How Background Redundancy Channels Are Allocated; How Ip Channels Are Allocated; How Ilmi/Lmi Channels Are Allocated; How Ilmi Channels Are Allocated For Vsi Partitions On Trunk Interfaces - Cisco BPX 8620 Installation And Configuration Manual

Troubleshooting VSI Problems
For portgroup 2:
sum_of_min = 4000; max_of_max = 5000
Therefore, the number of channels allocated for VSI is 8000.

How Background Redundancy Channels Are Allocated

The formula for getting the LCN is num_chans + 1. The channels are used for Y-redundancy cards to
communicate with each other.

How IP Channels Are Allocated

IP channels are used for ALL5 messaging. The LCNs are reserved within switch software. The formula
for getting the LCN is num_chans + 14 + port (0 based). Twelve LCNs are reserved for IP channels, one
for each port.

How ILMI/LMI Channels Are Allocated

The formula for getting the LCN is num_chans + 2 + port.

How ILMI Channels Are Allocated for VSI Partitions on Trunk Interfaces

When ILMI functionality is enabled for a VSI partition on a trunk interface, a new ILMI session is started
on the BXM card for the trunk interface. The LCN for this session is allocated from the LCNs available
for the Automatic Routing Management partition. This LCN is allocated from the port-based pool; not
from the card-based pool.
Note that no new LCN is allocated when ILMI functionality is enabled for VSI partitions on port
interfaces. This is because the ILMI functionality for VSI partitions on port interfaces use the same ILMI
functionality that is started for Automatic Routing Management. These use the preallocated LCN as
discussed in the preceding section.

How VSI Channels Are Assigned for Interslave VCs

Interslave VCs are assigned with LCNs that are reserved within switch software. These LCNs are not
taken from the pool. The formula for getting the LCN is num_chans + 26 + dest_slot where num_chans
is the number of channels the card supports

mc_vsi_end_lcn

This value is shown in the dsplogcd command. If the value is 0, then there are no VSI channels
configured on the card. If it is not zero, then there are VSI channels. It marks the first VSI channel.

num chans

This value is shown in the dsplogcd command as "Physical Chans." It is reported to switch software
from the card. Each BXM will vary in the number of channels that it supports.
Cisco BPX 8600 Series Installation and Configuration
28-18
Chapter 28
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Troubleshooting