Specifications

5-20
Cisco ATM Services (AXSM) Configuration Guide and Command Reference for MGX Switches
Release 5.2, Part Number OL-6484-01 Rev. C0, September 2005
Chapter 5 AXSM Command Reference
addcon
-mc Maximum cost (maxcost): a value that creates a priority for the connection route. The
switch can select a route if the cost does not exceed maxcost. The range for maxcost
is 0–4294967295. If you do not specify maxcost, the connection has the highest
routing priority by default. Therefore, the maxcost parameter lets you lower the
routing priority of a connection. Note the following effects of values in the maxcost
range:
• To assign the highest priority to an SPVC based on cost (any path is acceptable),
use the default of 4294967295. If you do not specify maxcost, the cost appears
as a –1 in the dspcon output. (You cannot enter a –1 for maxcost in the addcon
command, but display commands generally can show unspecified values as –1.).
• Enter a 0 for optimal (or least expensive) path.
• For any non-zero maxcost, PNNI allows a path if the total cost for all links does
not exceed maxcost.
Although maxcost applies to an individual connection, routing costs substantially
depend on a cost-per-link that you specify at every PNNI logical port in the network.
The applicable PNNI command is cnfpnni-intf.
The cost of a route is as follows: routing cost = sum of all costs-per-link
where:
• The cost-per-link has been specified through cnfpnni-intf at the egress of each
logical port under PNNI control throughout the network. The impact of
cost-per-link is cumulative, not just local.
• Each link has two egress points: one going to the far endpoint, and one in the
return direction. The cost-per-link can differ in each direction, so the switch adds
the cost-per-link in each egress instead multiplying cost by two.
The cost-per-link applies to all connections of a particular service type on a port. For
example, the cost-per-link is the same for all VBR.1 connections that PNNI controls
on a port, and this cost can differ from all UBR.1 connections on the same port.
Alternatively, you can use cnfpnni-intf to make the cost-per-link the same for all
service types.
To illustrate by examining a four-link route:
1. You s p ec i fy a maxcost of 100000.
2. A route under consideration has four links for a total of eight egress points.
3. The cost-per-link at 6 ports is 5040 (the default) and 10000 at 2 ports.
The route is usable because the cost of 50240 is less than the maxcost of 100000.
Default: 4294967295 The default makes maxcost meaningless for the connection, so
PNNI does not use it as a routing metric.
Note To return maxcost to the default, use the cnfcon command with the parameter
-mc 4294967295.
-lputil Local Percentage Utilization. Range 1-100. The default is 100.
-rputil Remote Percentage Utilization. Range 1-100. The default is100.