RFC 2125 (rfc2125) - Page 3 of 24

The PPP Bandwidth Allocation Protocol (BAP) / The PPP Bandwidth Allocation Control Protocol (BACP)

RFC 2125                       PPP BACP                       March 1997


   MAY       This word, or the adjective "optional", means that this
             item is one of an allowed set of alternatives.  An
             implementation which does not include this option MUST be
             prepared to interoperate with another implementation which
             does include the option.

1.2.  Terminology

   This document frequently uses the following terms:

   peer      The other end of the point-to-point link

   silently discard
         This means the implementation discards the packet without
         further processing.  The implementation SHOULD provide the
         capability of logging the error, including the contents of the
         silently discarded packet, and SHOULD record the event in a
         statistics counter.

   BOD (bandwidth on demand)
         BOD refers to the ability of a system to allocate and remove
         links in a multilink system to change the bandwidth of a
         multilink bundle.  This may be done in response to changing
         line conditions and it also may be done in response to changing
         resource conditions.  In either case, changing bandwidth
         dynamically during a multilink connection is referred to as
         BOD.

2.  New LCP Configuration Option

   Implementations MUST implement LCP as defined in [1].  LCP MUST be in
   the Network-Layer Protocol phase before BACP can be negotiated.

2.1.  Link Discriminator

   Description

      This LCP Configuration Option is used to declare a unique
      discriminator for the link that the option is sent over.  This
      option MUST be negotiated by LCP on every link.  BAP uses the link
      discriminator to differentiate the various links in a multilink
      bundle. Each link in a multilink bundle MUST have a unique
      discriminator.  The discriminator is independent for each peer, so
      each link may have 2 different LCP Link Discriminator values, one
      for each peer. When the Link Discriminator is sent in a BAP
      packet, the transmitter sends the Link Discriminator Option value
      received from its peer in the peer's LCP Configure Request packet.




Richards & Smith            Standards Track