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[mpls] Re: [MPLS-OPS]: PATH message lost

  • From: "Krishna Agarwal" <kagarwal@infinera.com>
  • Date: Fri, 27 Apr 2007 10:14:33 +0530
  • Thread-Index: AceIfJDRn2RVyKztQ361JvMUCYNKeQACdMVw
  • Thread-Topic: [mpls] Re: [MPLS-OPS]: PATH message lost

Hi,

  Jst to add some more..the whole RSVP protocol hinges on this idea of retransmission to mitigate transmission losses.

  Where as LDP (another signaling protocol, same as RSVP) uses TCP as the underlying protcol so that the communication is reliable.

 

Regards,

krishna

 

-----Original Message-----
From: shilpa goel [mailto:shilpa07@gmail.com]
Sent: Friday, April 27, 2007 9:01 AM
To: alaerte.vidali@nsn.com; mpls-ops@mplsrc.com; mpls@uu.net; mpls@lists.ietf.org
Subject: [mpls] Re: [MPLS-OPS]: PATH message lost

 

The concept of "refresh-timeout" is given  in RFC 2205 section 2.3 Soft State that mentions about the "cleanup-timeout" and "refresh-timeout" periods.

regards,
Shilpa

On 4/25/07, alaerte.vidali@nsn.com <alaerte.vidali@nsn.com > wrote:

Hi,

 

Do you have idea of timers involved?

 

tks,

Alaerte

 

From: owner-mpls@UU.NET [mailto:owner-mpls@UU.NET] On Behalf Of ext shilpa goel
Sent: Wednesday, April 25, 2007 1:45 AM
To: mpls-ops@mplsrc.com; mpls@UU.NET
Subject: [MPLS-OPS]: PATH message lost


Ramzi,
 
If a PATH mesg is lost while being transmitted to the destination, it will again be transmitted to the node at which the lost occurred after the REFRESH time period.

In all the nodes upstream to it, the PSBs have been formed and they maintain a REFRESH timer state.

Now until these upstream nodes receive any PATH TEAR message, their PSBs will not be deleted.

Thus when their REFRESH timer expires, they will trigger the generation of PATH REFRESH mesgs, which would appear as a NEW PATH mesg for that downstream node for which the PATH mesg was lost since it had no prior PSB maintained for it.

regards,
Shilpa

 

On 4/25/07, Ramzi Tka <ramzi.tka@gmail.com > wrote:

Hi all,
what happens when a PATH message is lost while being transmitted to the destination.
a new PATH is resent? A failure is reported and that's all? is there any timer used to notice the lost message? is it the same refresh timer?
Could some please, give some clarification?
Thanks in advance
Ramzi

 

 

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