Check Physical Interfaces on a Router

Purpose

When you check the physical interfaces on a router, you gather information to quickly diagnose problems.

To check the physical interfaces on a router, follow these steps:

Display Summary Interface Information

Purpose

By displaying a summary of the interfaces on a router, you begin the process of isolating problems when they occur.

Action

To display a summary of all interfaces on a router or a specific group of interfaces, use one of the following Junos OS command-line interface (CLI) operational mode commands:

user@host> show interfaces terse user@host> show interfaces terse interface-name

Sample Output

The following sample output shows all interfaces on a router:

user@host> show interfaces terse
Interface               Admin Link Proto Local                 Remote
so-5/0/0                up    down
t3-6/0/0                up    down
t3-6/0/1                up    down
t3-6/0/2                up    down
t3-6/0/3                up    down
at-6/1/0                up    down
fe-7/0/0                up    up  
fe-7/0/0.0              up    up   vpls 
fe-7/0/1                up    up  
fe-7/0/2                up    up  
fe-7/0/3                up    up  
t3-7/1/0                up    down
t3-7/1/1                up    down
t3-7/1/2                up    down
t3-7/1/3                up    down
dsc                     up    up  
fxp0                    up    up  
fxp0.0                  up    up   inet  10.168.4.32/24 
fxp1                    up    up  
fxp1.0                  up    up   tnp   4               
gre                     up    up  
ipip                    up    up  
lo0                     up    up  
lo0.0                   up    up   inet  127.0.0.1           --> 0/0
lsi                     up    up  
mtun                    up    up  
pimd                    up    up  
pime                    up    up  
tap                     up    up

The following sample output is for a specific group of SONET interfaces on a router:

Sample Output

user@host> show interfaces terse so*
so-0/0/0        up    up
so-0/0/0.1      up    down inet  10.1.13.2/30
                           iso
so-0/0/0.2      up    down inet  10.1.23.2/30
                           iso
so-0/0/0.4      up    down inet  10.1.34.1/30
                           iso
so-0/0/0.5      up    up   inet  10.1.35.1/30
                           iso
so-0/0/1        up    up
so-0/0/2        up    up
so-0/0/3        up    up
                           iso
                           iso
                           iso
                           iso
                           iso
                           iso
47.0005.80ff.f800.0000.0108.0001.0102.5524.5219.00

Meaning

The sample output shows summary information about the interfaces on the router listed in order of type of interface. The information includes the name of the interface, whether it is turned on (up) or off (down), whether the state of the link is up or down, the protocol configured on the interface, the local address of the interface, and the address of the remote side of the connection if the interface is a point-to-point interface.

Display Detailed Interface Information

Purpose

Detailed interface information is useful when you need to further investigate the status of an interface after you have determined that there might be a problem.

Action

To display detailed information about the status of an interface, use the following Junos OS CLI operational mode command:

user@host> show interfaces interface-name extensive

The sample output is for an ATM interface. The fields vary depending on the type of interface.

Sample Output

user@host> show interfaces at-7/0/0 extensive
Physical interface: at-7/0/0, Enabled, Physical link is Up
  Interface index: 101, SNMP ifIndex: 106, Generation: 100
  Description: bangkok51 at-1/1/0
  Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, SONET mode, 
Speed: OC12, Loopback: None,
  Payload scrambler: Enabled
  Device flags   : Present Running
  Link flags     : None
  Hold-times     : Up 0 ms, Down 0 ms
  Current address: 00:90:69:10:c7:72
  Last flapped   : 2002-05-23 12:12:18 PDT (1d 03:20 ago)
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :              9526697                  744 bps
   Output bytes  :             10458384                  496 bps
   Input  packets:               129969                    0 pps
   Output packets:               126940                    0 pps
  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
  Output errors:
    Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0
  SONET alarms   : None
  SONET defects  : None
  SONET PHY:            Seconds        Count  State
    PLL Lock                  0            0  OK
    PHY Light                 0            0  OK
  SONET section:
    BIP-B1                    1            9
    SEF                       0            0  OK
    LOS                       0            0  OK
    LOF                       0            0  OK
    ES-S                      1
    SES-S                     0
    SEFS-S                    0
  SONET line:
    BIP-B2                    1          183
    REI-L                     1          323
    RDI-L                     0            0  OK
    AIS-L                     0            0  OK
    BERR-SF                   0            0  OK
    BERR-SD                   0            0  OK
    ES-L                      1
    SES-L                     0
    UAS-L                     0
    ES-LFE                    1
    SES-LFE                   0
    UAS-LFE                   0
  SONET path:
    BIP-B3                    1           31
    REI-P                     1          216
    LOP-P                     0            0  OK
    AIS-P                     0            0  OK
    RDI-P                     0            0  OK
    UNEQ-P                    0            0  OK
    PLM-P                     0            0  OK
    ES-P                      1
    SES-P                     0
    UAS-P                     0
    ES-PFE                    1
    SES-PFE                   0
    UAS-PFE                   0
  Received SONET overhead:
    F1      : 0x00, J0      : 0x00, K1      : 0x00, K2      : 0x00
    S1      : 0x00, C2      : 0x13, C2(cmp) : 0x13, F2      : 0x00
    Z3      : 0x00, Z4      : 0x00, S1(cmp) : 0x00, V5      : 0x00
    V5(cmp) : 0x00
  Transmitted SONET overhead:
    F1      : 0x00, J0      : 0x01, K1      : 0x00, K2      : 0x00
    S1      : 0x00, C2      : 0x13, F2      : 0x00, Z3      : 0x00
    Z4      : 0x00, V5      : 0x00
  ATM status:
    HCS state:     Sync
    LOC      :       OK
  ATM Statistics:
    Uncorrectable HCS errors: 77, Correctable HCS errors: 5, Tx cell 
FIFO overruns: 0,
    Rx cell FIFO overruns: 1, Rx cell FIFO underruns: 0, Input cell 
count: 421980,
    Output cell count: 139110927341, Output idle cell count: 1671702365, 
Output VC queue drops: 0,
    Input no buffers: 0, Input length errors: 0, Input timeouts: 0, 
Input invalid VCs: 143301,
    Input bad CRCs: 0, Input OAM cell no buffers: 0
  Packet Forwarding Engine configuration:
    Destination slot: 7
    CoS transmit queue          Bandwidth          Buffer     Priority   
Limit
                              %          bps   %        bytes
    0 best-effort             0            0   0            0      
low    none
    1 expedited-forwarding    0            0   0            0      
low    none
    2 assured-forwarding      0            0   0            0      
low    none
    3 network-control         0            0   0            0      
low    none
Logical interface at-7/0/0.100 (Index 49) (SNMP ifIndex 143) (Generation 76)
    Flags: Point-To-Point Inverse-ARP SNMP-Traps Encapsulation: ATM-SNAP
    Traffic statistics:
     Input  bytes  :                 9993
     Output bytes  :                16246
     Input  packets:                  151
     Output packets:                  136
    Local statistics:
     Input  bytes  :                 9993
     Output bytes  :                16246
     Input  packets:                  151
     Output packets:                  136
    Transit statistics:
     Input  bytes  :                    0                    0 bps
     Output bytes  :                    0                    0 bps
     Input  packets:                    0                    0 pps
     Output packets:                    0                    0 pps
    Protocol inet, MTU: 4470, Flags: None, Generation: 200 Route table: 0
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.9.140.1, Local: 10.9.140.2, Broadcast: 
Unspecified, Generation: 106
    Protocol iso, MTU: 4470, Flags: None, Generation: 201 Route table: 0
    Protocol mpls, MTU: 4458, Flags: None, Generation: 202 Route table: 0
    VCI 0.200
      Flags: Active, Inverse-ARP, OAM, Shaping
      VBR, Peak: 12mbps, Sustained: 10mbps, Burst size: 24, Queue length: 0
      OAM, Period 10 sec, Up count: 5, Down count: 4
      Total down time: 0 sec, Last down: Never
      ATM per-VC transmit statistics:
       Tail queue packet drops: 0
     OAM F5 cell statistics:
      Total received: 49, Total sent: 49
      Loopback received: 49, Loopback sent: 49
      Last received: 00:00:08, Last sent: 00:00:08
      RDI received: 0, RDI sent: 0
      AIS received: 0
      Traffic statistics:
       Input  bytes  :                 9993
       Output bytes  :                16246
       Input  packets:                  151
       Output packets:                  136

Meaning

The sample output shows static status information about this particular ATM interface. For examples of sample output for supported interfaces, see the Junos Network Interfaces Configuration Guide.

Table 23 lists the interface types supported by the Junos OS and shows the interface name as it appears in the output.

Table 23: Interface Types Supported by the Junos OS

Interface Group	Interface Type	Format of interface-name
ATM	ATM	at-fpc/pic/port
Channelized	Channelized DS3 to DS0 Channelized DS3 to DS1 Channelized E1 Channelized OC3 to T1 Channelized OC12 to DS3 Channelized STM1 to E1	ds-fpc/pic/port :T1channel:DS-0 channel t1 t1-fpc/pic/port:channel t1 ds-fpc/pic/port:ds-0 channel e1 t3-fpc/pic/port:channel e1-fpc/pic/port:channel
T1, T3, E1, E3	E1 E3 T1 T3	e1-fpc/pic/port e3-fpc/pic/port t1-fpc/pic/port t3-fpc/pic/port
Ethernet	Aggregated Ethernet Fast Ethernet Gigabit Ethernet 10-Gigabit Ethernet Internal Ethernet Management Ethernet	ae-fpc/pic/port fe-fpc/pic/port ge-fpc/pic/port ge-fpc/pic/port fxp fxp
Multilink	Frame Relay PPP	ml-fpc/pic/port ml-fpc/pic/port
SONET/SDH	Aggregated SONET/SDH SONET/SDH	as-fpc/pic/port so-fpc/pic/port
Other	Encryption GRE tunnel IP-IP tunnel Loopback	es-fpc/pic/port:es gr-fpc/pic/port ip-fpc/pic/port lo