Thursday, October 2, 2008

CEF Troubleshooting With Ping

Few days back I faced problem related to the CEF. I tried to ping from one router to another but found packet drops. SO I initiated the first step with ping. By using extended ping I set the record option and find ping reply.
So what is the difference when we use the ping with record option and without record option. Actually by setting record option ping packets uses the fast switching and without record option it uses the cef switching. So I conclude there might be problem with the CEF in the path.

Protocol [ip]:
Target IP address:
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: FastEthernet0/0.50
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]: Record
Number of hops [ 9 ]:
Loose, Strict, Record, Timestamp, Verbose[RV]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
Packet sent with a source address of
Packet has IP options: Total option bytes= 39, padded length=40
Record route: <*>

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