01-31-2007 07:22 AM - edited 07-03-2021 01:33 PM
Hi there,
Does anyone know, why the CP7920 send aprox. every 60 sec. an ARP Req. Packet
Src: MAC Cisco 7920
Dst: ff:ff:ff:ff:ff:ff
-------------------------------------------------------
ARP:
Sender MAC: MAC Cisco 7920
Sender IP: 0.0.0.0
Target MAC: 00:00:00:00:00:00
Target IP: IP Cisco 7920
-------------------------------------------------------
The context of my question is that on the corresponding Switch which connects the Access Point
is "arp-inspection" and "dhcp-snooping" configured and we receive log msgs like the following
nearly every minute (same interval like the ARP Req. packets)
%SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Fa1/0/1, vlan 21.([0014.f2c8.67c0/0.0.0.0/0000.0000.0000/10.98.60.140/13:53:55 MET Fri Jan 26 2007])
Is there a way to get rid of the log msgs and change the arp behavior respectively ?
! Thanks in advance !
Emanuel
01-31-2007 10:44 AM
The 7920 will send ARP for its own IP address every 60 seconds for duplicate IP detection.
02-01-2007 07:13 AM
I thought so.
But do you know how to prevent the log messages ?
02-02-2007 11:48 AM
Sounds like a bug. Can open a TAC case. Other workaround is to disable DHCP snooping, but probably not a good alternative just to disable a message.
02-02-2007 12:12 PM
right, it's no good workaround ;)
sure this is a bug? 'cause this MAC ((source)7920mac) and IP ((source) 0.0.0.0)) is not in the binding table so therefor the switch has to generate the msg., doesn't it ? (just thinking)
BTW: best regards from Thomas Sillaber (if you still remember him ;)
I'll try to filter these msgs somehow. have to talk to customer about the possibility. I would apreciate a shot notice, if this really is a bug or not. cheers
02-05-2007 05:44 PM
Just guessing, disabling "arp inspection" might be helpful.
02-07-2007 03:58 AM
Of course, this would solve the issue,... BUT I need this feature to be keept turned on. You wouldn't for instance disable ip routing, just 'cause you get a log msgs, would you ?
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: