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Notable Replies

  1. Hi Rene,
    Thx for your very nice article as always :slight_smile:
    If there is multiple Level1-2 Router on a area then due to default Route asymmetric Routing will be occurred. I saw your topic about Route leaking but I think its not scalable more . So is there any other scaleble option here ??

  2. Hi @Zaman.rubd,

    Since IS-IS routers only have a default route to get to other areas, sub-optimal routing can be an issue yes. It will depend on your network design. There's not really an alternative to route leaking as far as I know...somehow you have to get those more specific prefixes in the routing table of your L1 routers.

    For anyone else that is reading this and wondering what this is about, here is an example for IS-IS route leaking and sub-optimal routing:

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