Cisco Systems A9014CFD manual Conditions for Switchover, CESoPSN, SAToP, and ATM/IMA, 39-5

Chapter 39 Remote Loop-Free Alternate - Fast Reroute

How to Configure Remote Loop-Free Alternate - Fast Reroute

Figure 39-2		Pseudowire Redundancy Over FRR
PW				PW-AC
	P1	P2
			P3

				PW-SY
P6		P5
			P4
			PE-3
	Active PW
	Standby PW		86
			3611

Conditions for Switchover

•If the primary path to the peer node goes down for active VC, the FRR changes to backup and the VC remains active.

•A VC switchover does not occur unless both primary and backup paths are down for active VC.

•The standby VC does not go down until both primary and backup paths to the standby peer are down.

•A VC switchover occurs when the peer node of the active VC reboots or when the access circuit goes down.

•If the peer node of active VC reboots when the standby VC is in backup state, the VC switchover occurs immediately and the standby VC becomes active.

How to Configure Remote Loop-Free Alternate - Fast Reroute

Note	•	Effective with Cisco IOS Release 15.3(3)S, the Remote LFA-FRR feature is supported on
		CESoPSN, SAToP, and ATM/IMA.
	•	Effective with Cisco IOS Release 15.4(1)S, the Pseudowire Redundancy over FRR feature is
		supported.

This section describes how to configure Remote LFA-FRR feature:

•Configuring Remote LFA-FRR for IS-IS, page 39-6(Required)

•Configuring Remote LFA-FRR for OSPF, page 39-9(Required)

•Configuring Remote LFA-FRR for Ethernet and TDM Pseudowires, page 39-11(Required)

•Verification Examples for Remote LFA-FRR, page 39-27(Optional)

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		39-5