Re: [OSPF] More Comments on OSPF S-BFD Discriminator

"Acee Lindem (acee)" <acee@cisco.com> Mon, 09 November 2015 22:24 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Manav Bhatia <manavbhatia@gmail.com>
Thread-Topic: [OSPF] More Comments on OSPF S-BFD Discriminator
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Date: Mon, 9 Nov 2015 22:24:14 +0000
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Subject: Re: [OSPF] More Comments on OSPF S-BFD Discriminator
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Hi Manav,

From: Manav Bhatia <manavbhatia@gmail.com<mailto:manavbhatia@gmail.com>>
Date: Friday, November 6, 2015 at 11:35 AM
To: Acee Lindem <acee@cisco.com<mailto:acee@cisco.com>>
Cc: "draft-ietf-ospf-sbfd-discriminator@ietf.org<mailto:draft-ietf-ospf-sbfd-discriminator@ietf.org>" <draft-ietf-ospf-sbfd-discriminator@ietf.org<mailto:draft-ietf-ospf-sbfd-discriminator@ietf.org>>, "Alvaro Retana (aretana)" <aretana@cisco.com<mailto:aretana@cisco.com>>, OSPF WG List <ospf@ietf.org<mailto:ospf@ietf.org>>
Subject: Re: [OSPF] More Comments on OSPF S-BFD Discriminator

Hi Acee,

Sorry for the late response.

We will add the following text in the next update

“When multiple S-BFD discriminators are advertised how a given discriminator is mapped to a specific use case is out of scope for this document.”

I’m still struggling with the utility of automatic discovery of multiple S-BFD discriminators if one has no way to map them to an endpoint or the corresponding service.

Thanks,
Acee





Will address the other minor comments in the next rev.

Cheers, Manav

On Mon, Oct 26, 2015 at 5:37 AM, Acee Lindem (acee) <acee@cisco.com<mailto:acee@cisco.com>> wrote:
I have one major comments and I’ve copied Alvaro since he is reviewing the
base S-BFD drafts.

  If an OSPF router advertises multiple BFD discriminators, how do the
other OSPF routers in the OSPF routing domain map the S-BFD discriminators
to the OSPF router IP endpoints and services?

I also have some minor comments:

  1) This draft should reference the RFC 4970BIS draft as this is in RFC
EDIT state.
  2) Section 2.1 - The base RFC 4970BIS draft states that unrecognized
TLVs are ignored (as stated in section 3). This is not specific to this
TLV.
  3) Section 2.2 - This says the Opaque ID must be 0. Note that an OSPF
router can now originate multiple OSPF RI LSAs instances. I think this TLV
should be allowed in an OSPF RI LSA subsequent to the first.
  4) Section 2.2 - I don’t think we should advocate sending an empty OSPF
Router Information LSA. I’d remove this case.


Thanks,
Acee



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