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DES-7200 Configuration Guide Chapter 6 REUP Configuration
6-20
Fig 12 Topological diagram for REUP configuration
6.4.2 Application Requirements
When downstream devices are connected to upstream devices, service interruption
may be easily caused by the single point failure on the single upstream link. Generally,
dual upstream links are used. One downstream device (Switch D/E) is connected to
two upstream devices (Switch B and Switch C) to furthest avoid single point failure and
enhance network reliability. The specific requirements are shown below:
1. Downstream devices (Switch D/E) reach the upstream device (Switch A) through
two upstream links to realize redundant backup of the link.
2. Downstream devices (Switch D/E) shall allow rapid bidirectional convergence in
the case of link failure.
3. G0/2 of Switch E is a 100M interface, and G0/1 is a 1000M interface. When the
failed link is restored, the upstream link with greater bandwidth shall be selected.
6.4.3 Configuration Tips
Applying REUP will meet all the above application needs:
1. Configure REUP dual-link backup on downstream devices (Switch D/E) to allow
redundant backup of the primary link and backup link.
2. Configure REUP MAC address update on the corresponding devices to achieve
rapid bidirectional convergence of the network: enable the downstream devices
(Switch D/E) to send MAC address update messages; enable the upstream
devices (Switch A/B/C) to receive MAC address update messages and join all
ports into the same address update group.
3. Configure REUP preemption mode to enable the priority use of upstream link with
greater bandwidth.
6.4.4 Configuration Steps
Trunk links are used to connect devices. For interface related configurations, please
refer to "Interface Configuration" section in this manual.
¾ Configurations on Switch D
Step 1: Configure REUP pair (Gi0/1 is the primary port and Gi0/2 is the secondary port)
SwitchD > enable
SwitchD # configure terminal
SwitchD (config)# interface GigabitEthernet 0/1
SwitchD(config-if-GigabitEthernet 0/1)# switchport mode trunk