Subject: Mail regarding draft-ietf-l2vpn-pbb-vpls-pe-model

From: Alexander Vainshtein <[email-masked]>
Date: Sun, 15 Jan 2012 13:34:10 +0200

Hi all,
I have a question regarding draft-ietf-l2vpn-pbb-vpls-pe-model.

In Section 4 "Packet Walkthrough" the draft, to the best of my understanding, states that a packet received from one of the B- PWs is mapped to an appropriate virtual interface of the B-component without any MAC lookup because B-MAC.C-MAC-based forwarding per se is done by the B-component.
It further states that forwarding from one virtual interface of the B-component to another such interface usually does not happen because there is only one split horizon group in the VPLS instance.

My reading of this text suggests that B-component of the 802.1ah bridge (and hence presumably the 802.1ah bridge itself) is aware of split horizon groups.
On the other hand, the draft mentions usage of MSTP as the loop-breaking mechanism in 802.1ah.

Did I miss something? If not, which component of the PE reference model is aware of split horizon groups?

Regards,
     Sasha

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