Ethernet Switching
Ethernet Switching

Finding incomplete ARP entries

02.07.17   |  
‎02-07-2017 05:24 PM

Hi,

 

"show arp" doesn't seem to list "incomplete" ARP entries - that is, actually saying that it couldn't find the MAC address for a given IP. This is contrary to the normal "arp" command in Linux and other environments.

 

Is there a different command to list ARP failures?

4 REPLIES
Ethernet Switching

Re: Finding incomplete ARP entries

02.11.17   |  
‎02-11-2017 05:36 AM

The underlying OS for Junos is BSD if that helps and you can exist the the shell to see what is visible there.

 

In Junos your other path for mac information is the ethernet switching commands

 

show ethernet-switching statistics mac-learning

show ethernet-switching mac-learning-log

Steve Puluka BSEET
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Senior IP Engineer - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
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Ethernet Switching

Re: Finding incomplete ARP entries

02.15.17   |  
‎02-15-2017 07:03 AM

@ Pululka

Hi NO, going to shell does not help in this case

the CLI "show arp " and the shell command "arp -a" both show exactly the same information in the same format and both are NOT displaying incomplete arp entries.

(I tested  and verified it on QFX and MX)

 

regards

 

alexander

Ethernet Switching

Re: Finding incomplete ARP entries

02.15.17   |  
‎02-15-2017 08:07 AM

Does arp -v help?  I asume you are looking for host entries whose MAC is 00-00-00-00-00-00, unknown for associated IP, yes?

Ethernet Switching

Re: Finding incomplete ARP entries

02.15.17   |  
‎02-15-2017 12:10 PM

arp -v gives version info:

% arp -v

$Id: arp.c 652546 2014-06-04 09:33:16Z abollineni $