Bay Networks 5393 User Manual page 68

Release 5.1 Supplement for Remote Annexes
119346-A Rev. A
50
While the MP link is in the authentication phase, the Remote Annex
initiates the Bundle Discovery Protocol to determine if an MP bundle
head for the user exists. The MP bundle head is the Remote Annex that
contains the first (primary) link of an MP bundle. The Bundle Discovery
Protocol searches first the current Remote Annex for an MP bundle, then
the other Remote Annexes in the MMP group. If the Bundle Discovery
Protocol does not find an existing MP bundle, the current MP link
becomes the primary MP link and creates an MP bundle, and the current
Remote Annex becomes the MP bundle head. If the Bundle Discovery
Protocol locates an existing MP bundle for the remote user, the current
MP link becomes a secondary MP link. If the MP bundle head is a different
Remote Annex, the current link is tunnelled to that MP bundle head via
L2TP and becomes a virtual link; virtual links are always secondary links.
Secondary MP links are combined with the primary MP link to form an
MP bundle; all MP fragments are reassembled by the MP bundle head.
MP bundles handle links terminating on the MP bundle head and virtual
links equally, without preference. A primary link always resides on the
MP bundle head and is never a virtual link.
The maximum possible number of MP links permitted on any
Remote Annex is the maximum number of actual channels plus
an equal number of virtual links.