Protocols And Standards; Configuring Ipv4 Vrrp; Ipv4 Vrrp Configuration Task List - HP MSR Series Configuration Manual

A VF always operates in preemptive mode. When an LVF finds its priority value higher than the one
advertised by the AVF, the LVF declares itself as the AVF.
VF timers
When the AVF on a router fails, the new AVF on another router creates the following timers for the failed
AVF:
• 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. 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. 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 AVF's upstream link fails but no
LVF takes over, the hosts that use the AVF's MAC address 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 associate the VFs with NQA or BFD through the tracking function. This enables
the collaboration between VRRP and NQA or BFD through the Track module. When the upstream link
fails, the state of the track entry changes to Negative. The weights of the VFs (including the AVF) on the
router decrease by a specific 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

VRRP cannot be configured on member ports of aggregation groups.

IPv4 VRRP configuration task list

Tasks at a glance
(Required.) Specifying an IPv4 VRRP operating mode
(Optional.) Specifying the IPv4 VRRP version
(Required.) Creating a VRRP group and assigning a virtual IP address
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Remarks
N/A
N/A
N/A