Vrrp Tracking; Operation Procedure Of Vrrp - H3C S5600 Series Operation Manual

Operation Manual – VRRP
H3C S5600 Series Ethernet Switches

1.1.4 VRRP Tracking

Note:
If an IP address owner exists in a VRRP group, you can configure a priority for the IP
address owner. However your configuration will not take effect and the IP address
owner will still be the master of the VRRP group because the system considers the
priority of the IP address owner to be 255 always.
If an IP address owner exists in a VRRP group, the interface/port tracking function
configured on the IP address owner cannot take effect.
I. Interface tracking function of the VRRP group
When the VLAN interface of the master goes down, if you want the specified backup to
become the master, you can use the interface tracking function. With this function
enabled for the VRRP group:
If the tracked VLAN interface of the master goes down, the priority of the switch
decreases automatically by a specified value.
The decrease of the master priority makes the priority of the backup tracking the
interface become higher, and thus the backup becomes the new master.
II. Port tracking function of the VRRP group
When a physical port of the master goes down, if you want the specified backup to
become the master, you can use the port tracking function. With this function enabled
for the VRRP group:
If the tracked physical port of the master goes down, the priority of the master
decreases automatically by a set value.
The decrease of the master priority makes the priority of the backup tracking the
port become higher, and thus the backup becomes the new master.

1.1.5 Operation Procedure of VRRP

With VRRP enabled, the switches determine their respective roles in a VRRP
group by priority. The switch with the highest priority acts as the master, which will
forward packets to outside networks, and the switches with lower priorities act as
backups. The master sends VRRP advertisements periodically to notify that it is
operating normally.
When a backup receives a VRRP advertisement, it compares its own priority with
that in the advertisement. If its priority is lower, it remains as a backup. Otherwise,
it becomes the master.
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Chapter 1 VRRP Configuration