[c-nsp] MPLS VPN with PE over GRE tunnels

[Arie Vayner (avayner)]

On 6500 if you want to use MPLS over GRE, you would need to have your
core facing links (through which the GRE packets are sent/received) on a
SIP400 card...

Alternatively, SUP2T can support this natively.
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_p
aper_c11-652042.html#wp9000959


Arie 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Gert Doering
Sent: Tuesday, September 20, 2011 10:55
To: Ross Halliday
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] MPLS VPN with PE over GRE tunnels

Hi,

On Mon, Sep 19, 2011 at 07:18:19PM -0400, Ross Halliday wrote:
> Currently our network has one switch that is at the hub of our 
> transition to MPLS as we cut various devices over and wait for
maintenance windows. It has:

This "switch" would be a 6500 with all these protocols being enabled,
and the problem spot is "packet comes in MPLS-encapsulated and needs to
leave GRE-encapsulated" (or return path)?

> Any help or suggestions would be very appreciated!

There was something about the 6500 architecture that certain
combinations of ingress and egress need packets to go through the
forwarding plane twice, and you need to enable "packet recirculation"
for it to do that.

The command I could find for that is "mls mpls tunnel-recir", but you
might want to verify with the docs whether this is what you want.

Cisco(config)#mls mpls ?
...
  tunnel-recir     Recirculate Tunnel packets

gert

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