msg on 6513 Switch arp: ether address is broadcast for ip...

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Sep 25th, 2007
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I have an urgent issue. We notice that we can't ping our company's core switch Catalyst 6513 and i logged in and saw high broadcast traffic from PCs on a subnet configured as a secondary ip address on the default head office vlan. I remove the secondary subnet ip and the high broadcast traffic reduce. But i now get a log on the console that says: arp: ether address is broadcast for IP address a000468! I dont understand this message. Please help urgently. Thnks.

Correct Answer by nambi_gct about 9 years 8 months ago

Hi,please check arp manual to understand this error.


arp: ether address is broadcast for IP address %d.%d.%d.%d!: ARP requested information for a host, and received an answer indicating that the host's ethernet address is the ethernet broadcast address. This indicates a misconfigured or broken device.


http://www.gsp.com/cgi-bin/man.cgi?section=4&topic=arp


Hope this clarifies.

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nambi_gct Tue, 09/25/2007 - 02:48
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Hi, can you please check the arp entry for 10.0.64.104 in your 6k.Also please check if you have a mac entry in the cam table.this may give a clue.

imuonagor Tue, 09/25/2007 - 03:25
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Thanks Nambi... the log message has stopped after a while and without me doing anything. I still checked the arp table. But I didn't see any entry for 10.0.64.104. Actually we don't have 10.0.64.0 subnet on our network. Is that what the a000468! works out to? Please how did you work out the ip address 10.0.64.104? Thanks a million.

nambi_gct Tue, 09/25/2007 - 04:22
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Hi,if you convert a000468 to decimal you will get the IP address 10.0.64.104.

Correct Answer
nambi_gct Tue, 09/25/2007 - 05:01
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Hi,please check arp manual to understand this error.


arp: ether address is broadcast for IP address %d.%d.%d.%d!: ARP requested information for a host, and received an answer indicating that the host's ethernet address is the ethernet broadcast address. This indicates a misconfigured or broken device.


http://www.gsp.com/cgi-bin/man.cgi?section=4&topic=arp


Hope this clarifies.

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