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[bess] Regarding the Alias label usage in EVPN Multihoming

Chalapathi Andhe <chalapathi.andhe@ericsson.com> Wed, 06 March 2019 06:26 UTC

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From: Chalapathi Andhe <chalapathi.andhe@ericsson.com>
To: "bess@ietf.org" <bess@ietf.org>
CC: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, Sean Wu <sean.wu@ericsson.com>
Thread-Topic: Regarding the Alias label usage in EVPN Multihoming
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Date: Wed, 06 Mar 2019 06:26:51 +0000
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Subject: [bess] Regarding the Alias label usage in EVPN Multihoming
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Hi All,

Can you please help us on the following issue.
In the following diagram, PE1, PE2, PE3 are connected to the same ES [ES1] in Single active mode, and PE4 is a remote PE.
Let's say PE1 is advertising the MAC1 route, PE4 will install the MAC1 with the PE1 as primary path with MAC Label,
and PE2, PE3 as backup with the Alias Label. Now if the PE1 to CE1 link goes down, then PE1 withdraw the EAD/ES route
which will be processed by PE4.
Now what should the forwarding state at PE4 ?, PE4 should update the forwarding state of MAC1 with the PE2, PE3 Alias label
and any traffic destined to MAC1 should be flooded to PE2, PE3 with the Alias labels ?
Or packet should be flooded to PE2, PE3 with the Flood labels ? Or should it be some other method ?

In similar if the ES is operating in all active mode, what should be the forwarding state at PE4 ?
PE4 should update the forwarding state of MAC1 with the PE2, PE3 Alias label
and any traffic destined to MAC1 should be sent to either PE2 or PE3 with the Alias labels [ not flood to both] ?
Or packet should be flooded to PE2, PE3 with the Flood labels  or Alias Label ?
Or should it be some other method ?


[cid:image001.jpg@01D4D40A.EEEB0C50]


Thanks,
Chalapathi.

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