Cisco 7300-6T3 Especificações descarregar pdf (Página 50)

4-16

Cisco 7304 6-Port Clear Channel E3 Line Card Installation and Configuration

OL-5061-01

Chapter 4 Configuring the 6E3 Line Card

Checking the Configuration

Using loopback Commands

With the loopback test, you can detect and isolate equipment malfunctions by testing the connection

between the 6E3 line card interface and a remote device such as a modem or a CSU/DSU. The loopback

command places an interface in loopback mode, which enables test packets that are generated from the

ping command to loop through a remote device or compact serial cable. If the packets complete the loop,

the connection is good. If not, you can isolate a fault to the remote device or compact serial cable in the

path of the loopback test.

Table 4-8 provides examples of the loopback {dte | local | network {line | payload} command. The

examples given are for interface 0 of a 6E3 line card in slot 2 of a Cisco 7304 router:

Figure 4-1 on page 4-17 shows the data flow for three loopback configuration paths, including no

loopback.

Table 4-8 Using loopback Commands

Command Function Example

loopback local Sets the interface into local loopback mode.

Local loopback loops the router output data

back toward the router at the framer.

Router(config)# interface serial 2/0

Router(config-if)# loopback local

loopback network line Sets the interface into network line loopback

mode. Network line loopback loops the data

back toward the network (before the framer).

Router(config)# interface serial 2/0

Router(config-if)# loopback network

line

loopback network payload Sets the interface into network payload

loopback mode. Network payload loopback

loops just the payload data back toward the

network at the E3 framer.

Router(config)# interface serial 2/0

Router(config-if)# loopback network

payload

loopback dte Sets the interface into loopback data terminal

equipment (DTE) mode. Loopback DTE

loops the router output data back toward the

router (after the LIU).

Router(config)# interface serial 2/0

Router(config-if)# loopback dte

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