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Proxy arp

jegan_rajappa
Level 1
Level 1

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.

1 Accepted Solution

Accepted Solutions

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.

View solution in original post

6 Replies 6

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  

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 

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.

Thank you @MHM Cisco World 

Joseph W. Doherty
Hall of Fame
Hall of Fame

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
VIP
VIP

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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