25 Sep
2000
25 Sep
'00
6:26 a.m.
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. Bradley