IP/LDP FRR/LFA and Remote LFA at Nokia (Alcatel-Lucent) SR OS and Cisco IOS XR

Anton Karneliuk. IT & Network Expert / Architect / Manager; Project Manager; Entrepreneur; 2x CCIE (RS/SP) #49412; MSc Telecommunications.

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  1. Hi Anton,
    Thank you for your detailed explanation on topic. I have also focused on the same topic for a while. I have completed all of my LFA test with success. But not same result for remote-LFA. Is that possible can you please share your test results to see the convergence time of remote-LFA?
    On my setup; I have created a ring topology and performed all of required config for remote-lfa. When I check the route-table, I may able to see my repair tunnel (RSVP LSP tunnel) as below; Remote ISIS 00h52m14s 18 10 (LFA) (tunneled:RSVP:3) 50

    And I have started a rapid ping from this node to another node which on the ring. While rapid ping packets are going, I shutdowned one of interface on the node to see the convergence time of remote-LFA. But on VSR, the convergence time is apprx. 1,1 sec. (110 packet lost on rapid ping). Can you please also share your test results? I guess I am missing one point. 🙂

    Thanks in advance,

    1. Hi Burak,
      I haven’t done tests to check the convergence speed, as it makes no sense in my case: IOS XR doesn’t support BFD, what is must if we want to reach the low convergence time. Also isis timers should be tuned to lower the event response time. Hope this helps.

    1. Hi Joel,
      You are absolutely right. I mention in the article Cisco IOS XRv, it’s important. The XRv doesn’t have a lot of data plane functions, and BFD doesn’t work there as well. On the real HW, as you said, BFD is working just fine.

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