The MPLS WG Archive

[abhay <abhay@multitech.co.in>]

Ashwin,

       You can re-route and re-establish the pre-empted LSP,but the newly re-routed LSP may

       pre-empt others,which may cause a cascade effect.

       The network topology has to stabilize generally,there needs to be a latency period,before

       you retry.

       Regards,

       Abhay

Ashwinp@in.huawei.com wrote:

 Hello lei   D____________________F /                                       \A---------------B---------------------C                   \_____E______/Suppose i have a LSP ABEC of priority 3And a LSP ADF with priority 4Now i want to setup ABC with priority 2.As the resources are not available on link AB i will preempt LSP ABECBut there is a LSP ADF with priority 4 less than that of ABEC so if i preemptABEC then won't it be fair to establish the LSP through ADFC and preempt ADF if enough resources are not available ?
Thanks
Ashwin

-----Original Message-----
From: Lei Yao [mailto:lei.yao@wcom.com]
Sent: Tuesday, June 12, 2001 6:38 PM
To: Ashwinp@in.huawei.com
Subject: RE: What we do if the LSP is preempted
 

A LSP is preempted because of the lack of network resource. In other words, there is network congestion. Therefore, you should not try to re-build the preempted LSP.

-----Original Message-----
From: owner-mpls@UU.NET [mailto:owner-mpls@UU.NET]On Behalf Of Ashwinp@in.huawei.com
Sent: Tuesday, June 12, 2001 10:12 AM
To: mpls-ops@mplsrc.com; mpls@UU.NET
Subject: What we do if the LSP is preempted

Dear all

Can you please tell me what if the LSP is preempted ? Do we try to reestablish the LSP 
with some other path or we will just preempt it ? 
If we just preempt the LSP then it will be unfare with that LSP. And when should we try to 
reestablish that LSP ?

Do anybody has any ionformation regarding this ?

Thanks in advance
Ashwin