Hi Swati,
The scope of flooding using opaque LSAs is limited to given area/level.
Therefore to establish the inter-area LSP your headends will not have enough
information to compute full end to end ERO. There are two ways to solve it:

 Online: By means of loose ERO (you indicate via hops or areas) and rely on
the ABRs to compute it's own part of the ERO.

 Offline: By means of offline server running CSPF which would be receiving
information about TE topology from multiple areas.

Please refer to draft-kompella-mpls-multiarea-te-01.txt which postulates a
set of mechanisms, and then outlines how these mechanisms could be used to
establish/maintain TE LSPs that span multiple areas.

Regards,
Manav Bhatia

----- Original Message -----
From: "Swati Rastogi" <swatirstogiYAHOO.COM>
To: <OSPFDISCUSS.MICROSOFT.COM>
Sent: Friday, September 07, 2001 5:39 PM
Subject: Opaque LSAs and TE

> Hi,
> The opaque LSAs used for TE don't cross area boundaries. So whilst we can
> divide the network topology into areas we can't actually do TE across
those
> areas. This limits my scope to within the areas only which is not really
> very good. There must be a way out to do something .. can anybody please
> throw light on that !
>
> Regards,
> Swati

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