Avaya P580 - Manual (Page 37)

Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1 1-9
Introduction
Figure 1-2. Layer 3 Supervisor Conceptual Operation
Redundant Supervisor
The redundant supervisor module is an auxiliary (standby)
supervisor module that acts as a fault-tolerant supervisor in the
event that the active supervisor fails. The redundant supervisor
provides a seamless solution to switch failure. Once the redundant
supervisor is installed, loaded with the same software version as the
active supervisor, and synchronized, it is ready to act as a backup to
the active supervisor. If the active supervisor does fail, the
redundant module quickly assumes control with the least possible
effect on network operation. No user intervention is required for the
CPU module switchover. The management view is accessible
without changing IP or MAC addresses.
The redundant supervisor introduces the concepts of an internal
network and internal network mask.
The internal IP network consists of an internal network Virtual LAN
(VLAN) that is only used to connect the redundant supervisors in
slots 1 and 2. Health messages get passed and image and
configuration synchronization access between the supervisor
modules are done over the internal IP network. The internal IP
network uses the internal network IP mask.
Multilayer Supervisor Conceptual Diagram
High-
Speed
Access
To /
From
Switch
Fabric
Wirespeed Routing
in Hardware
Software-based
Routing
System
management
Routing Table and
Cache Management
Manage-
ment
Inter-
faces
High-speed
CPU