Chapter 18
| Configuring Router Redundancy
Configuring VRRP Groups
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â—† You can add a delay to the preempt function to give additional time to receive
an advertisement message from the current master before taking control. If the
router attempting to become the master has just come on line, this delay also
gives it time to gather information for its routing table before actually
preempting the currently active master router.
Parameters
These parameters are displayed:
Adding a VRRP Group
◆ VRID – VRRP group identifier. (Range: 1-255)
◆ VLAN – ID of a VLAN configured with an IP interface. (Range: 1-4094; Default: 1)
Adding a Virtual IP Address
◆ VLAN ID – ID of a VLAN configured with an IP interface. (Range: 1-4094)
◆ VRID – VRRP group identifier. (Range: 1-255)
◆ IP Address – Virtual IP address for this group.
Use the IP address of a real interface on this router to make it the master virtual
router for the group. Otherwise, use the virtual address for an existing group to
make it a backup router, or to compete as the master based on configured
priority if no other members are set as the owner of the group address.
Configuring Detailed Settings
◆ VLAN ID – VLAN configured with an IP interface. (Range: 1-4094)
◆ VRID – VRRP group identifier. (Range: 1-255)
◆ Advertisement Interval – Interval at which the master virtual router sends
advertisements communicating its state as the master. (Range: 1-255 seconds;
Default: 1 second)
VRRP advertisements from the current master virtual router include
information about its priority and current state as the master.
VRRP advertisements are sent to the multicast address 224.0.0.8. Using a
multicast address reduces the amount of traffic that has to be processed by
network devices that are not part of the designated VRRP group.
If the master router stops sending advertisements, backup routers will bid to
become the master router based on priority. The dead interval before
attempting to take over as the master is three times the hello interval plus half a
second.
◆ Priority – The priority of this router in a VRRP group. (Range: 1-254;
Default: 100)
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The priority for the VRRP group address owner is automatically set to 255.
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