Resiliency Link; Vcstack Recovery States; Figure 24. Vcs Ring Topology Using X600 Switches - Allied Telesis x600-48Ts Installation Manual

Chapter 2: Virtual Chassis Stacking
100-240VAC~
100-240VAC~

Resiliency Link

VCStack
Recovery States
52
Ring Configuration
A virtual stack using x600 switches can comprise up to 4 stack members
connected in a ring topology. Figure 24 shows a ring comprising 3 stacked
x600 series switches. Because an alternate path is provided between the
stack members, this topology offers a very resilient configuration
RPS INPUT
100-240VAC~

Figure 24. VCS Ring Topology Using x600 Switches

Stack Resiliency Link
The purpose of the resiliency link is to provide the stack members with
status information that enables them to detect whether the stack master is
still operational after it has suffered either a power-down or software lock-
up. This enables the other stack members to either operate in the fall-back
mode, or to re-elect a new stack master. The state change table,Table 11,
"State Change Table" on page 53 shows how the stack members respond
to various problems occurring on the master node.
A resiliency link operates using a resiliency link VLAN to which resiliency
link switch ports can become members.
The following state-change-table shows stack member failure conditions
and recovery actions in situations where the resiliency link is present or
absent.
AT-StackXG AT-StackXG
STACK PORT 1 STACK PORT 2
High Speed Stacking Cables
Model Number AT-StackXG/0.5
(0.5 metres)
AT-StackXG AT-StackXG
RPS INPUT
STACK PORT 1
High Speed Stacking Cables
Model Number AT-StackXG/0.5
AT-StackXG
RPS INPUT
High Speed Stacking Cables
Model Number AT-StackXG/0.5
(0.5 meters) as supplied or
Model Number AT-StackXG/1
(1.0 meter)
STACK PORT 2
(0.5 metres)
STACK PORT 1 STACK PORT 2