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DES-7200 Configuration Guide Chapter 6 REUP Configuration
6-23
Gi4/1 Gi4/2 Active down/Backup up
Interface Pair : Gi4/1, Gi4/2
Preemption Mode : Off
Preemption Delay : 35 seconds
Bandwidth : Gi4/1(1000 Mbits), Gi4/2(1000 Mbits)
As shown above, when the uplink on primary port of Switch D 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
SwitchD#show interfaces switchport backup detail
Switch Backup Interface Pairs:
Active Interface Backup Interface State
---------------- ---------------- --------------------
Gi4/1 Gi4/2 Active Standby /Backup up
Interface Pair : Gi4/1, Gi4/2
Preemption Mode : Off
Preemption Delay : 35 seconds
Bandwidth : Gi4/1(1000 Mbits), Gi4/2(1000 Mbits)
As shown above, since REUP preemption mode hasn't been configured on Switch D,
when the uplink on primary port is restored, the secondary port will still maintain
forwarding state and the primary port will go into standby state.
¾ Displaying REUP configurations on Switch E
Step 1: Display the dual-link backup state of ports on Switch E
SwitchE#show interfaces switchport backup detail
Switch Backup Interface Pairs:
Active Interface Backup Interface State
---------------- ---------------- --------------------
Gi4/1 Gi4/2 Active Up/Backup Standby
Interface Pair : Gi0/1, Gi0/2
Preemption Mode : bandwidth //REUP bandwidth based preemption mode
Preemption Delay : 40 seconds
Bandwidth : Gi0/1(1000 Mbits), Gi0/2(100 Mbits)
As shown above, when links function normally (both primary and secondary ports of
Switch E are Link Up), the secondary port of Switch E will maintain Standby state.
Step 2: Disconnect the uplink on the primary port of Switch E and then verify device
state
SwitchD#show interfaces switchport backup detail
Switch Backup Interface Pairs: