[c-nsp] Arp Input Process Causing Spike in CPU

[Christian Koch]

Rodney,

This is a 6509 running  c6sup2_rp Software (c6sup2_rp-PSV-M), Version
12.1(11b)E12,


-Christian 

|-----Original Message-----
|From: Rodney Dunn [mailto:rodunn at cisco.com] 
|Sent: Thursday, March 15, 2007 11:22 AM
|To: Christian Koch
|Cc: Gert Doering; cisco-nsp at puck.nether.net
|Subject: Re: [c-nsp] Arp Input Process Causing Spike in CPU
|
|What type of box? 75xx?
|
|What code?
|
|
|We have done a new scalability rewrite of the ARP code to get 
|thousands of entries. I need to check where that is going in.
|
|Rodney
|
|
|
|On Thu, Mar 15, 2007 at 10:40:22AM -0400, Christian Koch wrote:
|> This is an NSP network.. All the arp entries are customers
|> 
|> Also log errors
|> 
|> Mar 15 07:38:35: %SYS-3-CPUHOG: Task ran for 6072 msec (72/20), 
|> process = ARP Input, PC = 4025C948.
|> -Traceback= 4025C950 403CA9A0 4024340C 402433F8 Mar 15 07:39:13: 
|> %FIB-2-FIBDOWN: CEF has been disabled due to a low memory condition.
|>  It can be re-enabled by configuring "ip cef [distributed]"
|> edge1-gw1.SJC1#
|> 
|> 
|> 
|> -Christian
|> 
|> |-----Original Message-----
|> |From: Gert Doering [mailto:gert at greenie.muc.de]
|> |Sent: Thursday, March 15, 2007 10:38 AM
|> |To: Christian Koch
|> |Cc: cisco-nsp at puck.nether.net
|> |Subject: Re: [c-nsp] Arp Input Process Causing Spike in CPU
|> |
|> |Hi,
|> |
|> |On Thu, Mar 15, 2007 at 09:44:23AM -0400, Christian Koch wrote:
|> |> I'm seeing cpu spikes due to  the arp input process 
|running high ..
|> |> 
|> |> Currently every route is pointed to next hop and the arp table 
|> |> looks like..
|> |> 
|> |> #sh ip arp sum
|> |> 1743 IP ARP entries, with 21 of them incomplete
|> |
|> |1743 ARP entries?
|> |
|> |Over *thousand seven hundred* entries?  What sort of networks have 
|> |you connected to this router...?
|> |
|> |> Can anyone suggest how to reduce this for a short term fix... I 
|> |> know the long term is to upgrade the mem
|> |
|> |Memory doesn't play a role in this.  Topology does, 
|reasonably-sized 
|> |subnets, CoPP rate-limiting ARP storms, etc.
|> |
|> |gert
|> |--
|> |USENET is *not* the non-clickable part of WWW!
|> |                                                           
|> |//www.muc.de/~gert/
|> |Gert Doering - Munich, Germany                             
|> |gert at greenie.muc.de
|> |fax: +49-89-35655025                        
|> |gert at net.informatik.tu-muenchen.de
|> |
|> |
|> 
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