H3C Technologies H3C S7500E Series Switches - Manual (Page 198)

12-17
Config Pri : 100 Running Pri : 100
Preempt Mode : Yes Delay Time : 0
Auth Type : None
Virtual IP : 192.168.0.10
Virtual MAC : 0000-5e00-0101
Master IP : 192.168.0.102
The above output indicates that when Switch A detects that the uplink fails through BFD, it decreases
its priority by 20 to ensure that Switch B can preempt as the master.
Static Routing-Track-NQA Collaboration Configuration Example
Network requirements
As shown in Figure 12-5 , Switch A, Switch B, Switch C, and Switch D are connected to two segments
20.1.1.0/24 and 30.1.1.0/24. Configure static routes on these switches so that the two segments can
communicate with each other, and configure route backup to improve reliability of the network.
Switch A is the default gateway of the hosts in segment 20.1.1.0/24. Two static routes to 30.1.1.0/24
exist on Switch A, with the next hop being Switch B and Switch C respectively. These two static routes
back up each other, where:
z The static route with Switch B as the next hop has a higher priority, and is the master route. If this
route is available, Switch A forwards packets to 30.1.1.0/24 through Switch B.
z The static route with Switch C as the next hop acts as the backup route.
z Configure static routing-track-NQA collaboration to determine whether the master route is
available in real time. If the master route is unavailable, the backup route takes effect, and Switch
A forwards packets to 30.1.1.0/24 through Switch C.
Similarly, Switch D is the default gateway of the hosts in segment 30.1.1.0/24. Two static routes to
20.1.1.0/24 exist on Switch D, with the next hop being Switch B and Switch C respectively. These two
static routes back up each other, where:
z The static route with Switch B as the next hop has a higher priority, and is the master route. If this
route is available, Switch D forwards packets to 20.1.1.0/24 through Switch B.
z The static route with Switch C as the next hop acts as the backup route.
z Configure static routing-track-NQA collaboration to determine whether the master route is
available in real time. If the master route is unavailable, the backup route takes effect, and Switch
D forwards packets to 20.1.1.0/24 through Switch C.