IOS Ping using TOS Bit

From NippAero

I was turned on to this by Robert. It is very useful for validating Qos policy maps in IOS. You can use the extended ping to produce a packet with the necessary TOS bit to match your Qos policy.

Using either Hex (0xb8) or Dec (184) works fine.

This example will ping using DSCP value EF.

Router#ping
Protocol [ip]:
Target IP address: 192.168.0.1
Repeat count [5]: 100
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 192.168.2.100
Type of service [0]: 0xb8
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 192.168.0.1, timeout is 2 seconds:
Packet sent with a source address of 192.168.2.100
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 24/25/28 ms
Router#