[c-nsp] MPLS via SVI on Sup720-PFC3b

[Francisco M. Zelaya]

Hi, 

Yes, you can use a vlan has an MPLS uplink on a SUP720.
I use it all the time. Please take especial care on defining the appropriate MTU.

Here is the example that you are looking for:

#sh mpls interfaces 
Interface              IP            Tunnel   Operational
Vlan425                Yes (ldp)     No       Yes  

#sh run
interface Vlan425
 description TO-XXXX
 mtu 1546
 ip address x.x.x.x 255.255.255.252
 no ip redirects
 no ip unreachables
 no ip proxy-arp
tag-switching ip

interface GigabitEthernet1/5
 description SWITCH_STACK
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,3,4,6,7,9-11,14-18,20-22,24-30,32-35,425
 switchport mode trunk  
 mtu 9216  
 no ip address


Sincerely,

Francisco 


-----Mensaje original-----
De: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] En nombre de Ryan NSP
Enviado el: martes, 20 de septiembre de 2016 04:24 p.m.
Para: Tarko Tikan <tarko at lanparty.ee>
CC: cisco-nsp at puck.nether.net
Asunto: Re: [c-nsp] MPLS via SVI on Sup720-PFC3b

Hey Tarko,

That might be less insane than vrf-lite'ing everything everywhere. I found some confusing documentation after doing some reading.

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-1SY/config_guide/sup720/15_1_sy_swcg_720/vpn.html#50545

The note on that particular bookmark makes it look like it's possible.
"Note If you use a Layer 3 VLAN interface as the MPLS uplink through a Layer 2 port peering with another MPLS device, then you can use another Layer 3 VLAN interface as the VRF interface."

Also this one (Pg. 32-5) for the PFC3.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/pfc3mpls.pdf

"Configuration of MPLS switching is supported on VLAN interfaces with the mpls ip command."

This might be my lack of familiarity with MPLS on the whole showing, but if it helps with context, I don't need to 'xconnect' anything. Really all I am looking to do is MP-BGP between 2 data centers whilst exchanging routing information via the private VRF in each rather than connecting vrf-lites.
As I add sites it gets a little unwieldy.

Thanks for the guidance here. Slightly new territory for me... just want to make sure I'm properly articulating what I'm trying to pull off. :)


On Tue, Sep 20, 2016 at 4:02 PM, Tarko Tikan <tarko at lanparty.ee> wrote:

> hey,
>
> If you don't want to spend any money on this, loop the related vlan 
> with external cable to physical port? Not pretty but you can get it 
> done with zero cost if you have two ports to spare.
>
> --
> tarko
>
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