Detailed description of Cisco router user execution and privileged mode configuration

There are many things worth learning about the configuration mode of a Cisco router. Here we mainly introduce the mode of user execution and privilege of a Cisco router. Ping is the most commonly used troubleshooting command. It consists of a group of ICMP response request packets. If the network runs normally, a group of response packets will be returned. ICMP messages are transmitted using IP data packets. Therefore, when an ICMP response message is received, the connections below Layer 3 are working normally.

The ping Command of the Cisco router not only supports the IP protocol, but also supports most other desktop protocols, such as the ping command of IPX and AppleTalk protocols. First, let's take a look at the execution of ping commands supporting the IP protocol in user EXEC mode, and then discuss the many powerful functions of the extended ping command in privileged mode.

User Execution Mode

A simple ip ping operation can be performed in user mode or in privileged mode. Under normal circumstances, the command will send back five response requests. The five exclamation points indicate that all requests have successfully received the response. The output also contains the maximum, minimum, and average round-trip time information. Every "!" Indicates that an echo response is successfully accepted. If it is not "!" The reason why the echo response is not received:

! Response received
· Request timeout
U destination inaccessible
P protocol not reachable
N Network inaccessible
Q source Suppression
M cannot be segmented
? Unknown Message Type

The ipx ping ipx command can only be executed on Cisco Routers running IOS v 8.2 and later versions. In user mode, IPX ping is generally only used to test the Cisco router interface. In privileged mode, you can ping a specific NOVELL workstation. The command format is "ping ipx IPX address ". Appletale ping the command to use Apple Echo Protocol (AEP) to confirm the connectivity between AppleTalk nodes. Note that the current Cisco router only supports the Apple Echo Protocol for Ethernet interfaces. The command format is "ping apple Appletalk address ".

Privileged Execution Mode

In privileged mode, the extended ping command applies to any Desktop Protocol. It contains more functional attributes, so you can obtain more detailed information. Through this information, we can analyze the causes of network performance degradation, not just service loss. The execution method of the extended ping command is also ping. The Cisco router then prompts different attributes. The following describes how to PING An extended ip Address: Loose, Strict, Record, Timestamp, and Verbose [none. Generally, only the Record attribute and Verbose attribute are used. Other attributes are rarely used. Record can be used to Record the address of each hop of a message. The Verbose attribute specifies the response time of each response. Sweep range of sizes [n] This attribute is mainly used to test faults such as the loss of large packets, slow processing speed, or failed segmentation.

Extend ipx ping the extended IPX ping also allows you to modify parameters, such as the packet size and number of duplicates. Another enhancement attribute of ping in user mode is the NovellStandard echo attribute. With this attribute, You can ping the workstation that loads IPX. If this attribute is disabled, the Novell IPX devices do not respond to ping because they do not support the Cisco proprietary IPX ping protocol. You can modify the properties of devices to make them support this feature. Extended appletalk ping: the EXTENDED AppleTalk ping command is used to enhance the ping in user mode, which is similar to the extended ipx ping command. You can also select Verbose and other attributes like the IP address and IPX extended ping.