1Qay
Provider Backbone Bridge Traffic Engineering (PBB-TE). It is related to ITU-T protection
switching, in that it creates point-to-point links protected by IEEE P802.1ag CFM
or ITU-T Y.1731 OAM. It is closely related to IEEE P802.1ah backbone bridges, in that
a specific data plane is proposed, using the format of 802.1ah MAC-in-MAC frames.
The point-to-point path between a pair of I-components is not established by learning
the I-components??™ MAC addresses as the data frames traverse the backbone network??™s
spanning tree. Rather, the entries in the filtering database for those MAC addresses
are created by management operations, based on knowledge of the topology of the
network??”much as private connections are created in current telephony networks.
Other alternatives have also been discussed: the filtering database entries could be
created by dynamic protocols such as IS-IS, carrying MAC addresses, or by a variant of
GMPLS, the MPLS signaling protocol.
Typically, two such paths are created between any pair of I-components, a primary
and a secondary. IEEE 802.1ag CFM and/or Y.1731 OAM can be used end-to-end to
detect the failure of either path, notify management, and switch traffic to the other
path if needed.
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