If you are looking to do this for setting the MPLS MTU dynamically then I don't
think this will help as starting with our forwarding infrastructure rewrite in
12.4(20)T (I would need to check to be sure when/if in other code trains) we
lost the ability to set the MPLS MTU on tunnel interfaces.
See CSCth11646.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
. . Benjamin Lovell
| | AS Video Practice
||| ||| Cisco Customer Advocacy
.|||||. .|||||. Research Triangle Park, NC
.:|||||||||:..:|||||||||:. Email: [email protected]
cisco desk:919.392.8255 cell:203.509.1562
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On Sep 29, 2010, at 3:17 PM, Alasdair McWilliam wrote:
> Hi List,
>
> Apologies if this is hidden in the list somewhere, but I've done a bit of
> Googling and can't find too much.. so here goes!
>
> I'm looking at implementing an MPLS VPN over mGRE solution to facilitate
> routing instance segregation across multiple, geographically separate sites,
> across a third party Layer 3 infrastructure. (12.2SRE for 7200, IOS-XE 3 for
> ASR1k and looks to be coming into ISR G2 in 15.1T.) However given the mix of
> GRE encapsulation to provide the PE-PE connectivity, I'm a bit worried that
> apps might have a hissy fit.
>
> My question is, does anyone know if it's possible to enable PMTUD with this
> feature? I've got it setup in a lab and the Tunnel0 and Tunnel1 interfaces
> cannot be directly modified from the CLI (they don't appear in config
> either...)
>
> The next best thing I can see would be Dynamic L3 VPNs over mGRE, but that
> isn't available on the platforms I use, and I really don't want to go as far
> as to enable full blown MPLS over point to point GRE tunnels if I can at all
> avoid it!
>
> Any tips? :-)
>
> Cheers
> Al
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