Re: [mpls] Comments on draft-aa-mpls-ldp-link-shut
Anush Mohan <anush.mohan@ericsson.com> Sun, 17 November 2019 07:24 UTC
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From: Anush Mohan <anush.mohan@ericsson.com>
To: Anush Mohan <anush.mohan@ericsson.com>, Tarek Saad <tsaad.net@gmail.com>, "draft-aa-mpls-ldp-link-shut@ietf.org" <draft-aa-mpls-ldp-link-shut@ietf.org>
CC: Vishnu Pavan Beeram <vbeeram@juniper.net>, mpls <mpls@ietf.org>
Thread-Topic: Comments on draft-aa-mpls-ldp-link-shut
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Date: Sun, 17 Nov 2019 07:24:27 +0000
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Subject: Re: [mpls] Comments on draft-aa-mpls-ldp-link-shut
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Hi Tarek, Please find my replies inline. Regards Anush P.S: Looks like my earlier reply got truncated. From: Tarek Saad <tsaad.net@gmail.com> Sent: Sunday, November 17, 2019 12:03 PM To: draft-aa-mpls-ldp-link-shut@ietf.org Cc: Vishnu Pavan Beeram <vbeeram@juniper.net>; mpls <mpls@ietf.org> Subject: Re: Comments on draft-aa-mpls-ldp-link-shut + mpls@ietf.org<mailto:mpls@ietf.org> From: Tarek Saad <tsaad.net@gmail.com<mailto:tsaad.net@gmail.com>> Date: Sunday, November 17, 2019 at 2:32 PM To: "draft-aa-mpls-ldp-link-shut@ietf.org<mailto:draft-aa-mpls-ldp-link-shut@ietf.org>" <draft-aa-mpls-ldp-link-shut@ietf.org<mailto:draft-aa-mpls-ldp-link-shut@ietf.org>> Cc: Vishnu Pavan Beeram <vbeeram@juniper.net<mailto:vbeeram@juniper.net>> Subject: Comments on draft-aa-mpls-ldp-link-shut Hi co-authors, Having gone through this draft, I have the following comments: 1. Draft does not mention LDP session protection feature -- aka targeted LDP session to peer that handles the case of keeping LDP session UP in case of Hello Adj or link adjacency down. I see several vendors (at least Juniper/Cisco) who have support for this [Anush]: Agree, we need to mention this. It helps for the issue mentioned in the draft. 2. Section 2.5.5 or rfc5036 describes a hold timer that only after expiring will trigger the Hello adjacency deletion - and only after the last hello adjacency going down will trigger the LDP session to peer to go down.. i.e. the RFC 5036 does not dictate that LDP session to peer to go down immediately after link down as stated in draft-aa-mpls-ldp-link-shut section 3 [Anush]: This particular section talks about procedures for maintaining LDP hello adjacencies, but doesn't explicitly prevent any implementation from immediately tearing down LDP session, when the only LDP enabled link to a peer goes down. Other places in the RFC leave it open to the implementation, to decide when to terminate an LDP session.