19 messages in net.nether.puck.cisco-nsp[c-nsp] cisco 3750 arp timeout
FromSent OnAttachments
Matt BazanJan 13, 2005 3:22 pm 
Rodney DunnJan 13, 2005 3:36 pm 
Matt BazanJan 13, 2005 3:46 pm 
Rodney DunnJan 13, 2005 3:52 pm 
Church, ChuckJan 13, 2005 4:19 pm 
Matt BazanJan 13, 2005 4:51 pm 
Robert CroweJan 13, 2005 5:13 pm 
Matt BazanJan 13, 2005 5:21 pm 
Matt BazanJan 13, 2005 8:42 pm 
Church, ChuckJan 13, 2005 8:43 pm 
Rodney DunnJan 14, 2005 8:24 am 
Hudson Delbert J Contr 61 CS/SCBNJan 14, 2005 11:30 am 
Saku YttiJan 14, 2005 1:47 pm 
RavengateJul 6, 2005 1:55 pm 
Brett LooneyJul 6, 2005 7:34 pm 
Tantsura, JeffJul 7, 2005 5:58 am 
RavengateJul 7, 2005 1:56 pm 
RavengateJul 7, 2005 2:05 pm 
Tantsura, JeffJul 8, 2005 3:44 am 
Actions with this message:
Paste this link in email or IM:
Paste this link in email or IM:
Atom feed for this thread
Paste this URL into your reader:
Subject:[c-nsp] cisco 3750 arp timeoutActions...
From:Rodney Dunn (rod@cisco.com)
Date:Jan 13, 2005 3:52:23 pm
List:net.nether.puck.cisco-nsp

Yeah. From what I remember you would send the arp request then you send one last chance to get it.

200_#clear arp 200_# 3d00h: %SYS-5-CONFIG_I: Configured from console by console *Jan 13 20:48:22.978: IP ARP: sent req src 1.1.1.1 aabb.cc00.c800, dst 1.1.1.2 aabb.cc00.c900 Ethernet0/0 *Jan 13 20:48:22.998: IP ARP: rcvd rep src 1.1.1.2 aabb.cc00.c900, dst 1.1.1.1 E thernet0/0 *Jan 13 20:48:22.998: IP ARP: creating entry for IP address: 1.1.1.2, hw: aabb.c c00.c900

1 minute later I send a refresh attempt:

200_# *Jan 13 20:49:24.082: IP ARP: sent req src 1.1.1.1 aabb.cc00.c800, dst 1.1.1.2 aabb.cc00.c900 Ethernet0/0

Didn't get a response because I shut 1.1.1.2 down.

and then 60 seconds later it sends one last effort to get it and no response it's removed:

200_# *Jan 13 20:49:24.082: IP ARP: sent req src 1.1.1.1 aabb.cc00.c800, dst 1.1.1.2 aabb.cc00.c900 Ethernet0/0 200_# *Jan 13 20:50:24.082: IP ARP: sent req src 1.1.1.1 aabb.cc00.c800, dst 1.1.1.2 aabb.cc00.c900 Ethernet0/0 200_#sh arp Protocol Address Age (min) Hardware Addr Type Interface Internet 1.1.1.1 - aabb.cc00.c800 ARPA Ethernet0/0

I don't know when but in future code it will all be made event driven so the 60 second timer dependency will be removed.

Rodney

On Thu, Jan 13, 2005 at 12:46:42PM -0800, Matt Bazan wrote:

I set the timeout to be 60 but I still see them aging past 1 minute..ideas?

-----Original Message----- From: Rodney Dunn [mailto:rod@cisco.com] Sent: Thursday, January 13, 2005 12:37 PM To: Matt Bazan Cc: cisc@puck.nether.net Subject: Re: [c-nsp] cisco 3750 arp timeout

I'm pretty sure this has not changed recently. There is a background process that ages the arp entries and it runs every 60 seconds so 60 should be a minimum setting. Actually the minimum I would ever recommend is 120 seconds due to the CEF adjacency entries.

Rodney

On Thu, Jan 13, 2005 at 12:22:47PM -0800, Matt Bazan wrote:

I've got a number of interfaces on one of my 3750's (IOS 12.1(11)AX SMI) that I've set the arp timeout to be one second. However, the entries in the arp cache continue to show up until the default arp timeout has been reached. It was my understanding that setting the arp timeout per interface to 1 would clear these entries after 1 second. Am I misunderstanding how this command works? If so, is there a command to remove entries from the arp cache after 1 second? Thanks,

Matt

_______________________________________________ cisco-nsp mailing list cisc@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/