VRRP
Router Configuration Guide 409
Special Cases Assigning the Virtual Router ID IP Address — Once the vrid is created on the parent IP
interface, IP addresses need to be assigned to the virtual router instance. If the vrid was
created with the keyword owner, the virtual router instance IP addresses must have one or
more of the parent IP interface defined IP addresses (primary and secondary). For non-owner
virtual router instances, the virtual router IP addresses each must be within one of the parental
IP interface IP address defined local subnets. For both owner and non-owner virtual router
instances, the virtual router IP addresses must be explicitly defined using the backup ip-addr
command.
Virtual Router Instance IP Address Assignment Conditions — The RFC does not specify
that the assigned IP addresses to the virtual router instance must be in the same subnet as the
parent IP interface primary IP address or secondary IP addresses. The only requirement is that
all virtual routers participating in the same virtual router instance have the same virtual router
IP addresses assigned. To avoid confusion, the assigned virtual router IP addresses must be
in a local subnet of one of the parent IP interfaces IP addresses. For owner virtual router
instances the assigned virtual router IP address must be the same as one of the parental IP
interface primary or secondary IP addresses.
The following rules apply when adding, changing, or removing parental and virtual router IP
addresses:
Owner Virtual Router IP Address Parental Association — When an IP address is assigned to
an owner virtual router instance, it must be associated with one of the parental IP interface-
assigned IP addresses. The virtual router IP address must be equal to the primary or one of
the secondary IP addresses within the parental IP interface.
Non-Owner Virtual Router IP Address Parental Association — When an IP address is
assigned to a non-owner virtual router instance, it must be associated with one of the parental
IP interface assigned IP addresses. The virtual router IP address must be a valid IP address
within one of the parental IP interfaces local subnet. Local subnets are created by the primary
or secondary IP addresses in conjunction with the IP addresses mask. If the defined virtual
router IP address is equal to the associated subnet’s broadcast address, it is invalid. Virtual
router IP addresses for non-owner virtual router instances that are equal to a parental IP
interface IP address are also invalid.
Table 33: Example - Owner Virtual Router Instance
Parent IP addresses: 10.10.10.10/24
11.11.11.11/24
Virtual router IP addresses: 10.10.10.11 Invalid (not equal to parent IP address)
10.10.10.10 Associated (same as parent IP address
10.10.10.10)
10.10.11.11 Invalid (not equal to parent IP address)
11.11.11.254 Invalid (not equal to parent IP address)
11.11.11.255 Invalid (not equal to parent IP address)
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