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Chapter 2: VCStack Overview
40
Resiliency Link
The resiliency link carries no network data. Its function is to provide
additional stack status information to enable the stack members to more
accurately decide whether it is appropriate for one of them to take over the
role of stack master if the existing master fails.
A resiliency link can be created using a single physical connection
between two eth0 (NET MGMT) ports, or it can use a VLAN (resiliency link
VLAN) to which the switch ports can be attached.
To create a resiliency link using eth0 (NET MGMT) ports, connect a
standard twisted pair LAN cable (either straight through, or crossover—
MDI-MDIX negotiation is supported on these ports) between the two eth0
(NET MGMT) ports on both devices. Once you have connected the cable,
you can run the STACK RESILIENCYLINK command to create the
resiliency link.
Resiliency Link Configurations via Switch Ports
Two resiliency-link configurations that use switch ports are shown below.
Figure 14 shows the resiliency link connecting in a ring topology, while
Figure 15 on page 41 shows the resiliency link connecting to the switch
ports via a network hub. In both configurations, the resiliency link
connections are made using a designated VLAN running over switch-port
connections between each stack member. For more information on using
the resiliency link commands, refer to the STACK RESILIENCYLINK and
SWITCHPORT RESILIENCYLINK commands in the AT-DC2552XS / L3
Management Software Command Line Interface User's Guide.
DC2552XS/L3
DC2552XS/L3
Figure 14. Resiliency Link Connecting to Switch Ports Over the Resiliency
Link VLAN
DC2552XS/L3
DC2552XS/L3
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