Configuring Shared Ip Interfaces - Juniper IGP - CONFIGURATION GUIDE V11.1.X Configuration Manual

IP interfaces; however, in this scenario, data received on the layer 2 interface is
discarded.
You cannot create shared IP interfaces for the following kinds of interface:
For information about configuring shared IP interfaces to receive data on the same
layer 2 interface as a primary IP interface, see JUNOSe Broadband Access Configuration
Guide.

Configuring Shared IP Interfaces

To share IP interfaces:
1.
2.
3.
4.
5.
interface ip
IP floating interfaces (IP interfaces that stack over MPLS stacked tunnels)
Loopback interfaces
Null interfaces
Create a layer 2 interface.
host1(config)#interface atm 5/3
host1(config-if)#interface atm 5/3.101
(Optional) Create a primary IP interface.
host1(config-if)#ip address 10.1.1.1 255.255.255.255
host1(config-if)#exit
Create the shared IP interface.
host1(config)#interface ip si0
Associate the shared IP interface with the layer 2 interface by one of the following
methods:
Statically
host1(config-if)#ip share-interface atm 5/3.101
Dynamically
host1:vr-a:vrf-1(config-if)#ip share-nexthop 10.0.0.1
To fully configure the shared interface, assign an address (or make the interface
unnumbered).
host1(config-if)#ip address 2.2.2.2 255.0.0.0
Use to create an IP interface for interface sharing.
Use the specified name to refer to the shared IP interface; you cannot use the
layer 2 interface to refer to them, because the shared interface can be moved.
Example
Chapter 1: Configuring IP
57
Shared IP Interfaces