3Com 6416SW manual Switch/Control, Role, ONcore Switching Hub/CELLplex, Reference Guidefor details

ATM

Switch/Control

Redundancy

By

installing

a

second

6416SW in a 17-slot hub, a backup to

the

active

6416SW

is

provided (check the Release Notes for the level of 6416SW

and

the level

of

code

required). If the active 6416SW fails,

the

standby

will

take

over

control.

The

active

6416SW continually updates the tables in

the standby 6416SW to ensure that

the

backup

configuration is

current,

and

to

reduce the impact should a switch

to

the

stan

be required. The active 6416SW checks

every

one

second

to

determine

if

the

standby

6416SW

is

present

and

up-to-date. The date

and

time

are

also

updated

to

ensure

network

time

consistency

in case of switch-over.

The active 6416SW also periodically requests that the standby 6416SW perform

diagnostics to ensure that it is capable

of

assuming

control

if

required.

Which 6416SW is to be active can be defined by the operator in both

Maintenance

and

Administrator

modes,

via

the

SET

ROLE

or

SET DEVICE ROLE command (see the

ONcore

Switching

Hub/CELLplex

4000

ATM

Command

Reference Guidefor details).

This choice is considered at

next

reset

when

electing

the

active

6416SW.

Maintenance

mode

can

be

entered

for

the

backup

6416SW,

but

this mode

will

be

ended

should the

active

6416SW

fail

or

enter

Maintenance

mode.

Note: The standby 6416SW does not support Telnet. There are two console modes

available,

basic

dialog

mode

and

maintenance

mode.

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