Re: LSP's for IGP versus iBGP

From: Nisar Ali (nisar@juniper.net)
Date: Thu Feb 07 2002 - 16:24:03 EST


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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