H3C Technologies H3C S12500 Series Switches - Manual (Page 236)

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127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0
The output shows the BFD detection result: the next hop 10.2.1.2 is unreachable (the status of the
track entry is Negative), and the backup static route takes effect, and Switch A forwards packets
to 30.1.1.0/24 through Switch C and Switch B.
# When the master route fails, the hosts in 20.1.1.0/24 can still communicate with the hosts in
30.1.1.0/24.
[SwitchA] ping -a 20.1.1.1 30.1.1.1
PING 30.1.1.1: 56 data bytes, press CTRL_C to break
Reply from 30.1.1.1: bytes=56 Sequence=1 ttl=254 time=2 ms
Reply from 30.1.1.1: bytes=56 Sequence=2 ttl=254 time=1 ms
Reply from 30.1.1.1: bytes=56 Sequence=3 ttl=254 time=1 ms
Reply from 30.1.1.1: bytes=56 Sequence=4 ttl=254 time=2 ms
Reply from 30.1.1.1: bytes=56 Sequence=5 ttl=254 time=1 ms
--- 30.1.1.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 1/1/2 ms
# The output on Switch B is similar to that on Switch A. When the master route fails, the hosts in
30.1.1.0/24 can still communicate with the hosts in 20.1.1.0/24.
[SwitchB] ping -a 30.1.1.1 20.1.1.1
PING 20.1.1.1: 56 data bytes, press CTRL_C to break
Reply from 20.1.1.1: bytes=56 Sequence=1 ttl=254 time=2 ms
Reply from 20.1.1.1: bytes=56 Sequence=2 ttl=254 time=1 ms
Reply from 20.1.1.1: bytes=56 Sequence=3 ttl=254 time=1 ms
Reply from 20.1.1.1: bytes=56 Sequence=4 ttl=254 time=1 ms
Reply from 20.1.1.1: bytes=56 Sequence=5 ttl=254 time=1 ms
--- 20.1.1.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 1/1/2 ms
VRRP-Track-interface management collaboration configuration
example (the master monitors the uplink interface)
Network requirements
As shown in Figure 56 , Host A needs to access Host B on the Internet. The default gateway of Host A is
10.1.1.10/24. Switch A and Switch B belong to VRRP group 1, whose virtual IP address is 10.1.1.10.
When Switch A works correctly, packets from Host A to Host B are forwarded through Switch A. When
VRRP detects that a fault is on the uplink interface of Switch A through the interface management module,
packets from Host A to Host B are forwarded through Switch B.