C613-50100-01 REV C Command Reference for x930 Series 2456
AlliedWare Plus™ Operating System - Version 5.4.6-1.x
VIRTUAL CHASSIS STACKING (VCSTACK™) COMMANDS
STACK
RESILIENCYLINK
stack resiliencylink
Overview This command configures the resiliency link used by the stack. The interface used
may be either an eth port or is a dedicated VLAN (resiliencylink VLAN) to which
switch ports may become members. This VLAN is dedicated to the resiliency link
function and must not be the stack management VLAN.
Syntax
stack resiliencylink <interface>
no stack resiliencylink
Mode Global Configuration
Usage The resiliency-link is only used when a backup member loses connectivity with the
master via the stacking cables. Such a communication loss would occur if:
• a stacking link is removed or fails
• two or more stacking link cables are unplugged or fail
• the stack master itself fails due to a reboot or power failure
The resiliency-link allows the backup member to determine if the master is still
present in the network by the reception of healthcheck messages sent by the
master over the resiliency-link interface.
Reply healthcheck messages are received if the master is still online, but the stack
will now split into two different “stubs”. The stub containing the existing master
will continue operating as normal. The members in the masterless stub will now
use a “type stack disabled-master” trigger to run a configuration to form a second
temporary stack. This utilizes the remaining stack members' resources without
conflicting directly with the master's configuration. If no “type stack
disabled-master” trigger was configured on the switches, then the masterless stub
members will disable their switch ports.
If no healthcheck messages are received, then the master is assumed to be
completely offline, and so the other stack members can safely take over the
master's configuration.
CAUTION: The purpose of the resiliency link is to enable the stack members (particularly
the backup master) to check the status of the master under fault conditions. If the
resiliency link is not configured, and the master loses communication with its other
stack members, then the stack will assume the master is NOT present in the network,
which could cause network conflicts if the master is still online. Note that this is a
change to the stacking of releases prior to version 5.3.1.
Example To set the resiliency link to be VLAN 4093.
Parameters Description
<interface> The name of the interface that is connected to the resiliency
link.
This may be either the eth port or the resiliencylink VLAN.
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