Display the Status of a Specific Fast Ethernet or Gigabit Ethernet Interface
Purpose
To display the status of a specific Fast Ethernet or Gigabit Ethernet interface when you need to investigate its status further, use the following Junos OS CLI operational mode command:
Action
Sample Output 1
The following sample output is for a Fast Ethernet interface with the physical link up:
user@host> show interfaces fe-2/1/0
Physical interface: fe-2/1/0, Enabled, Physical link is Up
Interface index: 31, SNMP ifIndex: 35
Description: customer connection
Link-level type: Ethernet, MTU: 1514, Source filtering: Disabled
Speed: 100mbps, Loopback: Disabled, Flow control: Enabled
Device flags : Present Running
Interface flags: SNMP-Traps
Link flags : None
Current address: 00:90:69:86:71:1b, Hardware address: 00:90:69:86:71:1b
Input rate : 25768 bps (11 pps), Output rate: 1576 bps (3 pps)
Active alarms : None
Active defects : None
Logical interface fe-2/1/0.0 (Index 2) (SNMP ifIndex 43)
Flags: SNMP-Traps, Encapsulation: ENET2
Protocol inet, MTU: 1500, Flags: Is-Primary
Addresses, Flags: Is-Preferred Is-Primary
Destination: 10.116.151.218/29, Local: 10.119.115.217
Broadcast: 10.116.151.225
Sample Output 2
The following output is for a Gigabit Ethernet interface with the physical link up:
user@host> show interfaces ge-3/1/0
Physical interface: ge-3/1/0, Enabled, Physical link is Up
Interface index: 41, SNMP ifIndex: 55
Description: customer connection
Link-level type: Ethernet, MTU: 1514, Source filtering: Disabled
Speed: 1000mbps, Loopback: Disabled, Flow control: Enabled
Device flags : Present Running
Interface flags: SNMP-Traps
Link flags : None
Current address: 00:90:69:85:71:99, Hardware address: 00:90:69:85:71:99
Input rate : 7412216 bps (1614 pps), Output rate: 2431184 bps (1776 pps)
Active alarms : None
Active defects : None
Logical interface ge-3/1/0.0 (Index 11) (SNMP ifIndex 57)
Flags: SNMP-Traps, Encapsulation: ENET2
Protocol inet, MTU: 1500
Addresses, Flags: Is-Preferred Is-Primary
Destination: 10.117.65.192/30, Local: 10.115.65.193
Broadcast: 10.115.65.195
Meaning
The first line of sample output 1 and 2 shows that the physical link is up. This means that the physical link is healthy and can pass packets. Further down the sample output, look for active alarms and defects. If you see active alarms or defects, to further diagnose the problem, see Step 3, Display Extensive Status Information for a Specific Fast Ethernet or Gigabit Ethernet Interface, to display more extensive information about the Fast Ethernet interface and the physical interface that is down.
