XMAP
Page 21-2

XMAP

The Mapping Adjacency Protocol (XMAP) is used to discover the topology of OmniS/Rs in a
particular installation. Using this protocol, each switch determines which OmniS/Rs are adja-
cent to it by sending and responding to Hello update packets. For the purposes of XMAP,
adjacent switches are those that:
have a Spanning Tree path between them
do not have any switch between them on the Spanning Tree path that has XMAP enabled
Note
XMAP replaces the Adjacency Only mode of earlier
versions of VAP.
In the illustration here, all switches are on the Spanning Tree path. Omni Switch/Router A
and Omni Switch/Router C have XMAP enabled. Omni Switch/Router B does not. Omni
Switch/Router A is adjacent to Omni Switch/Router C and vice versa. If Omni Switch/Router B
enables XMAP, the adjacency changes. A would be adjacent to B, B would be adjacent to both
A and C, and C would be adjacent to B.
XMAP Adjacency
OSR A OSR B OSR C
SPANNING TREE PATH