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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 28 Troubleshooting
Troubleshooting VSI Problems
For portgroup 1:
sum_of_min = 3000; max_of_max = 1000
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. These 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 AutoRoute 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 AutoRoute. These use the pre-allocated 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.