Re: VRF ping fails to switch

It could be if you play around with different MPLS configurations that
sometimes labels are not getting allocated properly. This is something
that you have to pay attention to and know how to troubleshoot,
especially for the CCIE SP Lab. Most times it's solved by a 'clear ip
route' or shut/no shut.

So knowing how to troubleshoot your Label Switched Path is very
important.

--
Regards,
Rick Mur
CCIE2 #21946 (R&S / Service Provider)
Sr. Support Engineer  IPexpert, Inc.
URL: http://www.IPexpert.com
On 25 aug 2009, at 05:00, Geoff wrote:
> thanks for the replies, I should have mentioned I'm pretty good with
> mpls vpns so I'm not missing something basic in the config unless
> older code has some tricks? I'm unable to recreate now on a rack
> with newer code, go figure
>
> the vrf w/ route targets was on the router (part of a csc config),
> no vrf on the switch, just L3 port directly connected to the router.
>
> I took the vrf off the router and ping works fine, put it back on
> and ...... or U.U.U.U (yes reapplied all ip add)
>
> wondering if this was a bug as some mentioned, I didn't have mpls on
> that specific interface of the router but other interfaces had it
> enabled (not globally). I did have 'mpls lab proto ldp' globally
>
> messing around I threw a vrf on the switch and that ping worked too.
> also reloaded both router and switch multiple times. sdm template
> was default at first then I changed to routing.
>
> must have been a one time issue but just thought I'd ask you guys
>
> On Mon, Aug 17, 2009 at 3:51 PM, Rick Mur <rmur_at_ipexpert.com> wrote:
> Geoff,
>
> Like previous posters have said. Make sure the IP address is still
> on the interface.
> Your config should look quite similar to this (perhaps some
> interface names are different):
>
> R1
>
> !
> ip vrf TEST
>  rd 10:10
> !
> int fa0/0
>  ip vrf forwarding TEST
>
>  ip address 192.168.1.1
>  no shut
> !
>
> S1
>
> !
> ip vrf TEST
>  rd 10:10
> !
> int fa0/1
>  no switchport
>  ip vrf forwarding TEST
>  ip address 192.168.1.150
>  no shut
> !
>
> Then it should just work when you issue:
>
> R1: ping vrf TEST 192.168.1.150
>
> S1: ping vrf TEST 192.168.1.1
>
> To make sure the switch supports VRF-lite, ensure you have the
> correct SDM template selected.
> When you enable VRF it already states which image you need. At least
> the 'routing' template supports it.
> You should have no issue when only configuring R1 though. You can
> test this independently.
>
> To change the S1's SDM template issue this in configure mode:
>
> S1: sdm prefer routing
>
> Then save and reload the switch.
>
>
> --
> Regards,
>
> Rick Mur
> CCIE2 #21946 (R&S / Service Provider)
> Juniper JNCIA-ER & JNCIA-EX
> MCSA:Messaging, MCSE
> Sr. Support Engineer  IPexpert, Inc.
> URL: http://www.IPexpert.com
>
>
> On 17 aug 2009, at 01:23, Jesse Loggins wrote:
>
> Marko,
> You are correct "mpls ip" is not a necessary command, neither is the
> "route-target" command. I included both in case the original poster
> was
> experiencing some sort of IOS bug. I am aware of cases where turning
> on MPLS
> has caused things to work which would other wise not require it (an
> obvious
> bug in the code).
>
> --
> Jesse Loggins
> CCIE#14661 (R&S, Service Provider)
>
>
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