Cisco phone dropping icmp packets from IOS switch

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Jan 27th, 2010
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I have various customers running Cisco 7940's, 7911, 7942 and 7962 phones.  If I send an extended ping to the phone for more than 5 packets at a time, they start to drop.  There is no problems being reported with phone quality or phones dropping, its just something I noticed when running some ping tests to various phones checking for any network issues.  Is this normal?


I'm looking for Cisco documented reason for this.  Thanks!

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jbankstonga Wed, 01/27/2010 - 17:29
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I had this problem quite some time ago, and TAC explained that this is by design. The intended effect is to prevent a DOS/DDOS attack by intentionally not processing all icmp packets.


-Jeff

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