Tag Switching 9-37
cnfrsrc
minvsilcns The minimum number of LCNs guaranteed for this partition. The VSI controller
guarantees at least this many connection endpoints in the partition, provided that
there are sufficient free LCNs in the common pool to satisfy the request at the time
the partition is added. When a new partition is added or the value is increased, it
may be that existing connections have depleted the common pool so that there are
not enough free LCNs to satisfy the request. The BXM gives priority to the request
when LCNs are freed. The net effect is that the partition may not receive all the
guaranteed LCNs (min LCNs) until other LCNs are returned to the common pool.
This value may not be decreased dynamically. All partitions in the same port group
must be deleted first and reconfigured in order to reduce this value.
The value may be increased dynamically. However, this may cause the “deficit”
condition described above.
The command line interface warns the user when the action is invalid, except for the
“deficit” condition.
To avoid this deficit condition which could occur with maximum LCN usage by a
partition or partitions, it is recommended that all partitions be configured ahead of
time before adding connections. Also, it is recommended that all partitions be
configured before adding a VSI controller via the addshelf command.
maxvsilcns The total number of LCNs the partition is allowed for setting up connections. The
min LCNs is included in this calculation. If max LCNs equals min LCNs, then the
max LCNs are guaranteed for the partition.
Otherwise, (max - min) LCNs are allocated from the common pool on a FIFO basis.
If the common pool is exhausted, new connection setup requests will be rejected
for the partition, even though the max LCNs has not been reached.
This value may be increased dynamically when there are enough unallocated LCNs
in the port group to satisfy the increase.
The value may not be decreased dynamically. All partitions in the same port group
must be deleted first and reconfigured in order to reduce this value.
Different types of BXM cards support different maximums. If you enter a value
greater than the allowed maximum, a message is displayed with the allowable
maximum.
vsistartvpi
By default the TSC (e.g, 7200 or 7500 series router) will use either a starting VSI
VPI of 1 or 2 for tag switching, whichever is available. If both are available, a
starting VSI VPI of 1 is used. The VPI range should be 2-15 on a BPX 8620 VSI.
The VSI range for tag switching on the BPX 8620 is configured as a VSI partition,
usually VSI partition number 1. VSI VPI 1 is reserved for AutoRoute PVCs, so the
VSI partition for tag switching should start at VPI 2. If VPI 2 is not to be used, the
tag switching VPI interface configuration command can be used on the TSC to
override the defaults
vsiendvpi Two VPIs are sufficient for the current release, although it may be advisable to
reserve a larger range of VPIs for later expansion, for example, VPIs 2-15.
vsiminbw The minimum port bandwidth allocated to this partition in cells/sec. (Multiply by
400 based on 55 bytes per ATM cell to get approximate bits/sec.)
vsimaxbw The maximum port bandwidth allocated to this partition. This value is used for VSI
QBIN bandwidth scaling.
Parameter (cnfrsrc) Description
