The MPLS WG Archive

[cxhu@tri.sbc.com]

Folks:

 

Thanks all for providing me help on this! I still have question regarding the draft-katz-yeung-ospf-traffic-06.txt. Why this draft only works for a single area?  As my understanding, the type 10 LSA is used to prune the links that don’t meet QoS requirement within the area, such as bandwidth. After pruning, the same SPF algorithm and route distribution process will be applied to compute the shortest path that meets traffic requirements across the different areas. Type 1 (router) and type 2 (network) are also flooded within the area. However, the shortest paths can be calculated based on these LSAs to the ABRs, then ABR will re-distribute them as type 3 LSA to the backbone area and then other areas.

 

Thanks!

Cheng-hong

-----Original Message-----
From: Rajesh Potti [mailto:rpotti@nortelnetworks.com]
Sent: Friday, February 08, 2002 1:27 PM
To: Hu, Cheng-Hong
Subject: Re: A question for OSPF-TE

This draft talks about how to make CBR work for a single area only. The idea is that, all the routers in the carrier's network that do
constraint based routing are configured to be in the same area.

 There is another draft  which talks about interarea Traffic Engineering, but i dont think it became poular as this one.

Thanks,
Rajesh

cxhu@tri.sbc.com wrote:

-----Original Message-----
From: Hu, Cheng-Hong
Sent: Friday, February 08, 2002 1:05 PM
To: mpls@UU.NET
Subject: RE: TTL draft: draft-ietf-mpls-ttl-00.txt

Hi,

OSPF-TE (draft-katz-yeung-ospf-traffic-06.txt) uses type 10 LSAs, which have
intra-area flooding scope. Does it mean that constraint-based routing only
works for single area? How to make it work for multiple areas?

Thanks!

Cheng-hong