[c-nsp] IBGP route stays stuck

Pasquino Andrea andrea.pasquino at eng.it
Wed Oct 22 02:30:39 EDT 2014


Hello,

This is the scenario:

I have PE1 and PE2 in AS100
PE1 has an EBGP peering with AS200 and receives a certain prefix a.b.c.d with LP=222
The same prefix a.b.c.d is redistributed on PE2 with LP=33 from a floating static route, and serves as a back-up route

Now here's what happens: if for some reason AS200 stops announcing prefix a.b.c.d, then the announcement from PE2 kicks and we are happy (back-up runs fine)

When  AS200 starts again announcing prefix a.b.c.d, then the announcement from PE2 does not get flushed from PE1 and PE2. We have to erase the "ip route vrf blahblah" command and rewrite it

Have you any clues ?

Andrea



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