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Re: IP MPLS VPN and Cisco

  • From: Ajay Simha <asimha@cisco.com>
  • Date: Wed, 19 Mar 2003 14:43:40 -0500
  • Cc: "Mpls-Ops@Mplsrc. Com" <mpls-ops@mplsrc.com>, Eric Osborne <eosborne@cisco.com>, Jim Guichard <jguichar@cisco.com>, Robert Raszuk <raszuk@cisco.com>
  • Resent-Date: Wed, 19 Mar 2003 16:11:05 -0500
  • To: Sebastien.Spas@alcatel.be
  • User-Agent: Mutt/1.4i

On Wed Mar 19 19:28:26 2003, Sebastien.Spas@alcatel.be wrote:
> 
>    Hi,
> 
> 
> 
>    I saw recently a document talking about "limitations" while trying to
>    do Traffic-Engineering with MPLS VPN.
> 
> 
> 
>    1) The LSPs going from PE to PE beeing used for IP VPNs can only be
>    LDP signaled LSP (LDP messages always follow the IGP shortest path,
>    then it's not possible to perform any Traffic Engineering which
>    requires RSVP signalled LSPs)

Not true. Which slide are you talking about? Please point me to the source.


> 
> 
> 
>    2) Some vendors propose to provision an RSVP signalled LSP between the
>    2 P closest to the PEs, and traffic-engineer that RSVP LSP. Then, the
>    traffic is processed through the initial LDP LSP, then thourgh that
>    RSVP LSP using label stacking.

If you have RSVP-TE between 'P' devices you need to run LDP on the top - to preserve
the inner LDP label OR turn off PHP if not the tail of the TE tunnel sees
the BGP/VPN label and drops the packet.

> 
> 
> 
> 
> 
>    Do you know if this is still the case with latest versions of Cisco
>    and Juniper equipment ?

Speaking for Cisco, for a while now IOS allows you have BGP-VPN over TE with no
LDP enabled.

-ajay
> 
> 
> 
> 
> 
>    kind regards,
> 
>    sebastien.

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