RE: LSP's for IGP versus iBGP

From: Matias Lambert (CEA) (matias.lambert@cea.ericsson.se)
Date: Fri Feb 08 2002 - 08:23:12 EST


Hi,
Do you want to use the router as LER(LSP edge Router)?
To activate inet.0 prefixs to use labels you shoud use traffic-engineering in the mpls statement.
To put labels (inet.3) to bgp routes you should put "set protocols mpls traffic-engineering bgp"
To put "RSVP labels" to IGP and BGP routes you should put "set protocols mpls traffic-engineering bgp-igp"
and to put "RSVP and LDP labels" to IGP and BGP routes you should put
"set protocols mpls traffic-engineering bgp-igp-both-ribs" (you should have Junos 5.1 or 5.2)
matias

 Matias G. Lambert
 Multiservice Network & BackBone
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-----Original Message-----
From: Nisar Ali [mailto:nisar@juniper.net]
Sent: Thursday, February 07, 2002 6:24 PM
To: Neil Stirling
Cc: 'juniper-nsp@puck.nether.net'
Subject: Re: LSP's for IGP versus iBGP

Hi:

On Thu, Feb 07, 2002 at 09:43:17AM -0000, Neil Stirling wrote:
> All,
>
> When configuring LSP's for access by route's on an IGP (i.e. OSPF) is it
> better to advertise the IGP into BGP through a
> policy statement (hence using inet.3 db)

It is not very clear what you are trying to achieve; but announcing
IGP into BGP is not a good idea for any reason.

>or enabling IGP LSP usage through
> the 'traffic-engineering shortcuts' command ?

Yes, if you want to use LSPs for destination prefixes and those prefixes
do not have same next hop as the egress of the LSP.

> The policy statement exports OSPF into BGP group internal.
>
> Also, will fast-reroute & CSPF still benefit IGP route's if the
> traffic-engineering shortcuts command is used instead of policy ?

IGP shortcuts allows you to use farthest LSP along the shortest
IGP path towards the destination.

 nisar

> I guess then RSVP & LDP still applicable.
>
> Cheers,
>
> Neil.



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