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Thread: Re: L3VPN : CE Multihoming Question
Re: L3VPN : CE Multihoming Question
user name
 2007-04-05 22:21:56 

  


  

    



But as per RFC 4364 section 4.3, it is the decision 
process of protocol running between PE and CE


 


" At these other PEs, BGP will again choose 
the
   best route for a particular VPN-IP4 address prefix.  
Then the chosen
   VPN-IP4 routes are converted back into IP 
routes, and "imported" into
 ;  one or more VRFs. ; Whether they 
are actually installed in the VRFs
 ;  depends on the decision 
process of the routing method used between
   the PE and those CEs 
that are associated with the VRF in question.
  ; Finally, any route 
installed in a VRF may be distributed to the
   associated CE 
routers"


 


Regards,


Kalyan




  
----- Original Message ----- 

  
  
  
Sent: Friday, April 06, 2007 10:31 
  AM

  
Subject: RE: L3VPN : CE Multihoming 
  Question


  


  
Yes, BGP should compare these routes. Once RD is 
  stripped and route is candidate for import into a VRF, the 
  routes are 

  
like any other BGP routes with attributes and should be 
  compared.

  
 


  
-Deven


  

  

  From: Kalyankumar S Asangi 
  [mailto:kalyanahuawei.com] 
Sent: Thursday, April 05, 2007 6:58 
  PM
To: ietf.org">l3vpnietf.org
Subject: L3VPN : CE 
  Multihoming Question


  

  

  
Hi ,

  
 

  
I have question related to CE multihoming in the 
  following scenario

  
 

  
1. CE1 is multi homed to PE1 and PE2 and sends 
  the route 10.10.0.0/16 to both PE1 and PE2
2. PE1 select this route as best 
  route and send it to PE3 as VPNv4 with RD 1:1 and ERT 11:11
3. PE2 also 
  select this route as best route and send it to PE3 as VPNv4 with RD 2:2 and 
  ERT 22:22
4. PE3 has VRF1 connected to CE2 with IRT 11:11 and 22:22 and 
  OSPF is running between PE3 and CE2 
5. Now PE3 receives the two VPNv4 
  routes for prefix 10.10.0.0./16 from two sources with two different 
  RD, 
  ; Which route PE3 BGP will choose and download to VRF1 
  ? 
6. Should BGP compare these two routes even if they come with two 
  different RDs and download one route to VRF
   or download both 
  routes to VRF as they come with two different RDs ?

  
 

  
Regards,
Kalyan

  

  
  
   
     
    






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