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Forum Replies

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

  2. 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

  3. Hello Staut

    Remember that OSPF is a link state routing protocol. One of the characteristics of a link state protocol is that it has a full picture of the network’s topology, including costs of particular links. This information is enough for a router, when node protection as a tie breaker is enabled, to know what the next hop of another router will be to reach a particular destination. If that next hop is the same as the primary next hop for the particular destination, then the node protection tie breaker kicks in and chooses another route as the repair rout

    ... Continue reading in our forum

  4. Many thanks! I forgot that OSPF keeps the topology table besides the routing table.

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