show arp
Syntax
show arp <expiration-time> <hostname host-name> <interface interface-name> <logical-system logical-system-name> <no-resolve> <reference-count count> <tenant name> <state state> <vpn vpn-name>
Description
Display all entries in the Address Resolution Protocol (ARP) table. To display entries for
a particular logical system only, first enter the set cli logical-system
logical-system-name command, and then enter the show
arp command.
Starting with Junos OS Release 14.2, the following enhancements have been made to the
output of the show arp interfaces command:
-
For integrated routing and bridging (IRB) interfaces, in the output of the
show arpcommand, the IRB interface name is displayed under the Interface field of the output and the Layer 2 interface identifier is specified in square brackets following the IRB name. Until Release 14.1 and earlier, only the layer 2 interface name and not the IRB name was displayed. -
Starting with release 14.2, if you do not specify a subinterface or a logical unit of the interface with the
show arp interface interface-namecommand, an error message is shown. Until Release 14.1 and earlier, if you did not specify the subinterface for a physical interface, the system considered the supplied command to be for subinterface 0 and displayed the output. For example, if you entered ge-2/2/5, it was processed by the system as ge-2/2/5.0. -
When IRB interfaces are configured and if you attempt to specify an interface name that is not configured on the system, an error message is displayed stating the particular interface is not defined on the system. Until release 14.1 and earlier, unrelated and incorrect entries were displayed even for interface names that did not exist.
-
Starting with Release 14.2, you can enter the
show arp interfacecommand with the IRB name and retrieve the statistical details for the IRB interface. This functionality was not available previously. However, you could previously obtain the ARP details of an IRB interface that had a Layer 2 interface configured.
Starting with Junos OS Release 16.1, show arp no-resolve command does
not display the underlying ifl information if enhanced-convergence
statement at [edit irb unit unit-number hierarchy
level and enhanced-ip statement at [edit chassis network-services]
hierarchy level is configured for the destination interface IRB.
Options
| none |
Display the entries in the ARP table. |
| expiration-time |
(Optional) Display the amount of time, in seconds, until each ARP entry is set to expire. |
| hostname host-name |
(Optional) Display the hostname. |
| interface interface-name |
(Optional) Display information about ARP for the specified logical interface |
| logical-system logical-system-name |
(Optional) Display ARP entries for the specified logical system; only available on the main router context. |
| no-resolve |
(Optional) Do not attempt to determine the hostname that corresponds to the IP address. |
| reference-count count |
(Optional) Display the next-hop reference count. |
| state state |
(Optional) Display the next-hop current state. |
| tenant name |
(Optional) Display the ARP entries for the specified tenant. Only available in the main router context. |
| vpn vpn-name |
(Optional) Display entries in the ARP table for the specified virtual private network’s (VPN) routing table. Note:
|
Required Privilege Level
view
Output Fields
Table 1 describes the output fields for the
show arp command. Output fields are listed in the approximate order in which
they appear.
|
Field Name |
Field Description |
|---|---|
|
MAC Address |
Media access control (MAC) address that corresponds to the IP address. |
|
Address |
IP address that corresponds to the hostname. |
|
Name |
Hostname. |
|
Interface |
Interface name. |
|
Flags |
|
|
TTE |
( |
Sample Output
show arp
user@host> show arp MAC Address Address Name Interface 00:e0:81:22:fd:74 192.168.64.10 firewall.my.net fxp0.0 00:04:5a:65:78:e1 192.168.65.13 lab.my net fxp0.0
show arp no-resolve
user@host> show arp no-resolve MAC Address Address Interface Flags 00:90:69:96:00:01 10.10.45.5 fe-0/0/1.0 none 00:00:00:00:00:01 200.200.200.1 fe-0/0/0.0 permanent published 00:00:00:00:00:02 200.200.200.2 fe-0/0/0.0 permanent 00:90:69:91:b0:00 200.200.200.3 fe-0/0/0.0 none Total entries: 4
show arp no-resolve
user@host> show arp no-resolve (QFX Series)
The command is displaying the MAC and MAC-IP routes are programmed over the .local interface.
MAC Address Address Interface Flags 00:00:10:00:11:00 10.0.1.1 irb.100 [.local..5] permanent remote 00:00:10:00:22:00 10.0.1.2 irb.100 [.local..5] permanent remote 00:00:10:00:33:00 10.0.1.3 irb.100 [.local..5] permanent remote 00:00:10:00:44:00 10.0.1.4 irb.100 [.local..5] permanent remote 00:00:10:11:22:00 10.0.1.12 irb.100 [.local..5] permanent remote 00:00:10:11:33:00 10.0.1.13 irb.100 [.local..5] permanent remote 00:00:10:11:44:00 10.0.1.14 irb.100 [.local..5] permanent remote 00:00:10:11:66:00 10.0.1.16 irb.100 [.local..5] permanent remote 40:00:10:11:11:00 10.0.1.254 irb.100 permanent published gateway 00:00:10:00:11:01 10.0.2.1 irb.200 [.local..5] permanent remote 00:00:10:00:22:01 10.0.2.2 irb.200 [.local..5] permanent remote 00:00:10:00:33:01 10.0.2.3 irb.200 [.local..5] permanent remote 00:00:10:00:44:01 10.0.2.4 irb.200 [.local..5] permanent remote 00:00:10:11:22:01 10.0.2.12 irb.200 [.local..5] permanent remote 00:00:10:11:33:01 10.0.2.13 irb.200 [.local..5] permanent remote 00:00:10:11:44:01 10.0.2.14 irb.200 [.local..5] permanent remote 00:00:10:11:66:01 10.0.2.16 irb.200 [.local..5] permanent remote Total entries: 26
command-name
user@host> show arp no-resolve
The command displaying the underlying l2 ifl information when
enhanced-convergence statement and enhanced-ip
statement is not configured.
show arp no-resolve MAC Address Address Interface Flags 02:01:00:00:00:05 10.0.0.5 em1.0 none 00:00:5e:00:01:1b 91.91.91.50 irb.0[xe-2/1/0.0] none >>> underlying l2 ifl associated 02:01:00:00:00:05 128.0.0.5 em1.0 none 02:01:00:00:00:05 128.0.0.6 em1.0 none 02:00:00:00:00:12 128.0.0.18 em0.0 none 00:26:88:6a:c6:80 192.168.237.126 fxp0.0 none Total entries: 6
The command not displaying the underlying l2 ifl information when
enhanced-convergence statement and enhanced-ip
statement is configured.
MAC Address Address Interface Flags 02:01:00:00:00:05 10.0.0.5 em1.0 none 00:00:5e:00:01:1b 91.91.91.50 irb.0 none >>> underlying l2 ifl association is removed. 02:01:00:00:00:05 128.0.0.5 em1.0 none 02:01:00:00:00:05 128.0.0.6 em1.0 none 02:00:00:00:00:12 128.0.0.18 em0.0 none 00:26:88:6a:c6:80 192.168.237.126 fxp0.0 none Total entries: 6
show arp expiration-time
user@host> show arp expiration-time MAC Address Address Name Interface Flags TTE 00:a0:a5:12:3e:d4 10.0.0.5 10.0.0.5 fxp1.0 none 00:e0:81:22:fd:74 192.168.64.10 supernova.englab.juniper. fxp0.0 none 1491 00:30:48:84:03:56 192.168.65.46 kgb.englab.juniper.net fxp0.0 none 1279 00:03:ba:12:f7:5e 192.168.65.226 nmssun1-eri0.englab.junip fxp0.0 none 452 00:90:69:8e:b0:fc 192.168.71.254 stonewall-ge-200.englab.j fxp0.0 none 1421 Total entries: 5
Release Information
Command introduced before Junos OS Release 7.4.
expiration-time option added in Junos OS Release 8.1.
logical-system and vpn options added in Junos OS Release
10.1.
reference-count, tenant, and state
options added in Junos OS Release 18.3.