4000 Router Series MPLS Configuration Guide

Reoptimization : Disabled Reoptimization Freq : -

Backup Type : None Backup LSP ID : -

Auto Bandwidth : Disabled Auto Bandwidth Freq : -

Min Bandwidth : - Max Bandwidth : -

Collected Bandwidth : -

NOTE:

If you execute the display mpls te tunnel-interface command immediately after an FRR, you can see two

CRLSPs in up state. This is because FRR uses the make-before-break mechanism to set up a new LSP, and

the old LSP is deleted after the new one has been established for a while.

# Execute the display mpls lsp command on Router B. The output shows that the bypass tunnel is in use.

[RouterB] display mpls lsp

FEC Proto In/Out Label Interface/Out NHLFE

1.1.1.1/4/18753 RSVP 1122/3 Tun5

2.2.2.2/5/40312 RSVP -/1150 GE0/1/4

3.2.1.2 Local -/- GE0/1/4

# On the PLR, configure the interval for selecting an optimal bypass tunnel as 5 seconds.

[RouterB] rsvp

[RouterB-rsvp] fast-reroute timer 5

[RouterB-rsvp] quit

# On the PLR, bring up the protected interface Ethernet 1/2.

[RouterB] interface ethernet 1/2

[RouterB-Ethernet1/2] undo shutdown

[RouterB-Ethernet1/2] quit

# On Router A, execute the display interface tunnel 4 command to display information about the primary

CRLSP. You can see that the tunnel interface is in up state.

# Wait for about 5 seconds, execute the display mpls lsp verbose command on Router B. You can see

that Tunnel5 is bound to interface Ethernet 1/2 but not in use.

# Execute the display ip routing-table command on Router A. You can see a static route entry with

interface Tunnel4 as the egress interface.