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Using Interswitch Protocols AMAP Overview
OmniSwitch 6600 Family Network Configuration Guide April 2006 page 10-3
AMAP Overview
The Alcatel Mapping Adjacency Protocol (AMAP) is used to discover the topology of OmniSwitches or
Omni S/Rs in a particular installation. Using this protocol, each switch determines which OmniSwitches
or Omni S/Rs 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.
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).
Switch A Switch B Switch C
Spanning Tree Path
OmniSwitch 7700
TM
OmniSwitch 6648
OmniSwitch 6648
OmniSwitch 6648
OmniSwitch 6648
OmniSwitch 6648
OmniSwitch 6648