Interface Status Codes and IP Addresses
 


Interface commands

show interfaces

Use the show interfaces EXEC command to display statistics for all interfaces configured on the router or access server. The resulting output varies, depending on the network for which an interface has been configured.

show interfaces [type number] [first] [last] [accounting]

Cisco 7200 Series and Cisco 7500 Series with a Packet over SONET Interface Processor

show interfaces [type slot/port] [accounting]

Cisco 7500 Series with Ports on VIPs

show interfaces [type slot/port-adapter/port] [ethernet | serial]

Syntax Description

 

type

(Optional) Interface type. Allowed values for type include async, bri0, ethernet, fastethernet, fddi, hssi, loopback, null, serial, tokenring, and tunnel.

For the Cisco 4000 series routers, type can be e1, ethernet, fastethernet, fddi, serial, t1, and token. For the Cisco 4500 series routers, type can also include atm.

For the Cisco 7000 family, type can be atm, e1, ethernet, fastethernet, fddi, serial, t1, and tokenring.

For the Cisco 7500 series type can also include pos.

number

(Optional) Port number on the selected interface.

first last

(Optional) For the Cisco 2500 and 3000 series routers ISDN Basic Rate Interface (BRI) only. The argument first can be either 1 or 2. The argument last can only be 2, indicating B channels 1 and 2.

D-channel information is obtained by using the command without the optional arguments.

accounting

(Optional) Displays the number of packets of each protocol type that has been sent through the interface.

slot

(Optional) Refer to the appropriate hardware manual for slot and port information.

port

(Optional) Refer to the appropriate hardware manual for slot and port information.

port -adapter

(Optional) Refer to the appropriate hardware manual for information about port adapter compatibility.

Command Modes

EXEC

Command History

 
Release
Modification

10.0

This command was introduced.

Usage Guidelines

The show interfaces command displays statistics for the network interfaces. The resulting display on the Cisco 7200 series routers shows the interface processors in slot order. If you add interface processors after booting the system, they will appear at the end of the list, in the order in which they were inserted.

If you use the show interfaces command on the Cisco 7200 series routers without the slot/port arguments, information for all interface types will be shown. For example, if you type show interfaces ethernet you will receive information for all ethernet, serial, Token Ring, and FDDI interfaces. Only by adding the type slot/port argument can you specify a particular interface.

If you enter a show interfaces command for an interface type that has been removed from the router or access server, interface statistics will be displayed accompanied by the following text: "Hardware has been removed."

If you use the show interfaces command on a router or access server for which interfaces are configured to use weighted fair queueing through the fair-queue interface command, additional information is displayed. This information consists of the current and high-water mark number of flows.

You will use the show interfaces command frequently while configuring and monitoring devices. The various forms of the show interfaces commands are described in detail in the sections immediately following this command.

Examples

The following is an example from the show interfaces command. Because your display will depend on the type and number of interface cards in your router or access server, only a portion of the display is shown.

Note If an asterisk (*) appears after the throttles counter value, it means that the interface was throttled at the time the command was run.

Router# show interfaces

Ethernet 0 is up, line protocol is up
  Hardware is MCI Ethernet, address is 0000.0c00.750c (bia 0000.0c00.750c)
  Internet address is 131.108.28.8, subnet mask is 255.255.255.0
  MTU 1500 bytes, BW 10000 Kbit, DLY 100000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 4:00:00
  Last input 0:00:00, output 0:00:00, output hang never
  Last clearing of "show interface" counters 0:00:00
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  Five minute input rate 0 bits/sec, 0 packets/sec
  Five minute output rate 2000 bits/sec, 4 packets/sec
     1127576 packets input, 447251251 bytes, 0 no buffer
     Received 354125 broadcasts, 0 runts, 0 giants, 57186* throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     5332142 packets output, 496316039 bytes, 0 underruns
     0 output errors, 432 collisions, 0 interface resets, 0 restarts
---More---

Example with Custom Output Queuing

The following shows partial sample output when custom output queuing is enabled:

Last clearing of "show interface" counters 0:00:06

 

Input queue: 0/75/0 (size/max/drops); Total output drops: 21

 

Output queues: (queue #: size/max/drops)
     0: 14/20/14  1: 0/20/6  2: 0/20/0 3: 0/20/0 4: 0/20/0 5: 0/20/0 
     6: 0/20/0 7: 0/20/0  8: 0/20/0  9: 0/20/0  10: 0/20/0  

When custom queuing is enabled, the drops accounted for in the output queues result from bandwidth limitation for the associated traffic and leads to queue length overflow. Total output drops include drops on all custom queues as well as the system queue. Fields are described with the Weighted Fair Queuing output in Table 24.

Example including Weighted-Fair-Queuing Output

For each interface on the router or access server configured to use weighted fair queuing, the show interfaces command displays the information beginning with Input queue: in the following display:

Router# show interfaces

Ethernet 0 is up, line protocol is up
  Hardware is MCI Ethernet, address is 0000.0c00.750c (bia 0000.0c00.750c)

 

  Internet address is 131.108.28.8, subnet mask is 255.255.255.0

 

  MTU 1500 bytes, BW 10000 Kbit, DLY 100000 usec, rely 255/255, load 1/255

 

  Encapsulation ARPA, loopback not set, keepalive set (10 sec)

 

  ARP type: ARPA, ARP Timeout 4:00:00

 

  Last input 0:00:00, output 0:00:00, output hang never

 

  Last clearing of "show interface" counters 0:00:00

 

  Output queue 0/40, 0 drops; input queue 0/75, 0 drops

 

  Five minute input rate 0 bits/sec, 0 packets/sec

 

  Five minute output rate 2000 bits/sec, 4 packets/sec

 

     1127576 packets input, 447251251 bytes, 0 no buffer

 

     Received 354125 broadcasts, 0 runts, 0 giants, 57186* throttles

 

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

 

     5332142 packets output, 496316039 bytes, 0 underruns

 

     0 output errors, 432 collisions, 0 interface resets, 0 restarts 
Input queue: 0/75/0 (size/max/drops); Total output drops: 0 
Output queue: 7/64/0 (size/threshold/drops) 
				     Conversations 2/9 (active/max active) 

Table 24 describes the input queue and output queue fields shown in the preceding display.

Table 24 Weighted-Fair-Queuing Output Fields

 
Field
Description

Input queue:

 

size

Current size of the input queue.

max

Maximum size of the queue.

drops

Number of messages discarded in this interval.

Total output drops

Total number of messages discarded in this session.

Output queue:

 

size

Current size of the output queue.

threshold

Congestive-discard threshold. Number of messages in the queue after which new messages for high-bandwidth conversations are dropped.

drops

Number of dropped messages.

Conversations: active

Number of currently active conversations.

Conversations: max active

Maximum number of concurrent conversations allowed.

Example with Accounting Option

 

To display the number of packets of each protocol type that have been sent through all configured interfaces, use the show interfaces accounting EXEC command. When you use the accounting option, only the accounting statistics are displayed.


Note Except for protocols that are encapsulated inside other protocols, such as IP over X.25, the accounting option also shows the total of all bytes sent and received, including the MAC header. For example, it totals the size of the Ethernet packet or the size of a packet that includes HDLC encapsulation.


 

Table 25 lists the protocols for which per-packet accounting information is kept.

 

Table 25 Per-Packet Counted Protocols 

 
Protocol
Notes

Apollo

No note.

AppleTalk

No note.

ARP

For IP, Apollo, Frame Relay, SMDS.

CLNS

No note.

DEC MOP

The routers use MOP packets to advertise their existence to Digital Equipment Corporation machines that use the MOP protocol. A router periodically broadcasts MOP packets to identify itself as a MOP host. This results in MOP packets being counted, even when DECnet is not being actively used.

DECnet

No note.

HP Probe

No note.

IP

No note.

LAN Manager

LAN Network Manager and IBM Network Manager.

Novell

No note.

Serial Tunnel

SDLC.

Spanning Tree

No note.

SR Bridge

No note.

Transparent Bridge

No note.

VINES

No note.

XNS

No note.

 

 

Example with DWRED

 

The following is sample output from the show interfaces command when DWRED is enabled on an interface. Notice that the packet drop strategy is listed as "VIP-based weighted RED."

 

Router# show interfaces hssi0/0/0

 

Hssi0/0/0 is up, line protocol is up

 

  Hardware is cyBus HSSI

 

  Description: 45Mbps to R1

 

Internet address is 200.200.14.250/30

 

MTU 4470 bytes, BW 45045 Kbit, DLY 200 usec, rely 255/255, load 1/255

 

Encapsulation HDLC, loopback not set, keepalive set (10 sec)

 

Last input 00:00:02, output 00:00:03, output hang never

 

Last clearing of "show interface" counters never

 

Queueing strategy: fifo

 

Packet Drop strategy: VIP-based weighted RED

 

Output queue 0/40, 0 drops; input queue 0/75, 0 drops

 

5 minute input rate 0 bits/sec, 0 packets/sec

 

5 minute output rate 0 bits/sec, 0 packets/sec

 

1976 packets input, 131263 bytes, 0 no buffer

 

Received 1577 broadcasts, 0 runts, 0 giants

 

0 parity

 

4 input errors, 4 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

 

1939 packets output, 130910 bytes, 0 underruns

 

0 output errors, 0 applique, 3 interface resets

 

0 output buffers copied, 0 interrupts, 0 failures

 

Example with ALC

 

The following is sample output from the show interfaces command for the serial 2 interface when ALC is enabled.

 

Router# show interfaces serial 2

 

Serial2 is up, line protocol is up

 

Hardware is CD2430

 

MTU 1500 bytes, BW 115 Kbit, DLY 20000 usec, rely 255/255, load 1/255

 

Encapsulation ALC, loopback not set

 

Full-duplex enabled.

 

     ascus in UP state: 42, 46

 

     ascus in DOWN state: 

 

     ascus DISABLED: 

 

Last input never, output never, output hang never

 

Last clearing of "show interface" counters never

 

Queueing strategy: fifo

 

Output queue 0/40, 0 drops; input queue 0/75, 0 drops

 

5 minute input rate 0 bits/sec, 0 packets/sec

 

5 minute output rate 0 bits/sec, 0 packets/sec

 

0 packets input, 0 bytes, 0 no buffer

 

Received 0 broadcasts, 0 runts, 0 giants

 

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

 

0 packets output, 0 bytes, 0 underruns

 

0 output errors, 0 collisions, 3 interface resets

 

0 output buffer failures, 0 output buffers swapped out

 

DCD=down  DSR=down  DTR=down  RTS=down  CTS=down

 

Example with SDLC

 

The following is sample output from the show interfaces command for an SDLC primary interface supporting the SDLC function:

 

Router# show interfaces

 

Serial 0 is up, line protocol is up

 

 Hardware is MCI Serial

 

 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255

 

 Encapsulation SDLC-PRIMARY, loopback not set

 

      Timers (msec): poll pause 100 fair poll 500. Poll limit 1

 

      [T1 3000, N1 12016, N2 20, K 7] timer: 56608 Last polled device: none

 

      SDLLC [ma: 0000.0C01.14--, ring: 7 bridge: 1, target ring: 10

 

             largest token ring frame 2052]

 

SDLC addr C1 state is CONNECT

 

       VS 6, VR 3, RCNT 0, Remote VR 6, Current retransmit count 0

 

       Hold queue: 0/12 IFRAMEs 77/22 RNRs 0/0 SNRMs 1/0 DISCs 0/0

 

       Poll: clear, Poll count: 0, chain: p: C1 n: C1

 

       SDLLC [largest SDLC frame: 265, XID: disabled]

 

  Last input 00:00:02, output 00:00:01, output hang never

 

  Output queue 0/40, 0 drops; input queue 0/75, 0 drops

 

  Five minute input rate 517 bits/sec, 30 packets/sec

 

  Five minute output rate 672 bits/sec, 20 packets/sec

 

       357 packets input, 28382 bytes, 0 no buffer

 

       Received 0 broadcasts, 0 runts, 0 giants

 

       0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
       926 packets output, 77274 bytes, 0 underruns
       0 output errors, 0 collisions, 0 interface resets, 0 restarts
       2 carrier transitions

 

Table 26 shows the fields relevant to all SDLC connections.

Table 26 show interfaces Field Descriptions When SDLC Is Enabled 

 
Field
Description

Timers (msec)

List of timers in milliseconds.

poll pause, fair poll, Poll limit

Current values of these timers, as described in the individual commands in this chapter.

T1, N1, N2, K

Current values for these variables, as described in the individual commands in this chapter.

 

 

Table 27 shows other data given for each SDLC secondary configured to be attached to this interface.

Table 27 SDLC Field Descriptions 

 
Field
Description

addr

Address of this secondary.

State

Current state of this connection. The possible values are:

DISCONNECT—No communication is being attempted to this secondary.

CONNECT—A normal connect state exists between this router and this secondary.

DISCSENT—This router has sent a disconnect request to this secondary and is awaiting its response.

SNRMSENT—This router has sent a connect request (SNRM) to this secondary and is awaiting its response.

THEMBUSY—This secondary has told this router that it is temporarily unable to receive any more information frames.

USBUSY—This router has told this secondary that it is temporarily unable to receive any more information frames.

BOTHBUSY—Both sides have told each other that they are temporarily unable to receive any more information frames.

ERROR—This router has detected an error, and is waiting for a response from the secondary acknowledging this.

VS

Sequence number of the next information frame this station sends.

VR

Sequence number of the next information frame from this secondary that this station expects to receive.

RCNT

Number of correctly sequenced I-frames received when the Cisco IOS software was in a state in which it is acceptable to receive I-frames.

Remote VR

Last frame transmitted by this station that has been acknowledged by the other station.

Current retransmit count

Number of times the current I-frame or sequence of I-frames has been retransmitted.

Hold queue

Number of frames in hold queue/Maximum size of hold queue.

IFRAMEs, RNRs, SNRMs, DISCs

Sent/received count for these frames.

Poll

"Set" if this router has a poll outstanding to the secondary; "clear" if it does not.

Poll count

Number of polls, in a row, given to this secondary at this time.

chain

Shows the previous (p) and next (n) secondary address on this interface in the round robin loop of polled devices.

 

 

Sample Show Interfaces Accounting Display

 

The following is sample output from the show interfaces accounting command:

 

Router# show interfaces accounting

 

Interface TokenRing0 is disabled

 

Ethernet0

 

                Protocol    Pkts In   Chars In   Pkts Out  Chars Out

 

                      IP     873171  735923409      34624    9644258

 

                  Novell     163849   12361626      57143    4272468

 

                 DEC MOP          0          0          1         77

 

                     ARP      69618    4177080       1529      91740

 

Interface Serial0 is disabled

 

Ethernet1

 

                Protocol    Pkts In   Chars In   Pkts Out  Chars Out

 

                      IP          0          0         37      11845

 

                  Novell          0          0       4591     275460

 

                 DEC MOP          0          0          1         77

 

                     ARP          0          0          7        420

 

Interface Serial1 is disabled

 

Interface Ethernet2 is disabled

 

Interface Serial2 is disabled

 

Interface Ethernet3 is disabled

 

Interface Serial3 is disabled

 

Interface Ethernet4 is disabled

 

Interface Ethernet5 is disabled

 

Interface Ethernet6 is disabled

 

Interface Ethernet7 is disabled

 

Interface Ethernet8 is disabled

 

Interface Ethernet9 is disabled

 

Fddi0