Today I've noticed some strange error on my Cisco 1841 router :
%FIB-4-FIBCBLK: Missing cef table for tableid 65535 during CEF samecable event
After searching the net, i've found some Cisco bug that describes this.
"FIB-4-FIBCBLK errors with dns view Symptoms Message "%FIB-4-FIBCBLK: Missing cef table for tableid 65535 during CEF samecable event" displayed on the console logs. Conditions The message seems to be generated anytime a dns request is made to the router where the router then has to use the dns forwarder Workaround No workaround"
This happens when you have DNS server on the device and it needs to grab the answer from the device configured DNS server (A.K.A DNS Forwarder), and each request will cause this error log.
According to Cisco, the affected device list does not include my MD release - 12.4(25b), however i do see it (bugId=CSCsx53968)
List of IOS with the Fix :
12.2(33)XNE 12.4(24.6)T1 12.4(15)T9 12.2(32.8.11)SR183 12.2(32.8.1)REC186 12.4(20)T3 12.2(33.1.3)MCP5 15.0(1)M 12.4(24)T1 12.2(32.8.1)REE186 12.4(22)T2 12.4(22)MDA1 12.4(24)YG 12.4(24)GC1 12.4(22)XR 12.4(24)MD 12.4(22)YE2
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