VLNC40/42/42B resource guidelines

Overview

The VLNC40/42/42B circuit pack uses programmable masks and rules in order to recognize and manipulate packets. However, there are a limited number of masks and rules in the hardware.

Rules and masks

Each rule is associated with one mask. Each mask can be associated with one or more rules. Deinstalling and reinstalling masks and rules can cause features to be temporarily disabled/broken, and this can include all features which use masks and rules, not just the one for which the hardware is being changed.

Shared blocks

For shared blocks, it is possible for ports which are configured for the same functionality to share masks and rules. However, slight changes in the provisioning can make sharing impossible. Masks are generally sharable; rules may or may not be.

The shared blocks are shared across the following ports:

• block 1:

  • VLIU1: ports 9–16

  • VLIU2: ports 41–48

• block 2:

  • VLIU1: ports 17–24

  • VLIU2: ports 49–56

• block 3:

  • VLIU1: ports 25–28

  • VLIU2: ports 57–60

Table 5-74: Resource usage

Feature	Masks 1		Rules 2
	Backplane (shared blocks)	Faceplate	Backplane (shared blocks)	Faceplate
basic system functions	6	6	6	6
DiffServ 3	1 per class	1 per class	1 per class	1 per class
Access Control List (ACLs) 4	1 per rule	1 per rule	1 per rule	1 per rule
Link OAM Loopback local 5	1	1	1	1
Link OAM Loopback remote 6	1	1	1	1
Ethernet Ring Protection (ERP)	NA	1 per ERP port	NA	1 per ERP port
Service Multiplexing 7	max 3	max 4	6 plus 1 per mapping 8 plus 1 per shared block for serv-mult UNI to non-serv-mult UNI (VLAN participation include same VLAN) on different shared blocks	6 plus 1 per mapping on each NNI participating in pvid and svlan
Service OAM initial 9	1	1	25 single-tagging mode 41 double-tagging mode 10	18 single-tagging mode 34 double-tagging mode 10
Service OAM MEPs	0	0	1 per port per down MEP 1 max, if there are any up MEPs	1 per down MEP 1 per up MEP

Notes:

1. The total number of available masks per backplane shared block is 16. The total number of available masks on each faceplate port is 16.

2. The total number of available masks per backplane shared block is 256. The total number of available masks on each faceplate port is 128.

3. Limits are: 25 classes system-wide; 10 classes per policy; 1 policy per port. Masks/rules may be reused across policies, but not within policies. The pack supports a maximum of 10 rules per faceplate port and 80 rules per shared block.

4. Limits are: 100 ACLs system-wide; 8 rules per list; 1 list per port. Masks/rules may be reused across ACLs, but not within ACLs. The pack supports a maximum of 8 rules per faceplate port and 64 rules per shared block.

5. Allocated when linkoam enable is issued for a port. Mask and rule are shared across all shared block ports with linkoam enabled.

6. Allocated when linkoam loopback-capability enable is issued for a port. Mask and rule are shared across all shared block ports with linkoam enabled.

7. The maximum number of masks, plus the initial rules are added as soon as any UNI port is set to enable service multiplexing, and at least one mapping and associated VLAN participation has been added. Additional rules are then added/removed whenever a mapping is added/removed, or when VLAN participation changes. Note that the special case of CVLAN "0" uses 2 rules. Masks are always shared across all of each of the shared blocks. Wherever possible, rules are reused within a shared group. For example, if two service-multiplexed ports within a group have the same mapping, then they share a rule.

8. A single mapping is created each time the map <cvlan><svlan> command is used. A mapping applies to a single service-multiplexed UNI port.

9. Allocated when ethoam cfm is enabled. The mask is also used for up and down MEPs.

10. The shelf is double-tagging if any port is set to mode dvlan-tunnel enabled.