Operational Behavior Of Interfaces When The Same Ipv4 Address Is Assigned To Them - Juniper EX2200 Hardware Manual

Network Interfaces for EX4300 Switches
50
Operational Behavior of Interfaces when the Same IPv4 Address is Assigned to
Them
You can configure the same IPv4 address on multiple physical interfaces. When you
assign the same IPv4 address to multiple physical interfaces, the operational behavior
of those interfaces differs, depending on whether they are implicitly or explicitly
point-to-point .
NOTE: By default, all interfaces are assumed to be point-to-point (PPP)
interfaces. For all interfaces except aggregated Ethernet, Fast Ethernet, and
Gigabit Ethernet, you can explicitly configure an interface to be a
point-to-point connection.
The following examples show the sample configuration of assigning the same IPv4
address to implicitly and explicilty point-to-point interfaces, and their corresponding
command outputs to see their operational status.
show interfaces terse
Configuring same IPv4 address on implicitly PPP interfaces:
[edit]
user@host# show
ge-0/1/0 {
unit 0 {
family inet {
address 200.1.1.1/24;
}
}
}
ge-3/0/1 {
unit 0 {
family inet {
address 200.1.1.1/24;
}
}
}
The sample output shown below for the above configuration reveals that only
ge-0/1/0.0 was assigned the same IPv4 address
while was not assigned the IPv4 address, though its
ge-3/0/1.0
which means that it will be operational only when it gets a unique IPv4 address other
than 200.1.1.1/24 .
user@host> show interfaces terse ge*
Interface
ge-0/1/0
ge-0/1/0.0
ge-0/1/1
ge-3/0/0
ge-3/0/1
ge-3/0/1.0
200.1.1.1/24
Admin Link Proto Local
up up
up up inet
multiservice
up down
up down
up up
up up inet
multiservice
Copyright © 2015, Juniper Networks, Inc.
and its link state was up
state was up,
link
Remote
200.1.1.1/24
,