Proxy arp

[jegan_rajappa]

Hi, Is there any way to identify whether endpoints are using proxy arp (default feature enabled) in Cisco catalyst switch to establish connectivity with another endpoints from Cisco catalyst switch perspective with any show commands? Disabling proxy arp creates disruption, it is also not easy to verify gateway and subnet mask in various endpoints, I know debug arp is one one option , I want to check whether there is any other options, please advise.

[MHM Cisco World]

Router# show arp traffic 

ARP statistics:
  Recv: 2691 requests, 91 replies
  Sent: 67 requests, 2 replies (0 proxy, 1 gratuitous)
  Resolve requests rcvd: 1
  Resolve requests dropped: 0
  Errors: 0 out of memory, 0 no buffers

ARP cache:
  Total ARP entries in cache: 5
  Dynamic: 3, Interface: 1, Standby: 0
  Alias: 0,   Static: 0, DHCP:0, DropAdj: 1

  IP Packet drop count for node 0/0/CPU0: 1

this for Router but I think SW also support this command  

[jegan_rajappa]

Show arp traffic command works only in IOS-XR devices only, not in IOS or IOS-XE devices (Switches), I am trying to understand if switches  has any options 

[MHM Cisco World · Accepted solution]

Yes I check after answer you, 
I check all command 

I found one 
show ip traffic 

ARP statistics:
  Rcvd: 1477 requests, 8841 replies, 396 reverse, 0 other
  Sent: 1 requests, 20 replies (0 proxy), 0 reverse
  Drop due to input queue full: 0

 may be this can help you.

[jegan_rajappa]

Thank you @MHM Cisco World 

[Joseph W. Doherty]

Firstly, unless the Catalyst is L3, it wouldn't "care" about ARP (beyond, possibly, populating its own ARP table as a network host).

Beside using debug ARP, as you mention, if the Cisco device supports embedded packet capture, you might use that to capture ARPs, network hosts ARPing for IPs not on the local network.  (Unsure whether embedded packet capture could "pre-filter" packets to those "of interest".)

Also on the packet capture front, if a Cisco device doesn't support what you want with embedded packet capture, possible you can span traffic to another host running a packet capture utility.

[Martin L]

is proxy arp enabled (default or not)  on your switch? not sure why and check. What switch model /IOS ? Proxy Arp is enabled on routers for sure.

Regards, ML
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