Table of Contents
Chapter 1
The BPX Switch: Functional Overview
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Cost-Based Automatic Routing Management Commands
You use these switch software Command Line Interface (CLI) commands for cost-based route selection
as described in Table 1-3. For detailed information about the use of BPX switch commands, refer to the
Cisco WAN Switching Command Reference.
Table 1-3
Commands Used for Cost-Based Route Selection
Name
Description
cnfcmparm
Enables cost-based route selection. This is a SuperUser command to configure all Automatic Routing
Management parameters. By default cost-based route selection is disabled. Enabling or disabling cost-based
route selection can be done at any time. Each connection routing cycle uses whichever algorithm is enabled
when the cycle begins. The configuration is node-based, not network-based, which allows each node to have
its own route selection algorithm.
Enabling cost-based route selection automatically enables cache usage. Disabling cost-based route selection
automatically disables cache usage. Cache usage may also be independently enabled or disabled.
cnftrk
Configures the administrative cost for a trunk. Both physical and virtual trunks have the cost attribute. Each
trunk has a cost ranging from 1 (lowest) to 50 (highest). The default cost is 10 upon trunk activation.
The cost can be configured from either end of the trunk. The cost can be changed before or after the trunk has
been added to the network. The cost can also be changed after connections have been routed over the trunk.
Any cost change is updated network-wide. Every node in the network stores the cost of every trunk in the
network. This knowledge is required for successful source-based routing.
cnfrtcost
Configures the cost cap for a connection. This command is valid only at the node where the connection is
added.
cnfsysparm
Configures the delay cost cap for all delay sensitive connections in the network.
dspcon
Displays the maximum and current costs for a connection route.
dspload
Displays the administrative cost and queue delay for a network trunk.
dsprts
Displays the current costs for all connection routes.
dsptrkcnf
Displays the configured cost of a trunk.
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
below the current route cost, the connection is not automatically rerouted. A manual reroute is
required to route the connection to fit under the new cost cap. This gives you more control over the
connection reroute outage.
Hop-Based Route Selection—Specifies that Automatic Routing Management is used in the
hop-based route selection. The cost of all trunks is set to the default cost (10). The cost cap of all
connections is set to the maximum allowable cost (100). All other new cost-based routing
parameters are set to regular default values.
Automatic Routing Management Interoperability—Because Automatic Routing Management is
source-based, nodes can interoperate using different route selection algorithms. The originating
node computes the full end-to-end route based on its own knowledge of the network topology. The
route is then passed to the subsequent nodes on the route. Source routing allows a mix of Cost-Based
and Hop-Based Route Selection to run in a network.
Cisco BPX 8600 Series Installation and Configuration
Switch Software Description
1-33
Table of Contents
Troubleshooting
