Displaying the status of the ATM interface provides the information you need to determine whether the physical link is up or down.
To verify that the status of the ATM interface is up, use the following JUNOS CLI operational mode command:
Sample Output 1
The following sample output is for an OC3 ATM interface:
user@host> show interfaces at-2/0/0
Physical interface: at-2/0/0, Enabled, Physical link is Up
Interface index: 22, SNMP ifIndex: 42
Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, SONET mode, Speed: OC3 , Loopback: Local, Payload scrambler: Enabled
Device flags : Present Running
Link flags : None
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
SONET alarms : None
SONET defects : None
Logical interface at-2/0/0.0 (Index 29) (SNMP ifIndex 49)
Flags: Point-To-Point SNMP-Traps Encapsulation: ATM-SNAP
Input packets : 0
Output packets: 0
Protocol inet, MTU: 4470, Flags: None
Addresses, Flags: Is-Preferred Is-Primary
Destination: 192.168.1.0/30, Local: 192.168.1.1
VCI 1.100
Flags: Active
Total down time: 0 sec, Last down: Never
Traffic statistics:
Input packets: 0
Output packets: 0
Sample Output 2
The following sample output is for a T3 ATM interface:
user@host> show interfaces at-0/1/0 Physical interface: at-0/1/0, Enabled, Physical link is Up Interface index: 90, SNMP ifIndex: 18 Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, Speed: T3 , Loopback: None, Payload scrambler: Enabled, Mode: C/Bit parity, Line buildout: 10, ATM Encapsulation: PLCP Device flags : Present Running Link flags : None Current address: 00:90:69:0c:c0:1f Last flapped : 2002-08-14 16:25:07 UTC (00:00:42 ago) Input rate : 0 bps (0 pps) Output rate : 0 bps (0 pps) Active alarms : None Active defects : None
Sample Output 3
The following sample output is for an OC3 ATM interface:
user@host> show interfaces at-2/0/1
Physical interface: at-2/0/1, Enabled, Physical link is Down
Interface index: 23, SNMP ifIndex: 43
Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, SONET mode, Speed: OC3 , Loopback: None, Payload scrambler: Enabled
Device flags : Present Running Down
Link flags : None
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
SONET alarms : LOL, LOS
SONET defects : LOL, LOF, LOS, SEF, AIS-L, AIS-P, RDI-P, PLM-P
Logical interface at-2/0/1.10 (Index 30) (SNMP ifIndex 65)
Flags: Device-Down Point-To-Point SNMP-Traps Encapsulation: ATM-SNAP
Input packets : 0
Output packets: 0
Protocol inet, MTU: 4470, Flags: None
Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
Destination: 192.168.100.0/30, Local: 192.168.100.1
VCI 2.100
Flags: Active
Total down time: 0 sec, Last down: Never
Traffic statistics:
Input packets: 0
Output packets: 0
Sample Output 4
The following sample output is for a T3 ATM interface:
user@host> show interfaces at-0/1/0 Physical interface: at-0/1/0, Enabled, Physical link is Down Interface index: 90, SNMP ifIndex: 18 Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, Speed: T3 , Loopback: None, Payload scrambler: Enabled, Mode: C/Bit parity, Line buildout: 10, ATM Encapsulation: PLCP Device flags : Present Running Down Link flags : None Current address: 00:90:69:0c:c0:1f Last flapped : 2002-08-09 11:36:15 UTC (5d 04:14 ago) Input rate : 0 bps (0 pps) Output rate : 0 bps (0 pps) Active alarms : PLL, LOF, LOS Active defects : PLL, LOF, LOS
Sample output 1 shows that the physical link is up and there are no SONET alarms or defects.
Sample output 2 shows that the physical link is up and there are no active alarms or defects.
Sample output 3 shows that the physical link, the device flags, and interface flags are down, and that there are SONET alarms and defects. When you see that the physical link is down, there may be a problem with the port.
Sample output 4 shows that the physical link, the device flags, and interface flags are down, and that there are active alarms and defects. When you see that the physical link is down, there may be a problem with the port.
For more information about problem situations and actions to take for a physical link that is down, see Table 25.
Table 25: Problems and Solutions for a Physical Link That Is Down
