Configuring Shortest Path and Topology Discovery
Configuring Shortest Path and Topology Discovery
To enable and configure shortest path and topology discovery, perform the following procedure,
beginning in global configuration mode:
Command
Step 1
Router# interface spr1
Step 2
Router(config-if)# spr topology discovery
Step 3
Router(config-if)# spr load-balance
shortest-hop
Step 4
Router(config-if)# no shutdown
Step 5
Router(config)# end
Step 6
Router# copy running-config startup-config
Monitoring and Verifying Topology Discovery and Shortest Path Load
Balancing
After configuring topology discovery, you can monitor the status using the global command show spr
topology 1 to display the Cisco proprietary RPR topology information.
output of this commands.
Example 17-9 Output of show spr topology command
Router> show spr topology 1
***** ML-RPR Topology Map **************
Local Station Topology Info
Node Id : 40
West Span
East Span
Ring Topology: OPEN (UNSTABLE)
Advertised Protection requests:
ringlet0: IDLEringlet1: IDLE
Active Edges:
=======================================================================
1. Topology Instability
Hops (POS 0)
Hops (POS 1)
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
17-36
neighbor : 0
neighbor : 0
ringlet0: NO ringlet1: NO
Sequence Number: 0
East Interface: POS1
Number of nodes on east: 2
Number of nodes on west: 2
Active Topology Defects:
Node Id
4
6
Node Id
2
6
Chapter 17 Configuring Cisco Proprietary Resilient Packet Ring
Purpose
Activates interface configuration mode to
configure the POS interface.
Enables topology discovery on Cisco proprietary
RPR.
Configures shortest path load-balancing for
Layer 2 unicast packets being added to the ring.
Enables the interface by preventing it from
shutting down.
Returns to privileged EXEC mode.
(Optional) Saves configuration changes to the
TCC2/TCC2P flash database.
West Interface: POS0
Edge W/E
Request W/E
20
NO/NO
40
NO/NO
Edge W/E
Request W/E
20
NO/NO
40
NO/NO
Example 17-9
IDLE/IDLE
IDLE/IDLE
IDLE/IDLE
IDLE/IDLE
illustrates the