Netgear 7300S User Manual download pdf (Page 319)

User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software

Managing Switch Stacks 12-5

202-10088-01, March 2005

Stack Master Election and Re-Election

The stack master is elected or re-elected based on one of these factors and in the order listed:

1. The switch that is currently the stack master

2. The switch with the highest stack member priority value

Note: Netgear recommends assigning the highest priority value to the switch that you prefer to

be the stack master. This ensures that the switch is re-electedas stack master if a re-election

occurs.

3. The switch with the higher MAC address

A stack master retains its role unless one of these events occurs:

• The stack master is removed from the switch stack

• The stack master is reset or powered off

• The stack master has failed

• The switch stack membership is increased by adding powered-on standalone switches or

switch stacks

In the case of a master re-election, the new stack master becomes available after a few seconds. In

the meantime, the switch stack uses the forwarding tables in memory to minimize network

disruption. The physical interfaces on the other available stack members are not affected while a

new stack master is elected.

If a new stack master is elected and the previous stack master becomes available, the previous

stack master does not resume its role as stack master.

Stack Member Numbers

A stack member number (1 to 8) identifies each member in the switch stack. The member number

also determines the interface-level configuration that a stack member uses. You can display the

stack member number by using the show switch user EXEC command.

A new, out-of-the-box switch (one that has not joined a switch stack or has not been manually

assigned a stack member number) ships with a default stack member number of 1. When it joins a

switch stack, its default stack member number changes to the lowest available member number in

the stack.

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Netgear 7300S User Manual Page 319