How QoS works for router-originated traffic
This section describes how QoS applies to traffic that originates on 7730 SXR platforms.
Default forwarding class and profile for router-originated traffic
The marking of system-generated-traffic on 7730 SXR platforms follows egress remarking policies as they are attached to the respective subinterface, using forwarding class and profile values defined in the following table.
LACP and LLDP packets do not have a subinterface context as they are interface-based protocols. As a consequence, the 7730 SXR forwarding path is unable to account for these packets under interface queue statistics, as the statistics object is fetched from the subinterface record.
|
Protocol/Message |
forwarding-class-index |
profile |
resource-priority |
|---|---|---|---|
| IPv4 ARP request/reply | 6 | out | defined by FC rsource priority table |
| ICMPv4 including echo-request1, echo-reply2, dest-unreachable, redirect, time-exceeded, parameter-problem | 0 | in | defined by FC rsource priority table |
| ICMPv4 echo-request with ToS/DSCP override = X |
Look up X in system-generated-traffic-mapping table |
Look up X in system-generated-traffic-mapping table | defined by FC rsource priority table |
| ICMPv4 echo-reply to echo-request with non-zero DSCP X |
Look up X in system-generated-traffic-mapping table |
Look up X in system-generated-traffic-mapping table | defined by FC rsource priority table |
| UDP traceroute | 0 | out | defined by FC rsource priority table |
| IPv6 neighbor solicitation | 6 | out | defined by FC rsource priority table |
| IPv6 neighbor advertisement | 6 | out | defined by FC rsource priority table |
| All other ICMPv6 including dest unreachable, packet-too-big, time-exceeded, parameter-problem, echo-request1, echo-reply2, router-solicitation, redirect | 0 | in | defined by FC rsource priority table |
| ICMPv6 echo-request with DSCP override = X |
Look up X in system-generated-traffic-mapping table |
Look up X in system-generated-traffic-mapping table) | defined by FC rsource priority table |
| ICMPv6 echo-reply to echo-request with non-zero DSCP X |
Look up X in system-generated-traffic-mapping table) |
Look up X in system-generated-traffic-mapping table | defined by FC rsource priority table |
| BFD | 6 | out | defined by FC rsource priority table |
| BGP | 6 | out | defined by FC rsource priority table |
| OSPF | 6 | out | defined by FC rsource priority table |
| DHCP/DHCPv6 | 4 | out | defined by FC rsource priority table |
| DNS query | 4 | out | defined by FC rsource priority table |
| FTP/TFTP | 4 | out | defined by FC rsource priority table |
| gNMI | 4 | out | defined by FC rsource priority table |
| JSON RPC | 4 | out | defined by FC rsource priority table |
| LACP | 6 | out | defined by FC rsource priority table |
| LLDP | 4 | out | defined by FC rsource priority table |
| NTP | 4 | out | defined by FC rsource priority table |
| RADIUS | 4 | out | defined by FC rsource priority table |
| sflow | 0 | out | defined by FC rsource priority table |
| SNMP | 4 | out | defined by FC rsource priority table |
| SSH | 4 | out | defined by FC rsource priority table |
| Syslog | 4 | out | defined by FC rsource priority table |
| TACACS+ | 4 | out | defined by FC rsource priority table |
| IS-IS | 6 | out | defined by FC rsource priority table |
Default DSCP to forwarding class index and profile values
On 7730 SXR platforms, you can specify a DSCP value for ICMP messages. The following table shows the mapping of DSCP to corresponding forwarding class and profile values. This mapping is also available in state using the info from state qos system-generated-traffic command, to determine which DSCP value to use to generate traffic for a given forwarding class and profile combination.
| DSCP value | Forwarding class index | Profile |
|---|---|---|
| 0 | 0 | out |
| 1 | 0 | in |
| 2 | 0 | in-plus |
| 3 | 0 | exceed |
| 4 | 8 | out |
| 5 | 8 | in |
| 6 | 8 | in-plus |
| 7 | 8 | exceed |
| 8 | 1 | out |
| 9 | 13 | out |
| 10 | 2 | in-plus |
| 11 | 13 | in |
| 12 | 2 | in |
| 13 | 13 | in-plus |
| 14 | 2 | out |
| 15 | 2 | exceed |
| 16 | 1 | in |
| 17 | 13 | exceed |
| 18 | 3 | in-plus |
| 19 | 14 | out |
| 20 | 3 | in |
| 21 | 14 | in |
| 22 | 3 | out |
| 23 | 3 | exceed |
| 24 | 1 | in-plus |
| 25 | 14 | in-plus |
| 26 | 4 | in-plus |
| 27 | 14 | exceed |
| 28 | 4 | in |
| 29 | 15 | out |
| 30 | 4 | out |
| 31 | 4 | exceed |
| 32 | 1 | exceed |
| 33 | 15 | in |
| 34 | 5 | in-plus |
| 35 | 15 | in-plus |
| 36 | 5 | in |
| 37 | 12 | out |
| 38 | 5 | out |
| 39 | 5 | exceed |
| 40 | 7 | out |
| 41 | 7 | exceed |
| 42 | 12 | in |
| 43 | 12 | in-plus |
| 44 | 6 | in |
| 45 | 6 | out |
| 46 | 6 | in-plus |
| 47 | 6 | exceed |
| 48 | 7 | in |
| 49 | 7 | in-plus |
| 50 | 9 | out |
| 51 | 9 | in |
| 52 | 9 | in-plus |
| 53 | 9 | exceed |
| 54 | 12 | exceed |
| 55 | 11 | exceed |
| 56 | 7 | in-plus |
| 57 | 10 | out |
| 58 | 10 | in |
| 59 | 10 | in-plus |
| 60 | 10 | exceed |
| 61 | 11 | out |
| 62 | 11 | in |
| 63 | 11 | in-plus |