Bandwidth Allocation Control Protocol (BACP)
The Bandwidth Allocation Control Protocol (BACP) is a PPP NCP that negotiates a single option: the election of a favored peer. If both peers of an MP and BAP-enabled connection send BAP Call-Request or BAP Link-Drop-Query-Request messages at the same time, the favored peer is the peer whose requests are implemented.
BACP uses the PPP Protocol ID of 0xC0-2B. The packet structure of BACP is exactly the same for LCP, except that only packet types 1 through 7 are defined. For Configure-Request, Configure-Ack, Configure-Nack, and Configure-Reject BACP packet types, the BACP data portion of the BACP packet consists of the single BACP Favored-Peer option listed in Table 7.18.
Table 7.18 BACP Favored Peer Option
Option Name |
Option Type |
Option Length |
Description |
|---|---|---|---|
Favored-Peer |
1 |
6 |
A randomly allocated 4-byte magic number used to elect a favored BAP peer. The favored peer is the peer with the lowest magic number. |