Amap Overview; Amap Transmission States - Alcatel OmniSwitch 6800 Series Network Configuration Manual

Using Interswitch Protocols

AMAP Overview

The Alcatel 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 B, B
would be adjacent to both A and C, and C would be adjacent to B.
Switch A
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).
OmniSwitch 6800 Series Network Configuration Guide
Switch B
Spanning Tree Path

AMAP Transmission States

November 2004
AMAP Overview
Switch C
page 8-3