Bandwidth Allocation Control Protocol (Bacp); Working With Bacp; Bandwidth Allocation Control Protocol - Bay Networks NauticaRS Reference Manual

Bandwidth Allocation Control Protocol (BACP)

Working with BACP

117237-E Rev.00
BACP provides a flexible and effective way to add and remove
bandwidth between two peers.
The BACP protocol negotiates pre-defined options during the first
part of a valid call. When BACP has successfully negotiated on
any of the links, it is then accessible for all of the links for that
particular call.
The BAP protocol is responsible for the negotiations to
coordinate the requests for adding or removing the bandwidth
during the call.
There are two means for requesting additional bandwidth in a
bundle, a Call-Request and a Callback-Request.
To reduce current bandwidth, only one command is implemented
by the BACP protocol (Link-Drop-Query-Request). BAP defines
this procedure for the two endpoints of the call by adding and
dropping links when certain parameters are met during a call:
• Request permission to add a link to a bundle (Call-Request).
• Request that the peer to add a link to a bundle (via a
Callback-Request).
• Negotiate with the peer to drop a link from a multi-link
bundle (this means that the peer cannot refuse)
(Link-Drop-Query-Request).
After the negotiations for BACP have successfully taken place,
either peer can request that another link is added to the current
bundle via a BAP packet. Alternatively, if a link has already been
added to the current bundle, then a BAP
Link-Drop-Query-Request is submitted to the peer for release of
the additional bandwidth.
Introduction to Protocols and Routing
1-27