Verifying Interface Configuration

To verify an interface configuration, perform these tasks:

Purpose

By using the ping tool on each peer address in the network, verify that all interfaces on the Services Router are operational.

Action

For each interface on the Services Router:

1. In the J-Web interface, select Diagnose>Ping Host.
2. In the Remote Host box, type the address of the interface for which you want to verify the link state.
3. Click Start. Output appears on a separate page.

Sample Output

PING 10.10.10.10 : 56 data bytes
64 bytes from 10.10.10.10: icmp_seq=0 ttl=255 time=0.382 ms
64 bytes from 10.10.10.10: icmp_seq=1 ttl=255 time=0.266 ms

What it Means

If the interface is operational, it generates an ICMP response. If this response is received, the round-trip time in milliseconds is listed in the time field. For more information about the output, see the J-series Services Router Administration Guide.

For more information about using the J-Web interface to ping a host, see the J-series Services Router Administration Guide.

For information about the ping command, see the J-series Services Router Administration Guide or the JUNOS Protocols, Class of Service, and System Basics Command Reference.

Purpose

Verify that the interface properties are correct.

Action

From the CLI, enter the show interfaces detail command.

Sample Output

Physical interface: fe-1/0/0, Enabled, Physical link is Up
  Interface index: 134, SNMP ifIndex: 27, Generation: 17
  Link-level type: Ethernet, MTU: 1514, Speed: 100mbps, Loopback: Disabled,
  Source filtering: Disabled, Flow control: Enabled
  Device flags   : Present Running
  Interface flags: SNMP-Traps 16384
  Link flags     : None
  CoS queues     : 4 supported
  Hold-times     : Up 0 ms, Down 0 ms
  Current address: 00:90:69:87:44:9d, Hardware address: 00:90:69:87:44:9d
  Last flapped   : 2004-08-25 15:42:30 PDT (4w5d 22:49 ago)
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :                    0                    0 bps
   Output bytes  :                    0                    0 bps
   Input  packets:                    0                    0 pps
   Output packets:                    0                    0 pps
  Queue counters:       Queued packets  Transmitted packets      Dropped packets
    0 best-effort                    0                    0                    0
    1 expedited-fo                   0                    0                    0
    2 assured-forw                   0                    0                    0
    3 network-cont                   0                    0                    0
  Active alarms  : None
  Active defects : None

What it Means

The output shows a summary of interface information. Verify the following information:

• The physical interface is Enabled. If the interface is shown as Disabled, do either of the following:
  • In the CLI configuration editor, delete the disable statement at the [edit interfaces interface-name] level of the configuration hierarchy.
  • In the J-Web configuration editor, clear the Disable check box on the Interfaces>interface-name page.
• The physical link is Up. A link state of Down indicates a problem with the interface module, interface port, or physical connection (link-layer errors).
• The Last Flapped time is an expected value. The Last Flapped time indicates the last time the physical interface became unavailable and then available again. Unexpected flapping indicates likely link-layer errors.
• The traffic statistics reflect expected input and output rates. Verify that the number of inbound and outbound bytes and packets matches expected throughput for the physical interface. To clear the statistics and see only new changes, use the clear interfaces statistics interface-name command.

For more information about show interfaces detail, see the JUNOS Network and Services Interfaces Command Reference.

Purpose

Verify that the interface properties are correct.

Action

From the CLI, enter the show interfaces interface-name extensive command.

Sample Output

Physical interface: at-4/0/0, Enabled, Physical link is Up
  Interface index: 141, SNMP ifIndex: 38, Generation: 102
  Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, ADSL mode, Speed: ADSL
  Device flags   : Present Running
  Link flags     : None
  CoS queues     : 8 supported
  Hold-times     : Up 0 ms, Down 0 ms
  Current address: 00:90:69:87:44:9d, Hardware address: 00:90:69:87:44:9d
  Last flapped   : 2005-01-25 15:42:30 PDT (4w5d 22:49 ago)
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :                    0                    
   Output bytes  :                    0                    
   Input  packets:                    0                    
   Output packets:                    0                    
   Input errors:
   Errors: 0, Drops: 0, Invalid VCs: 0, Framing Errors: 0, Policed Discards: 0, 
   L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts:0, Resource errors:0   Output erros:
   Carrier transitions: 9, Errors: 0, Drops:0, Aged packets: 0, MTU errors:0, 
   ADSL alarms: none
   ADSL defects: none
   ADSL media:						 Seconds			Count		State
   LOF									0				 			0			OK
   LOS									0				 			0			OK
   LOM									0				 			0			OK
   LOP									0				 			0			OK
   LOCDI								0				 			0			OK
   LOCDNI								0				 			0			OK
   ADSL Status:
   Modem status:Showtime
   DSL Mode:   Auto
   ADSL Statistics:					 ATU—R				ATU—C
   Attainable Bit Rate (kbps):			0				  0
   Attenuation (dB):				   8				  0
   Capacity used (%):				   0				  0
   Noise Margin (dB):				   24				  33
   Output Power )dBm):				   24				  24
   									Interleave	Fast	Interleave	Fast
   Bitrate (kbps):						0		8128		0		832
   CRC:									0		  1			0		  0
   FEC:									0		  0			0		  0
   HEC:									0		  0			0		  0
   Received Cells:						0		164548
   Transmitted Cells:					0		263100
  ATM status:
   HCS state:	Hunt
   LOC:			OK	
  ATM Statistics:
   Uncorrectable HCS errors:0, Correctable HCS errors:0,
   Tx cell FIFO overruns:0,Rx cell overruns:0,
   Rx cell FIFO underruns:0, Input cell count:0,
   Output cell count:202811720590, Output idle cell count:202811720562
   Output VC queue drops:0, Input no buffers:0, Input length errors:0,
   Input timeouts:0, Input valid VCs: 0, Input bad CRCs:0,
   Input OAM cell no buffers:0
  Packet Forwarding Engine configuration:
   Destination Slot:0
   CoS transmit queue		Bandwidth		Buffer	Priority		Limit %bps	%bytes
	0 best—effort					95				14774400		95				0	 low   none
   3 network—control			 5				7776000		5				0	 low	 none

What it Means

The output shows a summary of interface information. Verify the following information:

• The physical interface is Enabled. If the interface is shown as Disabled, do either of the following:
  • In the CLI configuration editor, delete the disable statement at the [edit interfaces interface-name] level of the configuration hierarchy.
  • In the J-Web configuration editor, clear the Disable check box on the Interfaces>interface-name page.
• The physical link is Up. A link state of Down indicates a problem with the interface module, interface port, or physical connection (link-layer errors).
• The Last Flapped time is an expected value. The Last Flapped time indicates the last time the physical interface became unavailable and then available again. Unexpected flapping indicates likely link-layer errors.
• The traffic statistics reflect expected input and output rates. Verify that the number of inbound and outbound bytes and packets matches expected throughput for the physical interface. To clear the statistics and see only new changes, use the clear interfaces statistics interface-name command.
• No ADSL alarms and defects appear that can render the interface unable to pass packets. When a defect persists for a certain amount of time, it is promoted to an alarm. The following are ADSL-specific alarms:
  • LOCDI–Loss of cell delineation for interleaved channel
  • LOCDNI—Loss of cell delineation for non-interleaved channel
  • LOF—Loss of frame
  • LOM—Loss of multiframe
  • LOP—Loss of pointer
  • LOS—Loss of signal

Examine the operational statistics for an ADSL interface. Statistics in the ATU-R (ADSL transceiver unit–remote) column are for the far end. Statistics in the ATU-C (ADSL transceiver unit–central office) column are for the near end.

• Attenuation (dB)—Reduction in signal strength measured in decibels.
• Capacity used (%)—Amount of ADSL usage in %.
• Noise Margin (dB)—Maximum extraneous signal allowed without causing the output to deviate from an acceptable level.
• Output Power (dBm)—Amount of power used by the ADSL interface.
• Bit Rate (kbps)—Data transfer speed on the ADSL interface.

For more information about show interfaces extensive, see the JUNOS Network and Services Interfaces Command Reference.