Show arp output on cisco switch

[sarahr202]

Hi every body.

I just want to know about the output of"  show output"  on cisco ios switch.  Numerous google searches returned  " show ip arp"   , i could not find one for " show arp" .

Thanks  and have a great Chrismas.

[Mahesh Gohil · Accepted solution]

Hello Sara,

It displays the hardware address learned from remote and local w.r.t ip address configured at local end

Like I have configured one interface vlan with subnet 172.16.23.234/24 and I have connected one more router with IP address:172.16.23.102

so the typical output is

lab01>sh arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet 172.16.23.234           -   0023.058c.5c40  ARPA   Vlan1
Internet  172.16.23.102           0   0800.20ad.b33a  ARPA   Vlan1

It is same as sh ip arp .

The main difference is sh ip arp is showing only ip (internet) as a protocol while sh arp includes many options like (appletalk, internet)

Below is the link which talks about different fiedls in output

http://www.cisco.com/en/US/docs/ios/ipaddr/configuration/guide/iad_cfg_arp_ps6350_TSD_Products_Configuration_Guide_Chapter.html

Regards

Mahesh

[Reza Sharifi · Accepted solution]

Hi Sara,

here are the outputs for both commands:

C3750-E#sh arp   
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  192.168.1.10            -   001b.5400.33c0  ARPA   Vlan1
Internet  192.168.1.4             2   0024.2bb6.fd30  ARPA   Vlan1
C3750-E#sh ip arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  192.168.1.10            -   001b.5400.33c0  ARPA   Vlan1
Internet  192.168.1.4             2   0024.2bb6.fd30  ARPA   Vlan1
C3750-E#

I don't see a difference

HTH

Reza

[Mahesh Gohil · Accepted solution]

Hello Reza,

Since you are using only ip as a protocol on interface that is the reason it is showing no difference to you in both output.

If you enable appletalk or IPX then the output of sh arp will be different.

You will be able to see Appletalk in output of protocol field of sh arp

Please correct me if I am missing something

Regards

mahesh