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Forum Replies

  1. Hello,
    The Cisco documentation states the below regarding the High and Low options:
    Low priority specifies that all prefixes have the same eligibility for protection. High priority specifies that only high-priority prefixes are protected.
    You have mentioned above that OSPF treats loopback and /32 prefixes with higher priority, calculating an LFA for these a bit earlier than other prefixes which contradicts the Cisco documentation.
    I am a little confused :roll_eyes: Regards,
    Kamal

  2. The subnets shown on the network topologies for this lesson are not correct.

  3. Hi Kamal,

    It is confusing indeed. In these two documents:

    http://www.massimilianosbaraglia.it/documenti/engineering/routing/cisco/LFA%20fast%20reroute.pdf

    https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/200225-Configure-Loop-Free-Alternate-path-with.html#anc17

    They explain that high priority prefixes get programmed before low priority prefixes. A high priority prefix is a /32 prefix.

    In this document:

    https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro-15-sy-book/iro-lfa-frr.pdf

    They state:

    Low priority specifies t

    ... Continue reading in our forum

  4. i solved it
    IOSv doesnt support
    IOS XE Release 3S support
    i changed the router
    now i use CSR1000v

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