Alcatel-Lucent 6850-48 网络指南

Using Interswitch Protocols

AMAP Overview

OmniSwitch AOS Release 6 Network Configuration Guide

page 20-3

The Alcatel-Lucent Mapping Adjacency Protocol (AMAP) is used to discover the topology of 
OmniSwitches in a particular installation. Using this protocol, each switch determines which 
OmniSwitches are adjacent to it by sending and responding to Hello update packets. For the purposes of 
AMAP, 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 AMAP enabled

In the illustration here, all switches are on the Spanning Tree path. OmniSwitch A and OmniSwitch C 
have AMAP enabled. OmniSwitch B does not. OmniSwitch A is adjacent to OmniSwitch C and vice 
versa. If OmniSwitch B enables AMAP, the adjacency changes. OmniSwitch A would be next to 
OmniSwitch B, B would be adjacent to both A and C, and C would be adjacent to B.

AMAP switch ports are either in the discovery transmission state, common transmission state, or passive 
reception state. Ports transition to these states depending on whether or not they receive Hello responses 
from adjacent switches.

Note. All Hello packet transmissions are sent to a well-known MAC address (0020da:007004).