North American Network Operators Group

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Re: update

  • From: Bradley Dunn
  • Date: Mon Sep 25 06:29:33 2000

On Mon, Sep 25, 2000 at 03:31:53AM -0400, John Fraizer wrote:
> In a BB situation and in some simple multihomed situations, it is possible
> for someone to have a route into your network via an interface that for
> administrative/technical reasons, you're not accepting routes to them via.  
> In such instances, CEF will break an otherwise valid, though be it
> asymetric stream.

You are confusing CEF, a switching path, with 'ip verify unicast reverse-path',
an interface configuration command which requires CEF.

In any case, recent flavours of IOS support using an ACL to specify exceptions
to the reverse-path check.