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Comment on DestinationMac in draft-mmm-bfd-on-lags

"JOVELPONNAIEN, ARULMOHAN (ARULMOHAN)" <arulmohan.jovelponnaien@alcatel-lucent.com> Fri, 28 September 2012 10:45 UTC

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From: "JOVELPONNAIEN, ARULMOHAN (ARULMOHAN)" <arulmohan.jovelponnaien@alcatel-lucent.com>
To: "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>
Date: Fri, 28 Sep 2012 16:15:28 +0530
Subject: Comment on DestinationMac in draft-mmm-bfd-on-lags
Thread-Topic: Comment on DestinationMac in draft-mmm-bfd-on-lags
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Hi All,

Micro-BFD session would use dedicated destination MAC address allocated for IANA range(RFC 5342). But this MAC address range is not link-level and would allow forwarding of Link-Level BFD packets by intermediate L2 switches.

Assume case below, here it is possible that 3 micro BFD sessions from Router1 could be forwarded on single-port to Router2.
Router1 ------------(3-port) LAG------------L2 Switch-------(1-port LAG)-----------Router2

If MAC-address is chosen from range 01:80:c2:xx:xx:xx, then this case would not arise. Micro-BFD session would then be terminated by L2 switch immediately. By 802.1d standard 01:80:c2:xx:xx:xx would be terminated by L2 switch.

Is it not better if we choose a MAC address in 01:80:c2 range similar to LACP to make sure micro-BFD session remains link-level protocol?

Regards,
Arul Mohan.

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