Linksys SLM224G4S Manuel d'utilisateur télécharger pdf (Page 63)

About Switch Stacking

Appendix B

24/48-Port 10/100 + 4-Port Gigabit Resilient Clustering Smart Switch with 2 Combo SFPs

It should be emphasized that when two stacks are

combined, all of the configuration information for one of

the stacks will be lost. Only the surviving master (after the

discovery/election process completes) will maintain its

configuration information.

The best practice to combine two stacks is to reset the

switches in one stack to the factory defaults and then

add the switches as described in the “Adding Units to

a Running Stack” subsection of section “Normal (Self-

Ordering) Stack).”

If one of the merged stacks had neither a Master unit

nor a Backup Master unit, then units belonging to

this group will be inserted into the stack in the exact

way as described in section “Replacing a Failed Stack

Member in a Running Stack” above. The Master will

either connect the running units to the stack using the

current numbers or will renumber them as necessary.

The process described in section ““Replacing a Failed

Stack Member in a Running Stack” applies to this case

as well.

It should be emphasized that any time two stacks are

combined into one stack, there is no way to maintain

the configuration for both sets of switches. All dynamic

information of the units that belong to the portion of

the stack that was not reelected to be the master will be

relearned.

Stacking Cable Failure

In this example, let us assume that stacking connection

cables failed and caused a stack split, as described in

section “Splitting a Stack.” When the stacking cable

connection is fixed and units are reconnected, it results in

merging two stacks as described in section “Merging Two

Stacks.”

This scenario is feasible only if the topology of the stack

is Chain topology. Single stacking cable failure will not

cause a stack split if a Ring topology is used.

Inserting Too Many Units

In this example, a user tries to insert too many units into

a stack.

All units (existing and newly inserted) are powered on

at the same time:

A Master is elected following the Master Discovery

and Master Election processes.

All other units will shut down.

NOTE: In some extreme cases, due to a race

condition during the boot process, some of the

units might be connected and join the stack.

•

A running group of units is added to an existing stack,

assuming each one of the stack groups has an elected

Master. The total of existing units and inserted units

would exceed the maximum allowed number of units

in a stack, which is 6 units for SLM224G4S, or 4 units

for SLM248G4S:

Master Detection and Master Election processes

would determine the master out of one of two

combined stacking groups.

When switches are added to a running stack,

the Unit ID Allocation and Duplicate ID Conflict

Resolution process will detect an error if too many

switches are present in the stack, and no changes

will be made to units that originally belonged

to the group managed by the newly elected

master. The original switches will retain their ID

assignments and configurations. The units that

originally belonged to the group managed by

the master that lost its master status will be shut

down.

Standalone Unit Inserted into a Running Stack

Since the unit is in standalone mode it will not participate

in a master discovery process (it will not look for a master

and will not respond to master queries). As a result it will

not join the stack but will continue to run as a standalone

manageable unit.

The ports that are connected to the other units’ stacking

links will not pass any traffic, and the master will consider

them as failed stacking links and route all traffic around

them.

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Linksys SLM224G4S Manuel d'utilisateur Page 63

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