H3C Technologies H3C SR8800 - Manual (Page 60)

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is higher than or equal to the lower limit of failure—the lower limit is 10, the priority value of the VF owner
is 255.
The priority value of a VF is calculated based on its weight:
• If the weight of a VF is higher than or equal to the lower limit of failure, and the router where the VF
resides is the owner of the VF, the priority value of the VF is 255.
• If the weight of a VF is higher than or equal to the lower limit of failure, but the router where the VF
resides is not the owner of the VF, the priority value of the VF is weight/(number of local AVFs +1)
• If the weight of a VF is lower than the lower limit of failure, the priority value of the VF is 0.
VF backup
The VFs corresponding to a virtual MAC address on different routers in the VRRP group back up one
another.
Figure 19 VF information
Figure 19 illustrates the VF information on each router in the VRRP group and how the routers back up one
another. The master, Router A, assigns virtual MAC addresses 000f-e2ff-0011, 000f-e2ff-0012, and
000f-e2ff-0013 to itself, Router B, and Router C respectively. The VFs corresponding to these three virtual
MAC addresses, VF 1, VF 2, and VF 3, are created on each of the three routers, and the VFs
corresponding to the same virtual MAC address on different routers back up one another. For example,
VF 1 on Router A, Router B, and Router C can implement backup.
• Router A is the owner of VF 1, and the priority value of VF 1 on Router A is 255. In this case, VF 1
on Router A acts as the AVF to forward the packets destined for virtual MAC address
000f-e2ff-0011.
• The priority value of VF 1 on Router B and Router C is weight/(number of local AVFs + 1), that is,
255/(1 + 1) =127, which is lower than that of VF 1 on Router A. In this case, VF 1 on both Router
B and Router C acts as the LVF to listen to the status of VF 1 on Router A.
• When VF 1 on Router A fails, VF 1 on Router B and Router C elects the one with a higher priority
value as the new AVF, responsible for forwarding the packets destined for virtual MAC address
000f-e2ff-0011.