Cisco Systems 8600 Series manual Configuring VSI Lcns

Tag Switching Resource Configuration Parameters

Configuring VSI LCNS

In the first release of tag switching, each BXM card supports 16k connections in total, including PVCs, tag switching VSI connections, and connections used for internal signaling.

On the BXM, the ports are grouped into port groups, and a certain number of connections is available to each port group. For example, an 8-port-OC3 BXM has two port groups, consisting of ports 1-4 and 5-8, respectively.

Each port group for the various versions of the BXM cards has a separate connection pool as specified in Table 9-1.

Table 9-1	BXM Port Groups
	Number of		LCN Limit	Average
BXM Card	Port	Port Group	per Port	Connections
Type	Groups	Size	Group	per Port
8–T3/E3	1	8 ports	16k	2048
12–T3/E3	1	12 ports	16k	1365
4–OC3	2	2 ports	8k	4096
8–OC3	2	4 ports	8k	2048
1–OC12	1	1 port	16k	16384
2–OC12	2	1 port	8k	8192

For tag switching, connections are allocated to VSI partitions. On the BPX 8650, for Release 9.1, only one VSI partition is used. In the future, other VSI partitions may be used to support controllers other than the Tag Switch Controller (e.g., 7200 and 7500 series routers). Also, currently there is only one VSI partition per port, but in the future multiple VSI partitions may be assigned to a given port.

When configuring connection partitioning for a BXM card, with one VSI partition per port, a number of connection spaces (LCNs) are assigned to each port as listed in Table 9-2.The cnfrsrc command is used to configure partition resources.

Note When the configuring the port using the cnfrsrc command, the term LCN is used in place of connection.

9-12Cisco BPX 8600 Series Reference