From: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
To: "bess@ietf.org" <bess@ietf.org>
CC: P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>, Jiang He
 <jiang.he@ericsson.com>
Thread-Topic: EVPN MH: Backup node behavior in Primary Path Failure
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Date: Wed, 3 Oct 2018 10:15:27 +0000
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Subject: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Hello Everyone,

Sorry if it is a duplicate. I repost this query as I did not receive any re=
sponse 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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<p class=3D"MsoPlainText">Hello Everyone,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Sorry if it is a duplicate. I repost this query as I=
 did not receive any response yet.<o:p></o:p></p>
<p class=3D"MsoNormal">(I was wondering if this mail already reached the gr=
oup or not)<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have a question on Primary PE encountering a fa=
ilure in EVPN multihoming<o:p></o:p></p>
<p class=3D"MsoPlainText">in single active mode.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">RFC7432, section 14.1.1:<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&lt;snip&gt;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; If there is more than one backup PE for a given ES, the rem=
ote PE<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; MUST use the primary PE's withdrawal of its set of Ethernet=
 A-D per<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; ES routes as a trigger to start flooding traffic for the as=
sociated<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; MAC addresses (as long as flooding of unknown unicast packe=
ts is<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; administratively allowed), as it is not possible to select =
a single<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; backup PE.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&lt;/snip&gt;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Questions:<o:p></o:p></p>
<p class=3D"MsoPlainText">1. Will the node in backup mode forward the packe=
t to CE?<o:p></o:p></p>
<p class=3D"MsoPlainText">2. Will all the nodes in backup mode forward the =
packet before DF election?<o:p></o:p></p>
<p class=3D"MsoPlainText">3. If they forward, how is duplicate packets hand=
led, in this case?<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Please help me anwere these questions.<o:p></o:p>=
</p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Thanks &amp; Regards<o:p></o:p></p>
<p class=3D"MsoPlainText">Jaikumar S<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
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