The MPLS-OPS Archive

["Ibrahim Bac" <ibac@realtech.com>]

David,

     I disagree with you. Under MPLS you don't have use different network numbers for each VPN. Assume you have two VPNs connected to r1 and  r2 and they use same IP numbering.   You have two CEs with same IP number belongs two different VPN connected to r2. When you ping from r1 to remote CE ip number what actually you are pinging ?

     You may ping from r1 to remote CE by specifying source interface (extended ping) that will push r1 to look VPN specific route look up to resolve and understand which CE you are trying to ping. 

      Regards.

      Ibrahim Bac



>>> David Paraje <david.paraje@telia.es> 11/21/00 10:49AM >>>
I am not agree.
Yes, If r1 and r2 are PE routers, They can ping CE routers, or almost, my
experience said yes, maybe in some scenarios or configs not.



> -----Mensaje original-----
> De:	Ibrahim Bac [SMTP:ibac@realtech.com] 
> Enviado el:	martes 21 de noviembre de 2000 15:48
> Para:	kvyoung@21cn.com; mpls-ops@mplsrc.com 
> Asunto:	Re: vpn question
> 
> Kevin,
> 
>       Under normal configuration r1 can not ping to r4 also r2 can not
> ping to r3. Your backbone doesn't know customer (edge) info.
> You should ping from r3 to r4. Double check your r1 and r2 configurations.
> 
> 
> 
> 
> >>> "kevin Young" <kvyoung@21cn.com> 11/21/00 05:46AM >>>
> hi, group
>    when i config mpls vpn, r1 and r2 are 3640, as PE; r3 and r4 are 2610,
> as CE. IOS are 12.1.3T
> r3-------------r1--------------r2---------------r4
>     ether            atm               ether
> 
> r1 could ping r3, and r2 could ping r4, r3 and r4 could see each other
> routes, but r3 couldn't ping r4
> and r1 couldn't ping r4, r2 could not ping r3.
> i fould r1 and r2 didn't tag the vpn, this is the show on r1:
> 
> r1#sh tag-switching for vrf vpn-lab detail
> Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
> tag    tag or VC   or Tunnel Id      switched   interface
> 16     Untagged    136.5.1.0/24[V]   0          Fa0/1      10.1.1.1
>         MAC/Encaps=0/0, MTU=1500, Tag Stack{}
>         VPN route: vpn-lab
>     Per-packet load-sharing
> 17     Aggregate   10.1.1.0/24[V]    0
>         MAC/Encaps=0/0, MTU=0, Tag Stack{}
>         VPN route: vpn-lab
>     Per-packet load-sharing
> 
> any advice are appreciated.
> 
> 
> one another question: one PE in a AS through static route connects to
> another PE in another AS, 
>   could it can solve the mpls vpn could not span AS problem ? thanks.
> 
> This is same as mpls vpn over multiple AS.
> 
> 
>         Regards.
> 
>      Ibrahim Bac
>      
> 
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