Cisco IOS XR Interface and Hardware Component Command Reference for the Cisco CRS Router, Release 4.2.x - Global Interface Commands on the Cisco IOS XR Software [Cisco Carrier Routing System] - Cisco
Cisco IOS XR Interface and Hardware Component Command Reference for the Cisco CRS Router, Release 4.2.x
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Cisco IOS XR Interface and Hardware Component Command Reference for the Cisco CRS Router, Release 4.2.x
Chapter Title
Global Interface Commands on the Cisco IOS XR Software
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Chapter: Global Interface Commands on the Cisco IOS XR Software
Chapter Contents
interfaces
Global Interface Commandsonthe Cisco IOS XR Software
This module
describes the global command line interface (CLI) commands for configuring
interfaces on the
Cisco CRS Router.
To configure the
bandwidth of an interface, use the
command in interface configuration mode.
Syntax Description
bandwidth to be allocated on the interface, in Kilobits per second (kbps).
Range is from 0 through .
Command Default
The default
bandwidth depends on the interface type.
Command Modes
Interface configuration
Command History
Modification
Usage Guidelines
To obtain the
default bandwidth for a specific interface, use the
show interfaces
command after you first bring up the interface. The default interface bandwidth
is displayed in the
show interfaces
command output.
Operations
This example shows
how to configure the bandwidth on a Ten Gigabit Ethernet interface:
RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router# interface TenGigE 0/4/1/0
RP/0/RP0/CPU0:router# bandwidth 4000000
Related Commands
CommandDescription
Configures an
interface or creates or configures a virtual interface.
Disables an
interface (forces an interface to be administratively down).
To clear interface
statistics or packet counters, use the
clear interface
command in EXEC mode.
interface-path-id
Syntax Description
type. For more information, use the question mark (?) online help function.
interface-path-id
interface or virtual interface.
interfaces command to see a list of all interfaces
currently configured on the router.
information about the syntax for the router, use the question mark (?) online help function.
Command Default
No default behavior
Command Modes
Command History
Modification
Usage Guidelines
interface-path-id argument, use these guidelines:
If specifying a physical
interface, the naming notation is
rack/slot/module/port. The slash between
values is required as part of the notation. An explanation of each component of
the naming notation is as follows:
rack: Chassis number of
slot: Physical slot
number of the line card.
module: Module number. A
physical layer interface module (PLIM) is always 0.
port: Physical port
number of the interface.
If specifying a virtual
interface, the number range varies, depending on interface type.
Operations
This example shows
how to use the
interface command to clear the loopback interface 2:
RP/0/RP0/CPU0:router# clear interface loopback 2
Related Commands
CommandDescription
Configures an
interface or creates or configures a virtual interface.
Disables an
interface (forces an interface to be administratively down).
To limit propagation
of transient or frequently changing interface states on Interface Manager (IM)
clients, turn on event dampening by using the
command in interface configuration mode. To turn dampening off, use the
no form of this
[ half-life
max-suppress-time ]
] no dampening
[ half-life
max-suppress-time ]
Syntax Description
(Optional)
Time (in minutes) after which a penalty is decreased. Once the interface has
been assigned a penalty, the penalty is decreased by half after the half-life
period. The process of reducing the penalty happens every 5 seconds. The range
of the half-life period is 1 to 45 minutes. The default is 1 minute.
(Optional)
Penalty value below which a stable interface is unsuppressed. Range is from 1
through 20000. Default value is 750.
(Optional)
Limit at which an interface is suppressed when its penalty exceeds that limit.
Range is from 1 through 20000, and must be greater than the reuse threshold.
The default value is 2000.
max-suppress-time
(Optional)
Maximum time (in minutes) that an interface can be suppressed. This value
effectively acts as a ceiling that the penalty value cannot exceed. Default
value is four times the half-life period.
Command Default
Dampening is turned
off by default. When you use the
command, the following default values are enabled for any optional parameters
that you do not enter:
half-life: 1 minute
reuse: 750
suppress: 2000
max-suppress-time: Four
times the half-life
Command Modes
Interface configuration
Command History
Modification
Usage Guidelines
Event dampening
suppresses a constantly unstable interface until it remains stable for a period
of time. Enabling dampening on an interface that already has dampening
configured has the effect of resetting the penalty associated with that
interface to zero. The reuse threshold must always be less than the suppress
threshold.
Consider the
following guidelines when configuring event dampening:
Configuring dampening on both
a subinterface and its parent is usually unnecessary because their states are
almost always the same and dampening would be triggered at the same time on
each interface.
If all subinterfaces require
dampening, then apply dampening to the main interface only. Applying
configuration to large numbers of subinterfaces requires an abundance of memory
and increases the time required to process the configuration during boot and
When dampening is enabled, an
interface has a penalty value associated with it. The value starts at 0 and is
increased by 1000 whenever the underlying state of the interface changes from
up to down.
The penalty value decreases
exponentially while the interface state is stable. If the penalty value exceeds
a configured suppress threshold, then the state of the interface is suppressed
and IM will not notify upper layers of further state transitions. The
suppressed state remains until the penalty value decreases past a configured
reuse threshold.
Operations
This example shows
how to enable dampening with default values on an interface:
RP/0/RP0/CPU0:router(config)# interface TenGigE 0/4/0/0
RP/0/RP0/CPU0:router(config-if))# dampening
Related Commands
CommandDescription
Displays the
state of all interfaces on which dampening has been configured.
To configure an
interface or to create or configure a virtual interface, use the
command in global configuration mode. To delete the interface configuration,
no form of this
interface-path-idno
interface-path-id
Syntax Description
type. For more information, use the question mark (?) online help function.
interface-path-id
interface or virtual interface.
interfaces command to see a list of all interfaces
currently configured on the router.
information about the syntax for the router, use the question mark (?) online help function.
Command Default
No interfaces are
configured
Command Modes
Global configuration
Command History
Modification
Usage Guidelines
interface-path-id argument, use the following
guidelines:
If specifying a physical
interface, the naming notation is
rack/slot/module/port. The slash between
values is required as part of the notation. An explanation of each component of
the naming notation is as follows:
rack: Chassis number of
slot: Physical slot
number of the line card.
module: Module number. A
physical layer interface module (PLIM) is always 0.
port: Physical port
number of the interface.
If specifying a virtual
interface, the number range varies, depending on interface type.
command enters interface configuration mode to allow you to configure
interfaces. If a virtual interface is configured, then the interface is created
if it did not already exist.
no form of this
command applies only to virtual interfaces or to subinterfaces (that is,
interfaces that have been created in global configuration mode).
Operations
In the following
example, the
command is given for the
POS card in location
0/2/0/1, and interface configuration mode is entered for that interface:
RP/0/RP0/CPU0:router(config)# interface POS 0/2/0/1
Related Commands
CommandDescription
Clears interface
statistics or packet counters.
Disables an
interface (forces an interface to be administratively down).
To adjust the
maximum transmission unit (MTU) value for packets on the interface, use the
mtu command in
interface configuration mode. To return the interface to the default MTU for
the interface type, use the
no form of this
Syntax Description
number of bytes in a Layer 2 frame. Range is from 64 through 65535.
Command Default
The default MTU for
each interface is as follows:
Ethernet—1514 bytes
POS—4474 bytes
Tunnel—1500 bytes
Loopback—1514 bytes
ATM—4470 bytes
Command Modes
Interface configuration
Command History
Modification
Usage Guidelines
mtu command to
set a specific MTU value for an interface, or use the
no mtu command
to return the interface to the default MTU value for that interface type. The
MTU value can be increased or decreased using the
mtu command,
subject to minimum and maximum MTU limits for the interface type.
If the MTU value is
not configured, then each interface will have a default MTU value that is
specific to the interface type. The default MTU value is generally the largest
Layer 2 frame size possible for the interface type.
default/configured MTU value on an atm interface includes the L2 header.
The MTU size
consists of L2 header that includes either SNAP(8bytes)/MUX(0)/NLPID(2) header
or the AAL5 SDU. The AAL5 SDU includes the L3 datagram and the optional Logical
Link Control/Subnetwork Access Protocol (LLC/SNAP) header.
The Ethernet
interface is the Layer 3 datagram plus 14 bytes. For ATM main interface, the
MTU is L3 datagram + 0 bytes.
For ATM L3 sub
interface, mtu is as follows:
SNAP - L3 datagram + 8
NLPID - L3 datagram + 2
MUX - L3datagram + 0 bytes
When no pvc is configured
under sub interface - L3datagram + 0 bytes
All serial links
in a Multilink Point-to-Point Protocol (MLPPP) bundle or a Multilink Frame
Relay (MFR) bundle inherit the default MTU value from the multilink bundle. If
a serial interface has a nondefault MTU value, the Cisco IOS XR software blocks
that serial interface from being added to an MLPPP or MFR bundle. Therefore,
you must not configure the MTU value on a serial interface until you have added
that serial interface to an MLPPP or MFR bundle.
You can use the
show interfaces
command to determine if the MTU value has been changed. The
show interfaces
command output displays the MTU size for each interface in the MTU (byte)
You can use the
show interfaces
command to determine if the MTU value has been changed. The
show interfaces
command output displays the MTU size for each interface in the MTU (byte)
field. Note that the MTU size that is displayed includes the Layer 2 header
bytes used for each encapsulation type.
Changing the MTU
on an interface triggers a change on the protocols and capsulations configured
on that interface, although some protocol-specific configurations can override
the interface MTU. For example, specifically changing the interface MTU
configuration does not affect the IP MTU configuration, but may affect the
resulting MTU on that node.
Operations
In the following
example, the MTU value for all interfaces is verified. The MTU value is shown
in the next-to-last column:
RP/0/RP0/CPU0:router# show interfaces all brief
Type (byte)
--------------------------------------------------------------------------------
TenGigE6/0/0/0
TenGigE6/0/0/1
TenGigE6/0/0/2
admin-down
admin-down
TenGigE6/0/0/3
admin-down
admin-down
Mg0/RP0/CPU0/0
RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# interface TenGigE 6/0/0/0
RP/0/RP0/CPU0:router(config-if)# mtu 1000
mtu command
is used to decrease the MTU Layer 2 frame size for the POS interface on 6/0/0/0
to 1000 bytes, the
show interfaces all
brief command is used again to verify that the MTU Layer 2 frame
size has been changed:
RP/0/RP0/CPU0:router# show interfaces all brief
Type (byte)
--------------------------------------------------------------------------------
admin-down
admin-down
admin-down
admin-down
Mg0/RP0/CPU0/0
Related Commands
CommandDescription
Disables an
interface (forces an interface to be administratively down).
To display the state
of all interfaces on which dampening has been configured, use the
dampening command in EXEC mode.
| ifhandle
Syntax Description
(Optional)
Interface type. For more information, use the question mark (?) online help function.
(Optional)
Identifies the caps node whose Interface Manager (IM) dampening information you
want to display.
Command Default
If you do not
specify an interface, then the system displays brief details about all dampened
interfaces.
Command Modes
Command History
Modification
Usage Guidelines
If you do not
specify an interface, then the system displays brief details about all dampened
interfaces.
The physical
hardware (layer 1) is not the only part of an interface that can change state.
L2 keepalive failure event is one of the many instances that can have a similar
impact on routing protocols despite the underlying interface state staying UP.
To take account of such events, when dampening is configured on an interface,
it is applied independently to every layer. They all use the same parameters as
the interface but they have their own penalty value which is incremented when
that layer changes state.
Capsulations that
may be dampened in this way include these:
L2 basecaps,
such as HDLC and PPP, which may flap if keepalives are not received due to
events such as intermittent packet loss.
capsulations (for example ipv4, ipv6). These may be brought down if another
link has a conflicting IP address configured.
locations where negotiation takes place with a peer router, as in the case of
PPP control protocols such as IPCP. If the negotiation fails, then the caps is
brought down.
Operations
This example shows
the output from the
dampening command issued with default values:
RP/0/RP0/CPU0:router(config)# interface TenGigE 0/4/0/0
RP/0/RP0/CPU0:router(config-if)# no shutdown
RP/0/RP0/CPU0:router(config-if)# dampening
RP/0/RP0/CPU0:router# show im dampening
Penalty Suppressed
----------------
TenGigE0/4/0/0
RP/0/RP0/CPU0:router# show im dampening interface TenGigE 0/4/0/0
TenGigE0/4/0/0 (0x05000d00)
Dampening enabled: penalty 0, not suppressed
underlying state: Up
half_life: 1
max-suppress-time: 4
restart-penalty:
RP/0/RP0/CPU0:router# show interfaces TenGigE 0/4/0/0
TenGigE0/4/0/0 is up, line protocol is down
Dampening enabled: penalty 0, not suppressed
half_life: 1
max-suppress-time: 4
restart-penalty:
Hardware is Ten Gigabit Ethernet
Description: ensoft-gsr5 TenGigE 4\2
Internet address is Unknown
MTU 4474 bytes, BW 155520 Kbit
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, controller loopback not set, keepalive set (10 sec)
Last clearing of "show interface" counters never
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 total input drops
0 drops for unrecognized upper-level protocol
Received 0 broadcast packets, 0 multicast packets
0 runts, 0 giants, 0 throttles, 0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
48 packets output, 1504 bytes, 0 total output drops
Output 0 broadcast packets, 0 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
This sample output
shows a POS interface with PPP basecaps and IPCP. The
subsequent
output for
show im dampening interface
&ifname& contains a table of any capsulations which have
their own penalty as shown below:
RP/0/RP0/CPU0:router# show im dampening
Capsulation
--------------------------- ------------------ -------------------- ----- ---
GigabitEthernet0/0/0/0
GigabitEthernet0/0/0/1
POS0/2/0/0
POS0/2/0/0
POS0/2/0/0
RP/0/RP0/CPU0:router# show im dampening interface TenGigaE 0/1/0/0
TenGigE 0/1/0/0 (0x)
Dampening enabled: Penalty 1625, SUPPRESSED (42 secs remaining)
Underlying state: Down
half-life: 1
max-suppress-time: 4
restart-penalty:
Capsulation
Suppression
-------------- ------------------ ----- --------------------- -------------
When dampening
is configured on an interface it is also applied independently to all
capsulations on that interface. For example, the ppp or hdlc basecaps state can
flap even while the interface stays up and if keepalives fail. The
show im dampening
interface command contains one line for each such capsulation as
well as the interface itself.
Table 1 show im
dampening Field Descriptions
Description
Related Commands
CommandDescription
Turns on event
dampening.
Disables an
interface (forces an interface to be administratively down).
interfaces
To display
statistics for all interfaces configured on the router or for a specific node,
show interfaces
command in EXEC mode.
interfaces
interface-path-id
| all | local | location
[ accounting | brief | description | detail | summary ]
Syntax Description
(Optional)
Specifies the type of interface for which you want to display statistics. For
more information, use the question mark (?) online help function.
interface-path-id
interface or virtual interface.
interfaces command to see a list of all interfaces
currently configured on the router.
information about the syntax for the router, use the question mark (?) online help function.
(Optional)
Displays interface information for all interfaces
.This is the default.
(Optional)
Displays interface information for all interfaces in the local card.
(Optional)
Displays information about all interfaces on the specified node. The
argument is entered in the
rack/slot/module notation.
accounting
(Optional)
Displays the number of packets of each protocol type that have been sent
through the interface.
(Optional)
Displays brief information of each interface (one line per interface).
description
(Optional)
Displays the status, protocol, and description of each interface (one line per
interface).
(Optional)
Displays detailed information about each interface. This is the default.
(Optional)
Displays a summary of interface information by interface type.
Command Default
No default behavior
Command Modes
Command History
Modification
Usage Guidelines
interface-path-id argument, use the following
guidelines:
If specifying a physical
interface, the naming notation is
rack/slot/module/port. The slash between
values is required as part of the notation. An explanation of each component of
the naming notation is as follows:
rack: Chassis number of the rack.
slot: Physical slot number of the line card.
module: Module number. A physical layer interface
module (PLIM) is always 0.
port: Physical port number of the interface.
If specifying a virtual
interface, the number range varies, depending on interface type.
interfaces command displays statistics for the network
interfaces. The resulting display shows the interface processors in slot order.
For example, if
you type the
interfaces command without an interface type, you receive
information for all the interfaces installed in the networking device. Only by
specifying the interface
arguments can you display information for a particular interface.
If you enter a
interfaces command for an interface type that has been removed
from the networking device, an error message is displayed: “Interface not
The output
displayed depends on the network for which an interface has been configured.
Beginning in Cisco IOS XR
Release 3.8.4, when you shut down a bundle interface, the member links are put
into err-disable link interface status and admin-down line protocol state.
The 5-minute
input and output rates should be used only as an approximation of traffic per
second during a given 5-minute period. These rates are exponentially weighted
averages with a time constant of 5 minutes. A period of four time constants
must pass before the average is within 2 percent of the instantaneous rate of a
uniform stream of traffic over that period.
Operations
The following
example shows the output from the
interfaces command. The output displayed depends on the type and
number of interface cards in the networking device.
RP/0/RP0/CPU0:router# show interfaces tenGigE 0/0/0/1
TenGigE0/0/0/1 is administratively down, line protocol is administratively down
Hardware is TenGigE, address is .d909 (bia .d909)
Description: user defined string
Internet address is Unknown
MTU 1514 bytes, BW
reliability 255/255, txload 0/255, rxload 0/255
Encapsulation ARPA,
Full-duplex, 10000Mb/s, LR
output flow control is off, input flow control is off
loopback not set
ARP type ARPA, ARP timeout 01:00:00
Last clearing of "show interface" counters never
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 total input drops
0 drops for unrecognized upper-level protocol
Received 0 broadcast packets, 0 multicast packets
0 runts, 0 giants, 0 throttles, 0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 total output drops
Output 0 broadcast packets, 0 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
In the following sample
output, instance 1 is specified on a Packet-over-SONET/SDH (POS) card:
RP/0/RP0/CPU0:router# show interfaces POS 0/1/0/1
POS0/1/0/1 is administratively down, line protocol is administratively down
Hardware is Packet over SONET
Internet address is n.n.n.n/n
MTU 4474 bytes, BW 9953280 Kbit
reliability 255/255, txload 0/255, rxload 0/255
Encapsulation HDLC, crc 32, controller loopback not set, keepalive not set
Last clearing of "show interface" counters never
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 total input drops
0 drops for unrecognized upper-level protocol
Received 0 broadcast packets, 0 multicast packets
0 runts, 0 giants, 0 throttles, 0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 total output drops
Output 0 broadcast packets, 0 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
The following example shows
sample output for ATM subinterface 0/4/2/0/1.1:
RP/0/RP0/CPU0:router# show interfaces ATM0/4/2/0/1.1
ATM0/4/2/0/1.1 is up, line protocol is up
Interface state transitions: 1
Hardware is ATM network sub-interface(s)
Description: Connected to PE22_C12406 ATM 0/4/0/0/1.1
Internet address is 10.212.4.21/24
MTU 4486 bytes, BW 1544 Kbit
reliability Unknown, txload Unknown, rxload Unknown
Encapsulation AAL5/SNAP, controller loopback not set,
Last clearing of "show interface" counters Unknown
Datarate information unavailable.
Interface counters unavailable.
show interfaces atm
interface-path-id command does not display data
rates and counters for an ATM subinterface. Alternatively, you can use the
show interfaces atm
interface-path-id
accounting command to view packet and character
counters for each protocol, and the
show atm pvc
vpi/vci command to view cell, packet, and byte
The following
example shows bundle member links whose link interface status is “err-disable”
and line protocol state is “admin-down” after the bundle interface has been
administratively shut down using the
RP/0/RP0/CPU0:router# show interfaces brief
6 06:30:55.797 DST
Type (byte)
--------------------------------------------------------------------------------
admin-down
admin-down
802.1Q VLAN
802.1Q VLAN
802.1Q VLAN
802.1Q VLAN
Mg0/RP0/CPU0/0
Mg0/RP0/CPU0/1
admin-down
admin-down
admin-down
admin-down
admin-down
admin-down
Gi0/1/0/3.160
802.1Q VLAN
Gi0/1/0/3.161
802.1Q VLAN
Gi0/1/0/3.185
802.1Q VLAN
Gi0/1/0/3.189
802.1Q VLAN
Gi0/1/0/3.215
802.1Q VLAN
admin-down
admin-down
admin-down
admin-down
admin-down
admin-down
Gi0/1/0/7.185
802.1Q VLAN
Gi0/1/0/7.187
802.1Q VLAN
Gi0/1/0/7.189
802.1Q VLAN
Gi0/1/0/7.210
802.1Q VLAN
Gi0/1/0/7.211
802.1Q VLAN
Gi0/1/0/7.215
802.1Q VLAN
admin-down
admin-down
Gi0/1/0/10
admin-down
admin-down
Gi0/1/0/11
admin-down
admin-down
Gi0/1/0/12
Gi0/1/0/13
admin-down
admin-down
Gi0/1/0/14
admin-down
admin-down
Gi0/1/0/15
admin-down
admin-down
Gi0/1/0/16
Gi0/1/0/17
Gi0/1/0/18
Gi0/1/0/19
Gi0/1/0/19.2127
802.1Q VLAN
Gi0/1/0/19.2130
802.1Q VLAN
Gi0/1/0/20
Gi0/1/0/20.2125
802.1Q VLAN
Gi0/1/0/21
admin-down
admin-down
Gi0/1/0/22
admin-down
admin-down
Gi0/1/0/23
Gi0/1/0/24
admin-down
admin-down
Gi0/1/0/25
admin-down
admin-down
Gi0/1/0/26
admin-down
admin-down
Gi0/1/0/27
Gi0/1/0/28
admin-down
admin-down
Gi0/1/0/29
admin-down
admin-down
Gi0/1/0/30
Gi0/1/0/30.215
802.1Q VLAN
Gi0/1/0/31
Gi0/1/0/32
admin-down
admin-down
Gi0/1/0/33
admin-down
admin-down
Gi0/1/0/34
admin-down
admin-down
Gi0/1/0/35
admin-down
admin-down
Gi0/1/0/36
admin-down
admin-down
Gi0/1/0/37
admin-down
admin-down
Gi0/1/0/38
admin-down
admin-down
Gi0/1/0/39
admin-down
admin-down
err-disable admin-down
err-disable admin-down
err-disable admin-down
err-disable admin-down
err-disable admin-down
err-disable admin-down
err-disable admin-down
err-disable admin-down
admin-down
admin-down
admin-down
admin-down
admin-down
admin-down
admin-down
admin-down
Table 2 show
interfaces Field Descriptions
Description
protocol state is not the same as the protocol state displayed in the
interfaces command, because it is the state of Layer 2 (media)
rather than Layer 3 (IP protocol).
mac-address
command to configure the hardware address.
is not configurable.
description
command to configure the description associated with the interface.
ipv4 address
command to configure the internet address for the interface.
field indicates the interface MTU. Enter the
mtu command
to configure a lower MTU value at the Layer 3 level.
reliability is shown as a fraction of 255.
txload is shown as a fraction of 255.
rxload is shown as a fraction of 255.
is not present for all interface types.
command to configure the CRC.
command to configure the loopback or controller loopback.
keepalive command to configure the value of the keepalive
field may not be present if it is not applicable to the interface type.
field is present only for shared media.
interface types, you can configure the duplexity by entering the
full-duplex
half-duplex
5-minute period referenced in the command output is a load interval that is
configurable under the interface. The default value is 5 minutes.
5-minute input should be used only as an approximation of traffic per second
during a given 5-minute period. This rate is exponentially weighted average
with a time constant of 5 minutes. A period of four time constants must pass
before the average is within two percent of the instantaneous rate of a uniform
stream of traffic over that period.
5-minute period referenced in the command output is a load interval that is
configurable under the interface. The default value is 5 minutes.
5-minute output should be used only as an approximation of traffic per second
during a given 5-minute period. This rate is exponentially weighted average
with a time constant of 5 minutes. A period of four time constants must pass
before the average is within two percent of the instantaneous rate of a uniform
stream of traffic over that period.
Related Commands
Description
To disable an
interface (to force an interface to be administratively down), use the
command in interface configuration mode. To enable an interface that has been
shut down, use the
no form of this
shutdownno
Syntax Description
This command has no keywords or arguments.
Command Default
The interface is
enabled by default and is disabled only when shutdown is configured.
When you add an
interface to the system, or when all the configuration for an interface is lost
or deleted, the interface is put in the shutdown state by the system adding the
interface.
Command Modes
Interface configuration
Command History
Modification
Usage Guidelines
command to move the state of an interface to administratively down, which stops
traffic flowing through the interface. This state does not stop other action
from happening on the interface such as changes in configuration, protocols,
capsulations, and so forth.
command also marks the interface as unavailable. To check whether the state of
an interface is down, use the
show interfaces
command in EXEC mode, which displays the current state of the interface. An
interface that has been shut down is shown as administratively down in the
display from the
show interfaces
Operations
In this example,
TenGigE interface 0/4/0/2 is turned off:
RP/0/RP0/CPU0:router(config)# interface TenGigE 0/4/0/2
RP/0/RP0/CPU0:router(config-if)# shutdown
Related Commands
Description
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