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Invalid packet (too large) length=34176

There are many log messages on our three 7609 routers .

Aug 16 06:17:22.664 beijing: Invalid packet (too large) length=34176

Aug 16 06:29:13.102 beijing: Invalid packet (too large) length=34176

Aug 16 06:45:23.403 beijing: Invalid packet (too large) length=34176

Aug 16 16:46:17.245 beijing: Invalid packet (too large) length=34176

Aug 16 16:46:26.257 beijing: Invalid packet (too large) length=34176

Aug 16 17:15:30.621 beijing: Invalid packet (too large) length=34176

Aug 16 17:54:51.775 beijing: Invalid packet (too large) length=34176

Aug 16 18:23:22.131 beijing: Invalid packet (too large) length=34176

Aug 16 18:54:45.760 beijing: Invalid packet (too large) length=34176

Aug 16 20:04:08.046 beijing: Invalid packet (too large) length=34176

Aug 16 20:50:07.852 beijing: Invalid packet (too large) length=34176

Aug 16 21:28:22.549 beijing: Invalid packet (too large) length=34176

Please help me ! Why  did   the log  appeared ?

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Invalid packet (too large) length=34176

Maybe some naive attack from outside.

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