H3C Technologies H3C S12500 Series Switches - Manual (Page 166)

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Run Mode : Standard
Run Method : Virtual MAC
Total number of virtual routers : 1
Interface Vlan-interface2
VRID : 1 Adver Timer : 1
Admin Status : Up State : Master
Config Pri : 100 Running Pri : 100
Preempt Mode : Yes Delay Time : 5
Auth Type : None
Virtual IP : 202.38.160.111
Virtual MAC : 0000-5e00-0101
Master IP : 202.38.160.2
The output shows that when Switch A fails, Switch B becomes the master, and packets sent from
Host A to Host B are forwarded by Switch B.
# After Switch A resumes normal operation, use the display vrrp verbose command to display the
detailed information of VRRP group 1 on Switch A.
[SwitchA-Vlan-interface2] display vrrp verbose
IPv4 Standby Information:
Run Mode : Standard
Run Method : Virtual MAC
Total number of virtual routers : 1
Interface Vlan-interface2
VRID : 1 Adver Timer : 1
Admin Status : Up State : Master
Config Pri : 110 Running Pri : 110
Preempt Mode : Yes Delay Time : 5
Auth Type : None
Virtual IP : 202.38.160.111
Virtual MAC : 0000-5e00-0101
Master IP : 202.38.160.1
The output shows that after Switch A resumes normal operation, it becomes the master, and
packets sent from host A to host B are forwarded by Switch A.
VRRP interface tracking configuration example
Network requirements
Host A wants to access Host B on the Internet, using 202.38.160.111/24 as its default gateway.
Switch A and Switch B belong to VRRP group 1 with the virtual IP address of 202.38.160.111/24.
If Switch A operates correctly, packets sent from Host A to Host B are forwarded by Switch A. If
VLAN-interface 3 through which Switch A connects to the Internet is not available, packets sent from Host
A to Host B are forwarded by Switch B.
To prevent attacks to the VRRP group from illegal users by using spoofed packets, configure the
authentication mode as plain text to authenticate the VRRP packets in VRRP group 1, and specify the
authentication key as hello.