Subject: [Pce] PCC deletion of PCE-Initiated LSP

From: "Aissaoui, Mustapha (Nokia - CA/Ottawa)" <[email-masked]>
Date: Thu, 13 Jul 2017 15:11:22 +0000

Dear all,
draft-ietf-pce-pce-initiated-lsp discusses the behavior of the PCC when the PCEP session to PCE times out and specifies the State Timeout after which PCC can remove the LSPs instantiated by this PCE.

However, there are situations where the PCC may want to remove LSPs initiated by the PCE while the PCEP session is UP. This can be due to maintenance operation that requires restarting of a process, other than the PCEP process, on the router and which means those LSPs are deprogrammed for a period of time.

In a case like this, it would help if PCC reports this to PCE. One way this could be done is by sending a PCRpt message with the following Operational bit set in the LSP object:

3 - GOING-DOWN:  LSP is being torn down, resources are being
         released.

This can be done together with the R-bit (Remove flag) set in the LSP object. In other words, it is the same report sent by PCC to delete a PCC-Initiated LSP. PCE may decide to schedule a new PCInitiate message later on or wait for the operator intervention.

An alternative is to define a new status flag in the PCRpt message for PCC to inform PCE of this situation.

I appreciate any thoughts into this issue.

Regards,
Mustapha.