H3C Technologies H3C SecBlade LB Cards - Manual (Page 108)

100
The output shows that when a fault is on the link between LB A and Router A, the priority of LB A
decreases to 80. LB A becomes the backup, and LB B becomes the master. Packets from Host A to
Host B are forwarded through LB B.
Static routing-Track-NQA collaboration configuration example
Network requirements
As shown in Figure 44 , LB A, LB B, Router A, and Router B are connected to two segments 20.1.1.0/24
and 30.1.1.0/24. Configure static routes on LB devices so that the two segments can communicate with
each other. Configure route backup to improve network reliability.
LB 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
LB A, with the next hop being Router A and Router B, respectively. These two static routes back up each
other, where:
• The static route with Router A as the next hop has a higher priority, and is the master route. If this
route is available, LB A forwards packets to 30.1.1.0/24 through Router A.
• The static route with Router B as the next hop acts as the backup route.
• 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 LB A
forwards packets to 30.1.1.0/24 through Router B.
Similarly, LB B 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 LB B, with the next hop being Router A and Router B, respectively. These two static routes back
up each other, where:
• The static route with Router A as the next hop has a higher priority, and is the master route. If this
route is available, LB B forwards packets to 20.1.1.0/24 through Router A.
• The static route with Router B as the next hop acts as the backup route.
• 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 LB B
forwards packets to 20.1.1.0/24 through Router B.
Figure 44 Network diagram