Alcatel-Lucent 7450 Configuration Manual page 188

Router Interface Commands
Description
This command creates a loopback interface for use in multihoming resiliency. Once active, this
interface can be used to advertise reachability information to the rest of the network using the
primary address, which is backed up by the secondary.
The reachability for this address is advertised via IGPs and LDP protocols to allow the resolution of
BGP routes advertised with this address.
The no form of the command disables this setting.
Default no multihoming
address
Syntax address {ip-address/mask | ip-address netmask}
no address
Context config>router>mh-primary-interface
config>router>mh-secondary-interface
Description This command assigns an IP address, IP subnet and broadcast address format to an IP interface. Only
one IP address can be associated with an IP interface. An IP address must be assigned to each IP
interface for the interface to be active. An IP address and a mask combine to create a local IP prefix.
The defined IP prefix must be unique within the context of the routing instance. It cannot overlap
with other existing IP prefixes defined as local subnets on other IP interface in the same routing
context within the router.
The local subnet that the address command defines must not be part of the services address space
within the routing context by use of the config>router>service-prefix command. Once a portion of
the address space is allocated as a service prefix, that portion is not available to IP interfaces for
network core connectivity. The IP address for the interface can be entered in either CIDR (Classless
Inter-Domain Routing) or traditional dotted decimal notation. Show commands display CIDR
notation and are stored in configuration files.
By default, no IP address or subnet association exists on an IP interface until it is explicitly created.
The no form of the command removes the IP address assignment from the IP interface. Interface
specific configurations for IGP protocols like OSPF are also removed. The no form of this command
can only be performed when the IP interface is administratively shut down. Shutting down the IP
interface will operationally stop any protocol interfaces or MPLS LSPs that explicitly reference that
IP address. When a new IP address is defined, the IP interface can be administratively enabled (no
shutdown), which reinitializes the protocol interfaces and MPLS LSPs associated with that IP
interface.
If a new address is entered while another address is still active, the new address wil be rejected.
Parameters ip-address — The IP address of the IP interface. The ip-addr portion of the address command
specifies the IP host address that will be used by the IP interface within the subnet. This address must
be unique within the subnet and specified in dotted decimal notation.
/ — The forward slash is a parameter delimiter that separates the ipp-addr portion of the IP address
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Values 1.0.0.0 - 223.255.255.255
from the mask that defines the scope of the local subnet. No spaces are allowed between the ip-
7450 ESS Router Configuration Guide