Filter
Top Products
DES-7200 Configuration Guide Chapter 2 VRRP Plus Configuration
2-3
threshold, it will automatically quit the forwarding role. When the weighting
value recovers and is beyond the upper threshold, it will automatically resume
the forwarding role.
VRRP Plus supports the linkage with link detection protocol and weighting
value adjustment as per link status. Each device in the backup group can
associate with the corresponding link status. When a certain link fails, the
device will automatically decrease its weighting value; if the weighting value is
too low, it will quit the forwarding role. If the backup group is using the
weighted load balancing policy, it can then allocate the corresponding traffic
according to the new weighting value. When the associated link status
recovers, this device will automatically recover the weighting value and
resume the forwarding role. As for the backup group adopting weighted load
balancing policy, it will allocate the traffic from different hosts according to the
weighting value after recovery.
VRRP Plus supports the feature of forwarder preemption. VRRP Plus can only
support up to four devices participating in load balancing, namely one VRRP
Plus backup group will have four virtual MAC addresses at the most. When
additional devices join a VRRP Plus group, only four devices will participate in
packet forwarding, while the remaining devices will only listen to the status of
other devices. The remaining devices will replace forwarder devices and
forward packets only if they fail. When there are already four devices forming
a VRRP Plus backup group and forwarding packets, if the fifth device joins the
VRRP Plus group and boasts better forwarding capacity, or if the forwarding
capacity of one original forwarder is reduced due to link failure, the fifth device
will preempt the device with lower weighting value (lower forwarding capacity)
if preemption function is enabled. Configure higher weighting value for
device with better forwarding capacity, so that when the device in listening
mode has a weighting value higher than that of the existing forwarder, the
listening device can preempt the role of such forwarder. In this way, device
with better forwarding capacity will be responsible for packet forwarding and
device with lower forwarding capacity will listen to the status of other devices,
thus reducing the waste of resources. Since the BVG device in the backup
group is responsible for virtual MAC address assignment, the BVG role cannot
be preempted. Only the forwarder role of BVFs can be preempted.
If BVG device fails, VRRP will reelect the Master and BVG will be generated
on the new Master device.
After VRRP Plus is configured, ARP requests received from hosts will be
replied according to different load balancing policies to allow load balancing of
these hosts. However, hosts having learned the virtual gateway address of
VRRP before VRRP Plus is configured will not participate in load balancing.
Therefore, if VRRP Plus is configured after VRRP status is switched to Master,
the load balancing cannot be truly achieved before the aging of the ARP