How Networking Channels Are Allocated; How Automatic Routing Management Channels Are Allocated/Configured; How Svc Channels Are Allocated And Configured; How Vsi Channels Are Assigned For Vsi Master To Slave Vcs - Cisco BPX 8620 Installation And Configuration Manual

Chapter 28 Troubleshooting

How Networking Channels Are Allocated

Networking channels are assigned for trunk interfaces only. This includes physical, feeder, and virtual.
Every physical and feeder trunk that is active is assigned 271 networking channels. For virtual trunks,
the first virtual trunk upped on a port is assigned 271 networking channels. Every subsequent one
requires an additional one. So if the second virtual trunk on the same port is upped, one more networking
channel is reserved for that virtual trunk.

How Automatic Routing Management Channels Are Allocated/Configured

When a port or trunk interface is upped, a default value of 256 PVC channels are assigned. You can use
the cnfrsrc command to change this value to fit your needs. Note that this is only the number of PVC
channels configured. Every time a connection is added on the port or trunk interface, a counter is
incremented to keep count of the number of PVCs used. This counter can never exceed the number
configured. For the trunk interface, connections are rerouted if the new value configured is less than the
old value. For the port interface, cnfrsrc will not allow you to decrease the configured value to be less
than the used value. You will need to delete connections before decreasing the PVC value.

How SVC Channels are Allocated and Configured

You can configure the number of SVC channels by using the cnftrk or the cnfport command. SVC and
VSI channels cannot coexist. The command will block you from configuring channels if there are VSI
channels allocated.

How VSI Channels Are Assigned for VSI Master to Slave VCs

When a VSI shelf is added with the addshelf command on the feeder interface, 12 LCNs are reserved
for master-to-slave VCs. The reason for 12 LCNs is that one LCN is needed to communicate to an active
BXM (with VSI functionality). The BPX has 15 slots possible, two of which are used for the BCC and
one used for the ASM card. The worst case is if the BPX has all BXM cards in the node, therefore the
master end point (that is, the card with the VSI shelf added) needs 12 LCNs to communicate with all the
cards on the node. The command dspvsich will display all the LCNs reserved for master to slave VCs
and interslave VCs.

How VSI Channels Are Configured/Allocated

VSI channels are configured through the cnfrsrc command. The user specifies a VSI min and a VSI max
for the partition. The number of channels that is allocated is max (sum_of_min, max_of_max) as shown
in the following example:
port group 1:
port 1:minmax
partition 1: 10001000
port 2:
partition 1:2000 1000
port group 2:
port 3:
partition 1:20005000
port 4:
partition 1:20004000
For portgroup 1:
sum_of_min = 3000;
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
max_of_max = 1000
Cisco BPX 8600 Series Installation and Configuration
Troubleshooting VSI Problems
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