H3C S9500E Series Configuration Manual page 119

a VF corresponding to this MAC address, and the router becomes the owner of the VF it has
created.
VF weight and priority
The weight of a VF indicates the forwarding capability of a router: the higher the weight, the
higher the forwarding capability. When the weight is lower than a specified value which is the
lower limit of failure, the router will not be capable of forwarding packets for hosts.
The priority of a VF decides the VF state: a VF with the highest priority is in the active state and is
known as the AVF, which forwards packets; other VFs are in the listening state and are known as
the LVFs, which listen to the state of the AVF. The priority value of a VF ranges from 0 to 255,
where 255 is reserved for the VF owner.
The priority value of a VF is calculated based on its weight.
VF backup
If the weight of the VF owner is no less than the lower limit of failure, the priority of the VF owner
is the highest value 255. Therefore, the VF owner is the AVF and forwards packets destined to the
MAC address of the AVF. After receiving the advertisements sent by the AVF, other routers in the
VRRP group create their own VFs, which are in the listening state. Figure 29 illustrates the VF
information on each router in the VRRP group.
Figure 29 VF information
LVFs listen to the AVF. When the AVF fails, the LVFs elect a new AVF with the highest priority
value among the LVFs.
A VF always works in the preemption mode. When an LVF finds its priority higher than that in the
advertisement sent by the AVF, the LVF declares itself as the AVF.
119