MPLS FRR link switchover time

[sajanpainel]

Hi all,

As in the attached diagram at Router A, Traffic from Network 1 to Network 2  is taking path A-D. But in case of the failure on A-D link, Traffic must switchover to path A-B-D. A,B and D are the Cisco 7606 and actiing as MPLS P routers. Traffic engineering tunnels are UP between Network 1 & 2.

OSPF is the IGP runnung.

how can we test how much time the router (A) took to switch between paths, from (1/1) to (2/1) in milli seconds ?

[Mahesh Gohil]

Hi,

Not sure but you should rely on logs

like

Apr 25 21:11:26.155 UTC: %MPLS_TE-5-TUN: Tun228: LSP path change............................

Regards # Mahesh

[Giuseppe Larosa]

Hello Sajan,

in addition to looking to the log timestamps as suggested by Mahesh, if this a testing lab scenario and you have a traffic generator instrument, you could send traffic from network1 to network2 doing a frame loss test.

Given a constant TX packet rate (i.e. for example  1000 packets/s) the number of packets lost during TE FRR switchover will give you a measure of network convergence time from the point of view of user traffic,

This would be a meaningful test.

Hope to help

Giuseppe

[sajanpainel]

HI Larosa,

This seems to be very good idea. I will testing this within this week and update.. Meanwhile please post any other idea pops out.

Regards

Sajan John