Alcatel Carrier Internetworking Solutions Switch/Router 用户手册

Page 2-9

In order to provide greater reliability, Omni Switch/Router supports two 

MPX

s in a 

primary/secondary redundant configuration. If the primary 

MPX

 fails, the secondary 

MPX

 takes 

over without any operator intervention.

♦ Warning ♦

Do not install any version of the 

MPM

 (i.e, 

MPM-C

, 

MPM 1G

, 

MPM II

, or original 

MPM

) in a chassis with an 

MPX

. Installing an 

MPM

 in a chassis with an 

MPX

 can 

cause physical damage. If you want to configure an 
Omni Switch/Router chassis in a redundant configura-
tion, you must use two 

MPXs

.

When you have two 

MPX

s in one chassis, they must be installed in Slots 1 and 2, and only 

one can be active. 

MPX

s will assume one of the following roles.

• Primary - The 

MPX

 that is currently active and processing commands. It is also the 

MPX

 that 

is communicating via Telnet, 

FTP

, etc.

• Secondary - An 

MPX

 that is currently not the primary. It has sufficient software to commu-

nicate with the primary 

MPX

. (For full redundancy, the secondary 

MPX

 should also have 

the same software version as the primary and its configuration should be in sync with the 
primary.) In this state, it is capable at any time of assuming the primary role.

The 

LED

s on each 

MPX

 reflect the same status with the exception that the primary’s 

 

LED

 is 

on whereas the secondary’s 

 

LED

 is on. Also, the secondary 

MPX

’s 

 

LED

 will not flash 

LEDs

.

♦ Important Note ♦

To support redundancy, your 

MPX

 must be Revision 

A14 or higher.

The secondary 

MPX

 continuously monitors the primary 

MPX

. This monitoring serves two 

purposes: 1) to notify the secondary 

MPX

 that the primary is alive and processing, and 2) to 

update the configuration and thus keep the two 

MPX

s in sync. If the secondary 

MPX

 detects 

that the primary is no longer operational, it will begin to take over as primary. When a 
secondary 

MPX

 becomes primary it resets all the other modules in the chassis and performs a 

primary 

MPX

 initialization.

There are four states for an 

MPX

 configuration. You can view the current 

MPX

 state through 

the 

 command. These states are described in the table below. Note that for a 

primary/secondary configuration to be in a “redundant” state, the relationship between the 
two 

MPX

s must meet the conditions shown in the table.