15.2.2 Configuring Uplink Redundant
The figure below describes an example uplink redundancy configuration. This subsection describes how to configure uplink redundancy based on this example.
On the Switch, this configuration configures port 1/0/1 as the primary port and port 1/0/2 as the secondary port. It also specifies 60 seconds as the automatic switch-back wait time and enables the sending of flush control frames.
- <Structure of this section>
(1) Configuring Uplink Redundant
- Points to note
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Configure port 1/0/1 as the primary port and port 1/0/2 as the secondary port. Specify 60 seconds as the automatic switch-back wait time. You need to disable Spanning Tree Protocols before you configure uplink redundancy. Configure the sending of flush control frames on the primary port.
Command examples
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(config)# spanning-tree disable
Disables a Spanning Tree Protocol.
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(config)# interface gigabitethernet 1/0/1
(config-if)# switchport backup interface gigabitethernet 1/0/2 preemption-delay 60
Enters configuration mode for port 1/0/1.
In the configuration mode of port 1/0/1 as the primary port, configure port 1/0/2 as the secondary port. Also, set the automatic switch-back wait time to 60 seconds.
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(config-if)# switchport backup flush-request transmit
(config-if)# exit
Enables the sending of flush control frames.
- Notes
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Before you configure uplink redundancy, the network is in a loop configuration. Shut down the primary port or the secondary port to prevent loops, and then set up the configuration.
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If you want to specify the ports in a link aggregation group as the primary port, use a port channel interface. You cannot use an Ethernet interface in a link aggregation group as the primary port.
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