Alcatel-Lucent 7450 Configuration Manual page 386

Interface Configuration Commands
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.
The same virtual router IP address may not be assigned to two separate virtual router instances. If the
virtual router IP address already exists on another virtual router instance, the virtual router IP address
assignment will fail.
Example - Non-Owner Virtual Router Instance
Virtual Router IP Address Assignment without Parent IP Address — When assigning an
IP address to a virtual router instance, an associated IP address (see Owner Virtual Router IP
Address Parental Association and Non-Owner Virtual Router IP Address Parental Association)
on the parental IP interface must already exist. If an associated IP address on the parental IP interface
is not configured, the virtual router IP address assignment fails.
Parent Primary IP Address Changed — When a virtual router IP address is set and the
associated parent IP interface IP address is changed, the new parent IP interface IP address is
evaluated to ensure it meets the association rules defined in Owner Virtual Router IP Address
Parental Association or Non-Owner Virtual Router IP Address Parental Association. If the
association check fails, the parental IP address change is not allowed. If the parental IP address
change fails, the previously configured IP address definition remains in effect.
Only the primary parent IP address can be changed. Secondary addresses must be removed before the
new IP address can be added. Parent Primary or Secondary IP Address Removal explains IP
address removal conditions.
Parent Primary or Secondary IP Address Removal — When a virtual router IP address is
successfully set, but removing the associated parent IP interface IP address is attempted and fails. All
virtual router IP addresses associated with the parental IP interface IP address must be deleted prior
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Parent IP addresses:
Virtual router IP addresses:
11.11.11.254 Invalid (not equal to parent IP address)
11.11.11.255 Invalid (not equal to parent IP address)
10.10.10.10/24
11.11.11.11/24
10.10.10.11 Associated with 10.10.10.10 (in subnet)
10.10.10.10 Invalid (same as parent IP address)
10.10.11.11 Invalid (outside of all Parent IP subnets)
11.11.11.254 Associated with 11.11.11.11 (in subnet)
11.11.11.255 Invalid (broadcast address of 11.11.11.11/
24)
7450 ESS Router Configuration Guide