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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.10, Part Number 78-11603-01 Rev. D0, July 2001
Chapter 23 Configuring BXM Virtual Switch Interface
VSI Master and Slave Redundancy
What Happens When a Slave Is Added
When a new slave is activated in the node, the BCC will send a VSI configuration CommBus (internal
BPX protocol) message with the list of the controllers attached to the switch.
The BCC will also set up a master-slave connection from each controller port in the switch to the added
slave.
What Happens When a Slave is Deleted
When a slave is deactivated in the node, the BCC will tear down the master-slave VCs between each of
the controller ports in the shelf and the slave.
How Resources are Managed
VSI LCNs are used for setting up the following management channels:
• interslave
• master-slave
• intershelf blind channels
Intershelf blind channels are used in cluster configuration for communication between slaves on both
sides of a trunk between two switches in the same cluster node.
The maximum number of slaves in a switch is 12. Therefore, a maximum of 11 LCNs are necessary to
connect a slave to all other slaves in the node.
If a controller is attached to a shelf, master-slave connections are set up between the controller port and
each of the slaves in the shelf.
For each slave that is not directly connected, the master-slave control VC consists of two legs:
• One leg from the VSI master to the backplane, through the directly connected slave
• A second leg from the backplane to the corresponding VSI slave
For the slave that is directly connected to the controller, the master-slave control VC consists of a single
leg between the controller port and the slave. Therefore, 12 LCNs are needed in the directly connected
slave, and 1 LCN in each of the other slaves in the node for each controller attached to the shelf.
These LCNs will be allocated from the Automatic Routing Management pool. This pool is used by
Automatic Routing Management to allocate LCNs for connections and networking channels.
For a given slave the number of VSI management LCNs required from the common pool is:
n X12+m
where:
n is the number of controllers attached to this slave
m is the number of controllers in the switch directly attached to other slaves