Users Guide

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1 Standby online S5000 S5000 9-0-1-0

2 Management online S5000 S5000 9-0-1-0

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Virtual IP

You can manage the stack using a single IP, known as a virtual IP, that is retained in the stack even after a

failover.

The virtual IP address is used to log in to the current master unit of the stack. Both IPv4 and IPv6 addresses

are supported as virtual IPs.

Use the following command to configure a virtual IP: Dell(conf)#virtual-ip {ip-address | ipv6–

address | dhcp}

Failover Roles

If the stack master fails (for example, is powered off), it is removed from the stack topology.

The standby unit detects the loss of peering communication and takes ownership of the stack management,

switching from the standby role to the master role. The distributed forwarding tables are retained during the

failover, as is the stack MAC address. The lack of a standby unit triggers an election within the remaining units

for a standby role.

After the former master switch recovers, despite having a higher priority or MAC address, it does not recover

its master role but instead takes the next available role.

MAC Addressing

All port interfaces in the stack use the MAC address of the management interface on the master switch. The

MAC address of the chassis in which you use the master switch as the stack MAC address.

The stack continues to use the master’s chassis MAC address even after a failover. The MAC address is not

refreshed until the stack is reloaded and a different unit becomes the stack master.

NOTE: If the removed management unit is brought up as a standalone unit or as part of a different stack,

there is a possibility of MAC address collisions. If you add a standalone unit, which has the same priority as

the master stack unit, the standalone unit joins the stack as a member unit.

Stacking 1012