Configuring Explicit Paths - Cisco Catalyst 8540 MSR Configuration Manual

Advanced PNNI Configuration

Configuring Explicit Paths

The explicit path feature enables you to manually configure either a fully specified or partially specified
path for routing soft permanent virtual channels (soft PVC) and soft permanent virtual path (soft PVP)
connections. Once these routes are configured, up to three explicit paths might be applied to these
connections.
A fully specified path includes all adjacent nodes (and optionally the corresponding exit port) for all
segments of the path. A partially specified path consists of one or more segment target nodes that should
appear in their proper order in the explicit path. The standard routing algorithm is used to determine all
unspecified parts of the partially specified path.
You can specify a path name for an explicit path and the switch assigns the next available unused path-id
value, or you can choose the path-id value and assign or modify its name.
To configure an explicit path on a circuit emulation services (CES) VC, see the section
Explicit Paths on CES VCs, page
To enter the PNNI explicit path configuration mode, use the following global configuration command:
Command
atm pnni explicit-path {identifier
path-id-number [name path-name] | name
path-name} [enable | disable]
The disable option can be used to prevent an explicit path from being used for routing while it is being
configured, if any soft connections already reference it. If the explicit path has not been created, the
initial default is to enable the explicit path upon configuration.
Example
The following example shows how to enter the PNNI explicit path configuration mode for a path named
boston_2.path1:
Switch(config)# atm pnni explicit-path name boston_2.path1
Switch(cfg-pnni-expl-path)#
Adding Entries to the Explicit Path
Once in PNNI explicit path configuration mode, you can use the following subcommands repeatedly to
build up the ordered list that specifies the explicit path:
Command
next-node {name-string | node-id |
node-id-prefix} [port hex-port-id | agg-token
hex-agg-token-id]
segment-target {name-string | node-id |
node-id-prefix} [port hex-port-id | agg-token
hex-agg-token-id]
exclude-node {name-string | node-id |
node-id-prefix} [port hex-port-id | agg-token
hex-agg-token-id]
ATM Switch Router Software Configuration Guide
11-36
19-61.
Purpose
Enters the PNNI explicit path configuration
mode.
Purpose
The next-node keyword specifies the next
adjacent node for fully specified paths. Add next
PNNI explicit path entry with this command.
The segment-target keyword specifies the target
node for cases where the path through
intermediate nodes should be automatically
routed.
The exclude-node keyword specifies nodes or
ports that are excluded from all partial path
segments.
Chapter 11 Configuring ATM Routing and PNNI
Configuring
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