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DES-7200 Configuration Guide Chapter 6 REUP Configuration
6-24
Active Interface Backup Interface State
---------------- ---------------- --------------------
Gi0/1 Gi0/2 Active down/Backup up
Interface Pair : Gi0/1, Gi0/2
Preemption Mode : bandwidth
Preemption Delay : 40 seconds
Bandwidth : Gi0/1(1000 Mbits), Gi0/2(100 Mbits)
As shown above, when the uplink on primary port of Switch E is failed, the backup port
will switch to forwarding state (UP) to transmit packets.
Step 3: Restore the uplink on the primary port of Switch D and then verify device state
After the uplink is restored and before the delay time runs out, immediately verify the
dual-link backup state of device. The primary port goes into Standby state, and the
secondary port remains in forwarding state, as shown below:
SwitchE#show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
----------------- ----------------- -----------------
Gi0/1 Gi0/2 Active Standby/Backup Up
After the 40-second delay time runs out, CLI will print the following LOG information:
*Apr 14 22:08:45: %REUP_INTF-5-PREEMPT: Preempting interface Gi0/2 in reup
pair (Gi0/1, Gi0/2), preemption mode is bandwidth
Verify the dual-link backup state of device again. Sicne REUP bandwidth based
preemption mode is configured, REUP will preempt the link with greater bandwidth
(namely the uplink on Gi0/1).
SwitchE#show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
---------------- ---------------- --------------------
Gi0/1 Gi0/2 Active Up/Backup Standby
Interface Pair : Gi0/1, Gi0/2
Preemption Mode : bandwidth
Preemption Delay : 40 seconds
Bandwidth : Gi0/1(1000 Mbits), Gi0/2(100 Mbits)
¾ Displaying REUP configurations on the upstream devices
Display information about MAC address update group on Switch A
SwitchA#show mac-address-table update group detail
Mac-address-table Update Group:1
Received mac-address-table update message count:5