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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter39 Remote Loop-Free Alternate - Fast Reroute
How to Configure Remote Loop-Free Alternate - Fast Reroute
18. passive-interface interface-type interface-number
19. mpls ldp sync
DETAILED STEPS
Command Purpose
Step 1
enable
Example:
Router> enable
Enables privileged EXEC mode.
• Enter your password if prompted.
Step 2
configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
router isis
Example:
Router(config)# router isis
Enables the IS-IS routing protocol and enters the router
configuration mode.
Step 4
net
net
Example:
Router(config-router)# net
49.0001.0002.0001.0001.00
Configures an IS-IS network entity table (NET) for the routing
process.
Step 5
is-type level-1
Example:
Router(config-router)# is-type level-1
Configures the routing level for an instance of the IS-IS routing
process.
• level-1—Router performs only Level 1 (intra-area) routing.
This router learns only about destinations inside its area.
Step 6
advertise-passive-only
Example:
Router(config-router)#
advertise-passive-only
Configures IS-IS to advertise only prefixes that belong to passive
interfaces.
Step 7
ispf level-1
Example:
Router(config-router)# ispf level-1
Enables incremental shortest path first (SPF).
• level-1—Enables incremental SPF for Level 1 packets only.
The level-1 keyword applies only after enabling IS-IS.
Note When IS-IS incremental SPF is configured on a ring
topology, high convergence numbers are observed for
random global prefixes. See CSCue11410 for details.
Step 8
fast-flood
Example:
Router(config-router)# fast-flood
Fills IS-IS link-state packets (LSPs).