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: |
|
|
• |
Current size of the input queue. |
|
• |
Maximum size of the queue. |
|
• |
Number of messages discarded in this interval. |
|
• |
Total number of messages discarded in this session. |
|
Output queue: |
|
|
• |
Current size of the output queue. |
|
• |
Congestive-discard threshold. Number of messages in the queue after which new messages for high-bandwidth conversations are dropped. |
|
• |
Number of dropped messages. |
|
• |
Number of currently active conversations. |
|
• |
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: • • • • • • • • |
|
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