Amap Overview; Amap Transmission States - Alcatel-Lucent OmniSwitch 6850-48 Network Configuration Manual

Using Interswitch Protocols

AMAP Overview

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.
OmniSwitch A

AMAP Transmission States

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 AOS Release 6 Network Configuration Guide
OmniSwitch B
Spanning Tree Path
September 2009
AMAP Overview
OmniSwitch C
page 20-3