Re: strange csc behaviour// ip expert lab 9

I think I remember a bug that caused this behavior. Something to do with the
lfib and the directly connected network. A label is getting installed when
it shouldn't. Traceroute to r2 and see if you get a loop. if I remember
correctly the ldp session would also flap. Also check the lfib for
peculiarities. I think to fix it I created a label filter for the directly
connected prefix.

On Sep 11, 2010 4:19 PM, "Ovidiu Neghina" <o.neghina_at_gmail.com> wrote:
> Hi
> I am doing lab9 of IP Expert were with we have a CSC scenario
> Troubled topology is simple
> R6------R2
>
> R6 has vrf with mpls ip activated towards R2,
> ospf running between those two routers
> I have direct connectivty between them. OSPF is up and running.
> After I activate mpls ip on the link on both routers I loose direct
> connectivity between them
> I mean ping on directly connected ip address does not work anymore !!!
> OSPF stays up.
> LDP is also fliping a lot:
> I did quite a few of CSC scenarios and this is the first time is
happening.
>
>
> R2(config-subif)#do sh run int ser 4/0.206
> interface Serial4/0.206 point-to-point
> bandwidth 2000
> ip address 123.2.6.2 255.255.255.0
> mpls ldp discovery transport-address interface
> mpls label protocol ldp
> mpls ip
> no cdp enable
> frame-relay interface-dlci 206
> end
>
> R6(config-subif)#do sh run int ser 4/0.602
> interface Serial4/0.602 point-to-point
> bandwidth 2000
> ip vrf forwarding VPNA
> ip address 123.2.6.6 255.255.255.0
> mpls ldp discovery transport-address interface
> mpls label protocol ldp
> mpls ip
> no cdp enable
> frame-relay interface-dlci 602
> end
> I am doing it on dynamips. I did reboot both routers.
> R6(config-subif)#do sh ver | i IOS
> Cisco IOS Software, 7200 Software (C7200-K91P-M), Version 12.2(25)S14,
> RELEASE SOFTWARE (fc2)
> R6(config-subif)#
> R2(config-subif)#do sh ver | i IOS
> Cisco IOS Software, 7200 Software (C7200-K91P-M), Version 12.2(25)S14,
> RELEASE SOFTWARE (fc2)
> R2(config-subif)#
>
> Any hint is appreciated.
> br
> Ovidiu
> #18857 RS
>
>
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Received on Sat Sep 11 2010 - 15:10:28 ART