The MPLS-OPS Archive

[Robert Raszuk <raszuk@cisco.com>]

Are you trying to use mGRE for 2547 (something which CCO calls: "Dynamic
Layer-3 VPNs (RFC 2547) Support Using Multipoint GRE (mGRE) Tunnels" ).
If so please check out: 

http://www.cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_guide09186a0080103d9d.html

You will see that you don't need to configure any tunnel interfaces (all
are set-up automatically with destinations being your vpnv4 bgp next
hops).

Cheers,
R.

> Ravi Bhagavathula wrote:
> 
> Hi,
> 
> I am trying to configure a simple network to illustrate the basic
> configuration of the dynamic layer-3 VPN (RFC 2547) support using Multipoint
> GRE tunnels on Cisco gear.
> 
> I have the following network configured (employing 7200s and GSRs).
> 
> gsrb -- vxra -- gsra -- vxrc -- vxrb
> 
> VXR-A and VXR-C are the two PE routers and I wish to bring connectivity
> between GSR-B and VXR-B using plain IP instead of MPLS for the VPN based on
> RFC 2547. I can see the vpnv4 information fine BEFORE I bring in the
> multipoint tunnel into picture. I am not quite sure what address to use for
> the tunnel interface since the documentation from Cisco does not clearly
> indicate which addresses to use.
> 
> Any help with an example configuration will be greatly appreciated.
> 
> Thanks a lot.
> 
> Ravi B
> Wichita, KS
> 
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