9-12 Cisco BPX 8600 Series Reference
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
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.
BXM Card
Type
Number of
Port
Groups
Port Group
Size
LCN Limit
per Port
Group
Average
Connections
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
