How Port Group Enters The Channel Assignment Picture; Cnfrsrc Fails With "Available Channels Is 0 - Cisco BPX 8620 Installation And Configuration Manual

Chapter 28 Troubleshooting

How Port Group Enters the Channel Assignment Picture

The dsplogcd command is for service level users and above. You must have "service" level privileges to
use it.
There are some models of BXM cards that will support more than one port group. The commands
dsplogcd and dspcd will indicate the number of port groups supported. Even though each card supports
x channels, there is a hardware limitation of how many channels can be supported between certain ports.
A set of ports are grouped into port groups; that is, a BXM 8-port OC-3 card has two port groups,
consisting of ports 1–4, and 5–8 respectively. Each port group will have an upper limit of the number of
channels it can support, typically.
(num_chans / num_of_port_groups).

cnfrsrc Fails with "Available Channels is 0"

When the user thinks that there are channels available, but the cnfrsrc command says that the number
of available channels is 0. The user will not be able to allocate any more VSI channels.
This might not be a problem because the user might not have accounted for hidden channel assignments
like networking and VSI VCs. Execute the dspchuse command to see where all the channels are
allocated. Note any channel assignment that looks suspicious. Verify this page with the channels
configured from the cnftrk and cnfrsrc commands.
The dspchuse command is available to users in this release.
Workarounds: The workaround depends on where the problem is. If the problem is with PVCs, try the
cnfrsrc command and change the number of pvcs. Since switchcc will rebuild the channel database, try
executing switchcc.
The following are the things that should be done:
•
•
•
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Capture the dspchuse screen and compare against the cnfrsrc and cnftrk commands.
Verify the number of trunks that are upped. This will indicate the number of networking channels
assigned.
Note the number of VSI shelves added. For each VSI shelf added, 12 LCNs are reserved on the BXM
attached to the controller and 1 LCN is reserved for all the other active BXM cards. Capture the
dspvsich command. For example:
slot 13:
–
2 vsi shelf added
–
slot 11:
–
1 vsi shelf added
–
– slot 9:
Two (2) trunks are upped
–
One (1) port is upped
–
On slot 13 – 25 lcns are reserved => 12 for each vsi shelf, and 1 for the shelf added to slot 11.
–
On slot 11 – 14 lcns are reserved => 12 for the vsi shelf, and 2 for the 2 shelves added on slot 13.
–
On slot 9 – 3 lcns are reserved => 2 for the 2 shelves added on slot 13, and 1 for the 1 shelf
–
added on slot 11.
Cisco BPX 8600 Series Installation and Configuration
Troubleshooting VSI Problems
28-19