Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 2126)

VCStack Introduction
Software Reference for x310 Series Switches
82.12 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
Automatically
selected virtual
address
If you set the stack virtual-mac command without entering a value for the stack
virtual-chassis-ID, the switch will randomly select a virtual-chassis-ID from the allocated
range.
Disabling the stack virtual-mac
When the stack virtual-mac command is disabled, the stack will use the MAC address of
the current Master. If the stack master fails, the stack MAC address changes to reflect the
new master's MAC address. If the stack MAC address does change, ARP tables of devices
on the network will update to reflect the change in MAC address via
ip gratuitous-arp-
link command on page 25.21 .
Stack Resiliency Link
The purpose of the resiliency link is to provide the stack members with status information
that allows them to detect whether the stack master is still operational after a stack failure
occurs.
Using the resiliency link, a stack member can differentiate between the master suffering a
power-down or a software lock-up, where the master is offline, compared with a stacking-
link failure, where the master is still online but connectivity over the stacking cables has
been lost.
This enables the other stack members to either operate in the fall-back Disabled Master
mode, or to re-elect a new stack master. The
“State Change Table” on page 82.12 shows
how the stack members respond to various problems occurring on the master node.
Stack recovery states
The following state-change-table shows stack member failure conditions and recovery
actions in situations where the resiliency link is present or absent. .
Table 82-1: State Change Table
Event on Master Node Reaction on Master
Reaction on Stack
Member Reaction on Stack
Member
With Resiliency Link
Without Resiliency
Link
Both stack links removed No change Disabled Master
Re-elect master
2
Hardware reset (or fault) Reset / offline Re-elect master
Re-elect master
2
Run the no stack enable
command
3
No change Disabled Master Disabled Master
Software application problem
(lock-up or continual crashes) Reboot as stack
member Re-elect master Re-elect master
Software crash or lock-up
Frozen
4 Re-elect master Re-elect master
Power-down or PSU failure Powered down Re-elect master Re-elect master
Event on Stack Member
Node
Reaction on Master
Reaction on Stack
Member Reaction on Stack
Member
Both stack links removed No change
Disabled Master
1
Re-elect master
2
Hardware reset (or fault) No change Reset/offline Reset/offline