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rhogh
Beginner

P to P connection over GRE (or any other tunnel) possible?

Hi,

Part of an MPLS network I'm designing has to cross over a public IP network that does not provide MPLS/BGP facilities.

My question is can I connect two MPLS P nodes together over a point to point GRE (or other e.g. L2TP) tunnel.

Also as connectivity from my P nodes to each side of the public IP network will be FE, I assume I'm going to run into MTU problems?

Anyone tried this?

3 REPLIES 3
Not applicable

I guess using L2TPV3 would be a better option as you could run MPLS over the IP network...at IP Layer 2 VPN over which you can connect

It is also possible to run MPLS over GRE. As far as the MTU is concerned pmtud should be addresses this concern.

Hopes this help,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
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feilaowei
Beginner

I have try this,it is ok.use GRE tunnel to connect P-TO-P,you must open tag-switch ip in tunnel interface

and I suggest you use the ios version is 12 GD,if you use tunnel and P-To-P main line to transmit data same time,I hope you use ip mtu to change the mtu size is same as main line mtu,don't put the tunnel source and tunnel destination ip in IGP route table.