VPN tag not generated

[dabraj123]

Hello group,

Recenlty I'm having some problem in my production PE routers. At times, the PE is not generating any MPLS VPN tag. When this happens, a syslog comes saying:

"Jun 30 10:16:16.169: %TFIB-4-FIBCBLK: Missing MPLS Forwarding Information Base table for tableid 65535 during Route Tag Change event"

On the PE, 'show ip cef vrf xxx prefix' does not show any local tag [attached].

So, on the upstream PE no MPLS-VPN tag is there except for the top most label for downstream PE.

To resolve this probelm, I enable and disable cef on the VPN interface by 'no ip cef/ ip cef' command. Then it works fine.

The IOS version is: c3745-js-mz.122-15.T14

Might be, someone in the group find any reason to this type of problem.

Regards,

Dabraj Sarkar

Grameenphone Ltd

[attrgautam]

Looks more like a code issue. Did you try changing the IOS ? Maybe you can try adding the route as a non-recursive route and see if it helps

[dabraj123]

Dear Gautam,

Thanks for the response. Could you please explain non-recursive route in this context? I'm running static routing between PE-CE. Does non-recursive route mean that to configure exit interface along with next hop IP in the static route definition?

I'm trying to change the IOS. Any suggestion regarding stable S-train codes?

Regards,

Dabraj

[attrgautam]

yes thats right. It was just a suggestion. You could try that.

Not sure i can help much S-train for 3700. 12.3 (18) Sp services should be fine i think.

[dabraj123]

Hi Gautam,

I'll have a research on the code. Let me check the recursive routing issue.

Best regards,

Dabraj

[romccallum]

Dabraj,

Is this just a lab environment? I wouldnt really recommend running a live environment with a 3745. As already stated as well your code to me is very suspicious. Firstly you are running an enterprise based code but wanting to do SP features. I would change to either an "S" train or lookout a good old Telco train which done the trick for me in my lab setups.

[dabraj123]

Dear McCallum,

Thanks for the response. It could be supicious but its true. My PEs are 3745 and in production for almost two years! Could you please recommend an S train code for this platform. The flash size is 64 MB and RAM is 256 MB.

Regards,

Dabraj