Juniper Networks J-Series manual Monitoring Routing Information, Mtu

Chapter 7: Monitoring the Router and Routing Operations

Table 51: Summary of Key Interfaces Output Fields (continued)

Field	Values
Admin	Whether the interface is enabled up (Up) or disabled
State	(Down).

MTU	Maximum transmission unit (MTU) size on the physical
	interface.
Speed	Speed at which the interface is running.
Current	Configured media access control (MAC) address.
Address
Hardware	Hardware MAC address.
Address
Last	Date, time, and how long ago the interface changed
Flapped	state from Down to Up.
Active	List of any active alarms on the interface.
Alarms

Traffic	Number of packets and bytes received and transmitted
Statistics	on the physical interface.
Input Errors	Input errors on the interface. (See the following rows
	of this table for specific error types.)
Drops	Number of packets dropped by the output queue.
Framing	Sum of ATM Adaptation Layer (AAL5) packets that
errors	have frame check sequence (FCS) errors, AAL5 packets
	that have reassembly timeout errors, and AAL5
	packets that have length errors.
Policed	Number of packets dropped as a result of routing
discards	policies configured on the interface.

Additional Information

Interfaces are enabled by default. To disable an interface:

■In the J-Web configuration editor, select the Disable check box on the Interfaces>interfaces-namepage.

■In the CLI configuration editor, add the disable statement at the [edit interfaces interfaces-name]level of the configuration hierarchy

Configure alarms on interfaces as follows:

■In the J-Web configuration editor, on the Chassis>Alarm>interface-typepage

■In the CLI configuration editor, with the alarm statement at the [edit chassis] level of the configuration hierarchy

If the interface is saturated, this number increments once for every packet that is dropped by the Services Router's random early detection (RED) mechanism.

Monitoring Routing Information

The J-Web interface provides information about routing tables and routing protocols.

Using the Monitoring Tools ■ 115