Juniper Networks J-Series manual Using CLI Diagnostic Commands, Pinging Hosts from the CLI

J-series™ Services Router Administration Guide

Table 115: J-Web Packet Capture Results and Output Summary (continued)

FieldDescription

data size Size of the packet (in bytes).

Using CLI Diagnostic Commands

Because the CLI is a superset of the J-Web interface, you can perform certain tasks only through the CLI. For an overview of the CLI operational mode commands, along with instructions for filtering command output, see “CLI Diagnostic Commands Overview” on page 211.

This section contains the following topics:

■Pinging Hosts from the CLI on page 230

■Checking MPLS Connections from the CLI on page 232

■Tracing Unicast Routes from the CLI on page 237

■Tracing Multicast Routes from the CLI on page 240

■Displaying Log and Trace Files from the CLI on page 244

■Monitoring Interfaces and Traffic from the CLI on page 245

Pinging Hosts from the CLI

Use the CLI ping command to verify that a host can be reached over the network. This command is useful for diagnosing host and network connectivity problems. The Services Router sends a series of ICMP echo (ping) requests to a specified host and receives ICMP echo responses.

Alternatively, you can use the J-Web interface. (See “Using the J-Web Ping Host

Tool” on page 216.)

Enter the ping command with the following syntax. Table 116 on page 230 describes the ping command options.

user@host> ping host <interface source-interface><bypass-routing> <count number> <do-not-fragment> <inet inet6> <interval seconds> <loose-source [hosts]> <no-resolve> <pattern string> <rapid> <record-route>

<routing-instancerouting-instance-name> <size bytes> <source source-address>

<strict> <strict-source [hosts]> <tos number> <ttl number> <wait seconds> <detail> <verbose>

To quit the ping command, press Ctrl-C.

Table 116: CLI ping Command Options

OptionDescription

host Pings the hostname or IP address you specify.

230■ Using CLI Diagnostic Commands