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Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com> Thu, 04 October 2018 09:28 UTC

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From: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, "bess@ietf.org" <bess@ietf.org>
CC: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Thanks Jorge for the quick reply.
Please find further question below.

From: Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.com>
Sent: Thursday, October 4, 2018 1:52 PM
To: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>; bess@ietf.org
Cc: Jiang He <jiang.he@ericsson.com>; P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Hi,


Questions:

  1.  Will the node in backup mode forward the packet to CE?

[JORGE] as soon as it becomes DF it can forward packets to the CE. The backup node will have to run DF election upon the ES route withdrawal from the primary. If AC-DF is enabled, it can also react to the withdrawal of AD routes from the primary PE.

[Jai] Does that mean if any packet comes to a node that is still in the backup mode will get dropped, before the new DF election is complete? Why cant this be used as FRR? Or what is the use case of having backup node(s)?



  1.  Will all the nodes in backup mode forward the packet before DF election?

[JORGE] Only the new DF can forward.



3. If they forward, how is duplicate packets handled, in this case?
[JORGE] see above.

My two cents..

Thanks.
Jorge



From: BESS <bess-bounces@ietf.org<mailto:bess-bounces@ietf.org>> on behalf of Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@ericsson.com>>
Date: Thursday, October 4, 2018 at 10:03 AM
To: "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:bess@ietf.org>>
Cc: Jiang He <jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com<mailto:p.muthu.arul.mozhi@ericsson.com>>
Subject: [bess] EVPN MH: Backup node behavior in Primary Path Failure


Hello Everyone,

Sorry if it is a duplicate. I repost this query as I did not receive any response yet.
(I was wondering if this mail already reached the group or not)


I have a question on Primary PE encountering a failure in EVPN multihoming

in single active mode.



RFC7432, section 14.1.1:

<snip>

   If there is more than one backup PE for a given ES, the remote PE

   MUST use the primary PE's withdrawal of its set of Ethernet A-D per

   ES routes as a trigger to start flooding traffic for the associated

   MAC addresses (as long as flooding of unknown unicast packets is

   administratively allowed), as it is not possible to select a single

   backup PE.

</snip>



Questions:

1. Will the node in backup mode forward the packet to CE?

2. Will all the nodes in backup mode forward the packet before DF election?

3. If they forward, how is duplicate packets handled, in this case?



Please help me anwere these questions.



Thanks & Regards

Jaikumar S

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