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show arp

Syntax

show arp
<no-resolve>
<expiration-time>

Release Information

Command introduced before JUNOS Release 7.4.

expiration-time option added in JUNOS Release 8.1.

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.

Options

none — Display the entries in the ARP table.

no-resolve — (Optional) Do not attempt to determine the hostname that corresponds to the IP address.

expiration-time — (Optional) Display the amount of time, in seconds, until each ARP entry is set to expire.

Required Privilege Level

view

Related Topics

clear arp

set cli logical-system

List of Sample Output

show arp
show arp no-resolve
show arp expiration-time

Output Fields

Table 111 describes the output fields for the show arp command. Output fields are listed in the approximate order in which they appear.

Table 111: show arp Output Fields

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

( no-resolve option only) Indicates how mappings between IP and MAC addresses are defined:

  • Permanent—Static mapping.
  • Permanent and published—Static mapping that is published.
  • None—Dynamic mapping.

TTE

(expiration-time option only) Amount of time, in seconds, until ARP entry is set to expire.

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 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
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