Quick Best Practice question

Unanswered Question
May 8th, 2007
User Badges:
  • Silver, 250 points or more


I'm configuring multiple vrf in my core.

I would like to know if I'm better off configuring switchport between my router with each vrf assigne to a vlan...(a bunch of /30 network)


Create routed sub-interface with dot1q encapsulation.(/31 P.TO P. network)

The last one has the advantage of not having any STP on the link...

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 4 (1 ratings)
bjornarsb Tue, 05/08/2007 - 23:58
User Badges:
  • Bronze, 100 points or more


I'm not sure that I get your point.

You cannot assign vrf on a switchport.

It has to be a layer 3 port!

In the core one the link between your PE and P routers you just enable tag-switching as you probarly already have done :)




mohammedmahmoud Wed, 05/09/2007 - 00:17
User Badges:
  • Green, 3000 points or more


If i understand you correct, you are using VRF-Lite, the second option is the finest in the point that you are not going to have any switching issues.

HTH, please rate if it does help,

Mohammed Mahmoud.

dominic.caron Wed, 05/09/2007 - 09:10
User Badges:
  • Silver, 250 points or more


My Cisco SE think I would be better with VLAN apply to switchport. I must admit he make sense. Not that sub-interface would not be faster, they would also be more sensible to link flapping.

Anyway, this is a temporary solution. I getting way to much VRF demand that I'm bottlenecking. I might have to go MPLS in the short run.

mohammedmahmoud Wed, 05/09/2007 - 10:15
User Badges:
  • Green, 3000 points or more

Hi Dominic,

I think his point of view makes sense, i think that going to MPLS might be a scalable solution for you, please keep us updated with your case, its an exciting one.


Mohammed Mahmoud.


This Discussion