0           Total MVPN-IPv4 Rem Act Rts : 0         
Total MDT-SAFI Rem Rts  : 0           Total MDT-SAFI Rem Act Rts  : 0 
===============================================================================
BGP Summary
===============================================================================
Neighbor
                   AS PktRcvd InQ  Up/Down   State|Rcv/Act/Sent (Addr Family)
                      PktSent OutQ
-------------------------------------------------------------------------------
192.168.1.2
                64500     128    0 01h01m22s 2/2/2 (IPv4)                      
                          132    0                                             
192.168.2.2
                64502     113    0 00h53m31s 2/2/2 (IPv4)                      
                          117    0                                             
===============================================================================
 
 
*A:PE-9# show router bgp routes 
===============================================================================
 BGP Router ID:192.0.2.9        AS:64501       Local AS:64501      
===============================================================================
 Legend -
 Status codes  : u - used, s - suppressed, h - history, d - decayed, * - valid
 Origin codes  : i - IGP, e - EGP, ? - incomplete, > - best
===============================================================================
BGP IPv4 Routes
===============================================================================
Flag  Network                                            LocalPref   MED       
      Nexthop                                                        VPNLabel  
      As-Path                                                                  
-------------------------------------------------------------------------------
u*>i  192.0.2.1/32                                       None        None      
      192.168.1.2                                                    -         
      64500                                                                    
u*>i  192.0.2.3/32                                       None        10        
      192.168.1.2                                                    -         
      64500                                                                    
u*>i  192.0.2.5/32                                       None        10        
      192.168.2.2                                                    -         
      64502                                                                    
u*>i  192.0.2.7/32                                       None        None      
      192.168.2.2                                                    -         
      64502                                                                    
-------------------------------------------------------------------------------
Routes : 4
===============================================================================
 
 
*A:PE-9# show router bgp inter-as-label 
===============================================================================
BGP Inter-AS labels
===============================================================================
NextHop                       Received       Advertised     Label              
                              Label          Label          Origin             
-------------------------------------------------------------------------------
192.168.1.2                   131068         131069         External           
192.168.1.2                   131069         131070         External           
192.168.2.2                   131066         131067         External           
192.168.2.2                   131067         131068         External           
===============================================================================
 
 
*A:PE-9# show router route-table 
===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix                                   Type    Proto    Age         Pref
       Next Hop[Interface Name]                                     Metric     
-------------------------------------------------------------------------------
192.0.2.1/32                                  Remote  BGP      00h35m46s   170 
       192.168.1.2                                                  0
192.0.2.3/32                                  Remote  BGP      00h35m46s   170 
       192.168.1.2                                                  0
192.0.2.5/32                                  Remote  BGP      00h31m56s   170 
       192.168.2.2                                                  0
192.0.2.7/32                                  Remote  BGP      00h31m56s   170 
       192.168.2.2                                                  0
192.0.2.9/32                                  Local   Local    01h08m18s   0   
       system                                                       0
192.168.1.0/30                                Local   Local    01h07m10s   0   
       int-PE-9-PE-1                                                0
192.168.2.0/30                                Local   Local    01h06m27s   0   
       int-PE-9-PE-7                                                0
-------------------------------------------------------------------------------
No. of Routes: 7
===============================================================================
 
The commands on PE-1 are shown below:
*A:PE-1# show router bgp summary 
===============================================================================
 BGP Router ID:192.0.2.1        AS:64500       Local AS:64500      
===============================================================================
BGP Admin State         : Up          BGP Oper State              : Up
Total Peer Groups       : 2           Total Peers                 : 2         
Total BGP Paths         : 5           Total Path Memory           : 612       
Total IPv4 Remote Rts   : 2           Total IPv4 Rem. Active Rts  : 2         
Total IPv6 Remote Rts   : 0           Total IPv6 Rem. Active Rts  : 0         
Total Supressed Rts     : 0           Total Hist. Rts             : 0         
Total Decay Rts         : 0         
 
Total VPN Peer Groups   : 0           Total VPN Peers             : 0         
Total VPN Local Rts     : 0         
Total VPN-IPv4 Rem. Rts : 0           Total VPN-IPv4 Rem. Act. Rts: 0         
Total VPN-IPv6 Rem. Rts : 0           Total VPN-IPv6 Rem. Act. Rts: 0         
Total L2-VPN Rem. Rts   : 0           Total L2VPN Rem. Act. Rts   : 0         
Total VPN Supp. Rts     : 0           Total VPN Hist. Rts         : 0         
Total VPN Decay Rts     : 0         
Total MVPN-IPv4 Rem Rts : 0           Total MVPN-IPv4 Rem Act Rts : 0         
Total MDT-SAFI Rem Rts  : 0           Total MDT-SAFI Rem Act Rts  : 0 
===============================================================================
BGP Summary
===============================================================================
Neighbor
                   AS PktRcvd InQ  Up/Down   State|Rcv/Act/Sent (Addr Family)
                      PktSent OutQ
-------------------------------------------------------------------------------
192.0.2.3
                64500     137    0 01h06m58s 0/0/2 (IPv4)                      
                          138    0                                             
192.168.1.1
                64501     119    0 00h57m29s 2/2/2 (IPv4)                      
                          121    0                                             
===============================================================================
 
 
*A:PE-1# show router bgp inter-as-label 
===============================================================================
BGP Inter-AS labels
===============================================================================
NextHop                       Received       Advertised     Label              
                              Label          Label          Origin             
-------------------------------------------------------------------------------
192.168.1.1                   131067         131067         External           
192.168.1.1                   131068         131066         External           
192.0.2.1                     0              131069         Edge               
192.0.2.3                     0              131068         Internal           
===============================================================================
 
 
*A:PE-1# show router route-table 
===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix                                   Type    Proto    Age         Pref
       Next Hop[Interface Name]                                     Metric     
-------------------------------------------------------------------------------
192.0.2.1/32                                  Local   Local    01h12m22s   0   
       system                                                       0
192.0.2.3/32                                  Remote  ISIS     01h09m14s   15  
       192.168.4.1                                                  10
192.0.2.5/32                                  Remote  BGP      00h27m29s   170 
       192.168.1.1                                                  0
192.0.2.7/32                                  Remote  BGP      00h27m29s   170 
       192.168.1.1                                                  0
192.168.1.0/30                                Local   Local    01h10m05s   0   
       int-PE-3-PE-9                                                0
192.168.4.0/30                                Local   Local    01h11m15s   0   
       int-PE-1-PE-3                                                0
-------------------------------------------------------------------------------
No. of Routes: 6
===============================================================================
 
The show commands on PE-7:
*A:PE-7# show router bgp summary 
===============================================================================
 BGP Router ID:192.0.2.7        AS:64502       Local AS:64502      
===============================================================================
BGP Admin State         : Up          BGP Oper State              : Up
Total Peer Groups       : 2           Total Peers                 : 2         
Total BGP Paths         : 5           Total Path Memory           : 612       
Total IPv4 Remote Rts   : 2           Total IPv4 Rem. Active Rts  : 2         
Total IPv6 Remote Rts   : 0           Total IPv6 Rem. Active Rts  : 0         
Total Supressed Rts     : 0           Total Hist. Rts             : 0         
Total Decay Rts         : 0         
 
Total VPN Peer Groups   : 0           Total VPN Peers             : 0         
Total VPN Local Rts     : 0         
Total VPN-IPv4 Rem. Rts : 0           Total VPN-IPv4 Rem. Act. Rts: 0         
Total VPN-IPv6 Rem. Rts : 0           Total VPN-IPv6 Rem. Act. Rts: 0         
Total L2-VPN Rem. Rts   : 0           Total L2VPN Rem. Act. Rts   : 0         
Total VPN Supp. Rts     : 0           Total VPN Hist. Rts         : 0         
Total VPN Decay Rts     : 0         
Total MVPN-IPv4 Rem Rts : 0           Total MVPN-IPv4 Rem Act Rts : 0         
Total MDT-SAFI Rem Rts  : 0           Total MDT-SAFI Rem Act Rts  : 0         
 
===============================================================================
BGP Summary
===============================================================================
Neighbor
                   AS PktRcvd InQ  Up/Down   State|Rcv/Act/Sent (Addr Family)
                      PktSent OutQ
-------------------------------------------------------------------------------
192.0.2.5
                64502     104    0 00h49m52s 0/0/4 (IPv4)                      
                          108    0                                             
192.168.2.1
                64501     118    0 00h56m44s 2/2/2 (IPv4)                      
                          120    0                                             
===============================================================================
 
 
*A:PE-7# show router bgp routes 
===============================================================================
 BGP Router ID:192.0.2.7        AS:64502       Local AS:64502      
===============================================================================
 Legend -
 Status codes  : u - used, s - suppressed, h - history, d - decayed, * - valid
 Origin codes  : i - IGP, e - EGP, ? - incomplete, > - best
===============================================================================
BGP IPv4 Routes
===============================================================================
Flag  Network                                            LocalPref   MED       
      Nexthop                                                        VPNLabel  
      As-Path                                                                  
-------------------------------------------------------------------------------
u*>i  192.0.2.1/32                                       None        None      
      192.168.2.1                                                    -         
      64501 64500                                                              
u*>i  192.0.2.3/32                                       None        None      
      192.168.2.1                                                    -         
      64501 64500                                                              
-------------------------------------------------------------------------------
Routes : 2
===============================================================================
 
 
*A:PE-7# show router bgp inter-as-label 
===============================================================================
BGP Inter-AS labels
===============================================================================
NextHop                       Received       Advertised     Label              
                              Label          Label          Origin             
-------------------------------------------------------------------------------
192.168.2.1                   131069         131069         External           
192.168.2.1                   131070         131068         External           
192.0.2.5                     0              131066         Internal           
192.0.2.7                     0              131067         Edge               
===============================================================================
 
 
Conclusion
The BGP tunnel based SDP binding is allowed for VLL and VPLS services, including PBB-VPLS in SROS 8.0R4. Using RFC 3107, it is possible to implement inter-AS Model C VLLs.
The examples used in this section illustrates the configuration of VLL Inter-AS for access CE sites. Troubleshooting commands also have been shown so an operator can verify all the procedures.