H3C Technologies H3C MSR 5600 - Manual (Page 18)

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• Redirect timer—Before this timer expires, the master still uses the virtual MAC address
corresponding to the failed AVF to respond to ARP/ND requests from hosts, and the VF owner can
share traffic load if the VF owner resumes normal operation within this time. When this timer expires,
the master stops using the virtual MAC address corresponding to the failed AVF to respond to
ARP/ND requests from hosts.
• Timeout timer—The duration after which the new AVF takes over responsibilities of the failed VF
owner. Before this timer expires, all routers in the VRRP group keep the VFs that correspond to the
failed AVF, and the new AVF forwards packets destined for the virtual MAC address of the failed
AVF. When this timer expires, all routers in the VRRP group remove the VFs that correspond to the
failed AVF, including the new AVF. Packets destined for the virtual MAC address of the failed AVF
are not forwarded any longer.
VF tracking
An AVF forwards packets destined for the MAC address of the AVF. If the upstream link of the AVF fails
but no LVF takes over the AVF role, the hosts on the subnet that use the MAC address of the AVF as their
gateway MAC address cannot access the external network.
The VF tracking function can solve this problem. You can use NQA or BFD to monitor the upstream link
state of the VF owner, and establish the collaboration between the VFs and NQA or BFD through the
tracking function. When the upstream link fails, the state of the track entry changes to Negative, and the
weights of the VFs (including the AVF) on the router decrease by a specified value. The corresponding LVF
with a higher priority on another router becomes the AVF and forwards packets.
Protocols and standards
• RFC 3768, Virtual Router Redundancy Protocol (VRRP)
• RFC 5798, Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6
Configuring IPv4 VRRP
IPv4 VRRP configuration task list
Tasks at a glance Remarks
(Required.) Specifying an IPv4 VRRP operating mode N/A
(Optional.) Specifying the IPv4 VRRP version N/A
(Required.) Creating a VRRP group and assigning a virtual IP address N/A
(Optional.) Configuring the router priority, preemptive mode, and tracking
function
N/A
(Optional.) Configuring IPv4 VRRP packet attributes N/A
(Optional.) Configuring VF tracking
This configuration applies to only
VRRP load balancing mode.
(Optional.) Enabling SNMP notifications for VRRP N/A
(Optional.) Disabling an IPv4 VRRP group N/A