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[bess] A question on using EVPN label and Alias label in load balancing

Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com> Mon, 18 February 2019 10:07 UTC

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From: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
To: "bess@ietf.org" <bess@ietf.org>
Thread-Topic: A question on using EVPN label and Alias label in load balancing
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Date: Mon, 18 Feb 2019 10:07:47 +0000
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Subject: [bess] A question on using EVPN label and Alias label in load balancing
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Hi All,
                     --------------
                     |            |
              PORT1 |  DEVICE1   |PORT3
       --------------|     PE1    |-------------
       |      1/5    |  2.2.2.2   | 1/4         |
       |             |            |             |
       |             --------------             |
       |PORT1              |PORT2               |PORT2
--------------            |             +------------+            --------------
 |            |            |             |            |            |            |
 | DEVICE4    |            |             |            |PORT1       | DEVICE4    |
 | (CE1)      |            |             |   DEVICE3  |------------| (CE2)      |
 | Multi-home |            |             |     PE3     |       PORT3| Single home|
 |            |            |             |   4.4.4.4  |            |            |
--------------            |             +------------+            --------------
       |PORT2              |1/1                |PORT3
       |                   |PORT2              | 1/6
       |             --------------            |
       |             |            |            |
       |       PORT1 |  DEVICE2   |            |
       --------------|    PE2     |-------------
                1/4  |  3.3.3.3   |PORT3
                     |            |1/4
                     --------------

Let's say CE1 is connected to PE1 and PE2 (all-active case)
and PE1 and PE2 learn same MAC1 entry (say different destination)
PE3 will learn MAC1 from both PE1 and PE2 with their respective
EVPN label (Assume BGP ECMP is enabled). As part of load balancing,
should PE3 always use EVPN label to send the frame destined to MAC1
or can Alias label also be used? what is the need of using EVPN label?

Thanks & Regards
Jaikumar S

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