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Re: [Isis-wg] Reg: draft-ietf-isis-reverse-metric-03

Vijay Kumar Vasantha <vvasanth@Brocade.com> Sat, 15 June 2013 15:41 UTC

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From: Vijay Kumar Vasantha <vvasanth@Brocade.com>
To: Shane Amante <shane@castlepoint.net>
Date: Sat, 15 Jun 2013 09:39:28 -0600
Thread-Topic: [Isis-wg] Reg: draft-ietf-isis-reverse-metric-03
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Subject: Re: [Isis-wg] Reg: draft-ietf-isis-reverse-metric-03
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Hi,

Thanks Shane & Naiming for explaining and pointing out to the related draft 'draft-ietf-isis-oper-enhance-03'.
Yes, the sec 3 of this related draft addresses my question.

Thanks,
Vijay


From: Shane Amante [mailto:shane@castlepoint.net]
Sent: Saturday, June 15, 2013 12:56 AM
To: Vijay Kumar Vasantha
Cc: isis-wg@ietf.org
Subject: Re: [Isis-wg] Reg: draft-ietf-isis-reverse-metric-03

Hi Vijay,

Please see below.

On Jun 13, 2013, at 1:18 AM, Vijay Kumar Vasantha <vvasanth@Brocade.com<mailto:vvasanth@Brocade.com>> wrote:
Hi,

While reading draft-ietf-isis-reverse-metric-03 I got the following query, could someone please clarify it.

-          Could the link to DIS be made link of last resort on a LAN.


For example consider a topology where three routers A, B & C are connected on a LAN, where A is DIS.

A----------A'-----------B
                    |
                    |
                    |
                   C

I take it A' represents the pseudo-node?



If administrator wishes to remove the bi-directional traffic for node A, then configuring reverse-metric on A will,

-          Make the cost from A to A' high.
-          Not affect the cost from A' to A in pseudo-node LSP.

The latter bullet is incorrect for the scenario you describe.  The DIS should increase the cost in the pseudo-node LSP (A') back to A, at the same time.  But, before you answer, please see the next response.



So the traffic from non-DIS nodes could still reach DIS on this LAN.

Perhaps one of the ways to address it would be,
Upon administrator enabling reverse-metric on a LAN,
-          If the node is a DIS on the LAN then DIS could increase the cost to itself in the pseudonode LSP.

Actually, I believe the comment/question you have is actually more applicable to a related draft:
http://tools.ietf.org/html/draft-ietf-isis-oper-enhance-03

In particular, you may wish to review Section 3, "Pseudonodes with Non-zero Metrics", of the aforementioned draft, which describes where the DIS, itself, is altering the metric in the Pseudo-node LSP to achieve the effect you describe.

Anyway, let me know if the above addresses you question or not.

Thanks,

-shane



Thanks,
Vijay




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