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| Title | Size | Download |
|---|---|---|
| 04-WAN interface commands | 193.72 KB |
WAN interface commands
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IMPORTANT: To configure WAN interfaces, make sure the corresponding WAN interfaces are supported. For information about WAN interfaces supported, see the installation guide and interface module manual. |
Common WAN interface commands
default
Use default to restore the default settings for an interface.
Syntax
default
Views
CE1 interface view
Serial interface view
Predefined user roles
network-admin
Usage guidelines
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CAUTION: The default command might interrupt ongoing network services. Make sure you are fully aware of the impact of this command when you use it on a live network. |
This command might fail to restore the default settings for some commands for reasons such as command dependencies and system restrictions. You can use the display this command in interface view to check for these commands, and use their undo forms or follow the command reference to restore their respective default settings. If your restoration attempt still fails, follow the error message instructions to resolve the problem.
Examples
# Restore the default settings of Serial 2/1/0.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] default
description
Use description to configure the description of an interface.
Use undo description to restore the default.
Syntax
description text
undo description
Default
The interface description uses the interface name Interface format, for example, Serial2/1/0 Interface.
Views
CE1 interface view
Serial interface view
Predefined user roles
network-admin
Parameters
text: Specifies the description, a case-sensitive string of 1 to 255 characters.
Examples
# Configure the description of Serial 2/1/0 as router-interface.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] description router-interface
shutdown
Use shutdown to shut down an interface.
Use undo shutdown to restore the default.
Syntax
shutdown
undo shutdown
Default
A WAN interface is up.
Views
CE1 interface view
Serial interface view
Predefined user roles
network-admin
Examples
# Shut down Serial 2/1/0.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] shutdown
Serial interface commands
bandwidth
Use bandwidth to set the expected bandwidth of an interface.
Use undo bandwidth to restore the default.
Syntax
bandwidth bandwidth-value
undo bandwidth
Default
The expected bandwidth (in kbps) is the interface baud rate divided by 1000.
Views
Serial interface view
Predefined user roles
network-admin
Parameters
bandwidth-value: Specifies the expected bandwidth in the range of 1 to 400000000 kbps.
Usage guidelines
The expected bandwidth is an informational parameter used only by higher-layer protocols for calculation. You cannot adjust the actual bandwidth of an interface by using this command.
Examples
# Set the expected bandwidth of Serial 1/2/0/1:0 to 50 kbps.
<Sysname> system-view
[Sysname] interface serial 1/2/0/1:0
[Sysname-Serial1/2/0/1:0] bandwidth 50
crc
Use crc to set the CRC mode for a synchronous serial interface.
Use undo crc to restore the default.
Syntax
crc { 16 | 32 | none }
undo crc
Default
16-bit CRC is used.
Views
Synchronous serial interface view
Predefined user roles
network-admin
Parameters
16: Specifies 16-bit CRC.
32: Specifies 32-bit CRC.
none: Disables CRC.
Examples
# Configure Serial 2/1/0 to use 32-bit CRC.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] crc 32
display interface serial
Use display interface serial to display information about serial interfaces.
Syntax
display interface serial [ interface-number ] [ brief [ description | down ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
serial [ interface-number ]: Specifies a serial interface by its number. If you do not specify the serial keyword, this command displays information about all interfaces. If you specify the serial keyword without specifying an interface, this command displays information about all serial interfaces.
brief: Displays brief interface information. If you do not specify this keyword, the command displays detailed interface information.
description: Displays complete interface descriptions. If you do not specify this keyword, the command displays only the first 25 characters of interface descriptions.
down: Displays physically down interfaces and their down causes. If you do not specify this keyword, the command displays information about interfaces in all states.
Examples
# Display detailed information about Serial 2/1/0.
<Sysname> display interface serial 2/1/0
Serial2/1/0
Current state: DOWN
Line protocol state: DOWN
Description: Serial2/1/0 Interface
Bandwidth: 200000 kbps
Maximum transmission unit: 128
Hold timer: 10 seconds, retry times: 10
Derived from E1 1/1/0, Timeslot(s) Used: 1, Baudrate is 64000 bps
Internet address: 9.9.9.6/24 (Primary)
Link layer protocol: PPP
LCP: opened
Output queue - Urgent queuing: Size/Length/Discards 0/1024/0
Output queue - Protocol queuing: Size/Length/Discards 0/500/0
Output queue - FIFO queuing: Size/Length/Discards 0/75/0
Last clearing of counters: Never
Last 300 seconds input rate 0.00 bytes/sec, 0 bits/sec, 0.00 packets/sec
Last 300 seconds output rate 0.00 bytes/sec, 0 bits/sec, 0.00 packets/sec
Input: 0 packets, 0 bytes, 0 no buffers
8589934590 errors, 0 runts, 0 giants
0 CRC, 4294967295 align errors, 0 overruns
0 dribbles, 0 aborts
Output:0 packets, 0 bytes
0 errors, 0 underruns, 0 aborts
# Display brief information about Serial 2/1/0.
<Sysname> display interface serial 2/1/0 brief
Brief information on interfaces in route mode:
Link: ADM - administratively down; Stby - standby
Protocol: (s) - spoofing
Interface Link Protocol Primary IP Description
Ser2/1/0 DOWN DOWN 9.9.9.6
# Display brief information about all serial interfaces in down state and the causes.
<Sysname> display interface serial brief down
Brief information on interfaces in route mode:
Link: ADM - administratively down; Stby - standby
Interface Link Cause
Ser2/1/0 ADM Administratively
Table 1 Command output
|
Field |
Description |
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Current state |
Physical link state of the interface: · Administratively DOWN—The interface has been shut down by using the shutdown command. · DOWN—The interface is administratively up, but its physical state is down (possibly because no physical link exists or the link has failed). · UP—The interface is both administratively and physically up. |
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Line protocol state |
Data link layer state of the interface. The state is determined through automatic parameter negotiation at the data link layer. · UP—The data link layer protocol is up. · DOWN—The data link layer protocol is down. |
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Description |
Description of the interface. |
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Bandwidth |
Expected bandwidth of the interface. |
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Maximum transmission unit |
MTU of the interface. |
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Hold timer |
Interval at which the interface sends keepalive packets. |
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retry times |
Maximum number of keepalive attempts. The interface determines that the remote end is down if it does not receive a keepalive response after the maximum number of keepalive attempts have been made. |
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Internet protocol processing: Disabled |
The interface is not assigned an IP address and cannot process IP packets. |
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Internet Address |
IP address of the interface. The primary attribute indicates that the address is the primary IP address. |
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Link layer protocol |
Link layer protocol of the interface. |
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LCP: opened |
A PPP connection is established successfully. |
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Output queue - Urgent queuing: Size/Length/Discards Output queue - Protocol queuing: Size/Length/Discards Output queue - FIFO queuing: Size/Length/Discards |
Information about the urgent, protocol, and FIFO output queues: · Size—Number of packets in the queue. · Length—Maximum number of packets that the queue can contain. · Discards—Number of dropped packets. |
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Last link flapping |
The amount of time that has elapsed since the most recent physical state change of the interface. This field displays Never if the interface has been physically down since device startup. |
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Last clearing of counters |
The most recent time that the reset counters interface serial command was executed. This field displays Never if this command has not been executed since the device startup. |
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Physical layer |
Physical layer information. |
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Baudrate |
Baud rate of the interface. |
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Interface: DCE Cable type: V35 Clock mode: DCECLK1 |
Synchronizes the clock mode on the DCE side of the interface. |
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Last 300 seconds input rate 2.40 bytes/sec, 19 bits/sec, 0.20 packets/sec |
Average input rates (in Bps, bps, and pps) for the last 300 seconds. |
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Last 300 seconds output rate 2.40 bytes/sec, 19 bits/sec, 0.20 packets/sec |
Average output rates (in Bps, bps, and pps) for the last 300 seconds. |
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Input: 6668 packets, 80414 bytes 0 broadcasts, 0 multicasts 0 errors, 0 runts, 0 giants 0 crc, 0 align errors, 0 overruns 0 aborts, 0 no buffers |
Incoming traffic statistics for the interface: · broadcasts—Number of incoming broadcast packets. · multicasts—Number of incoming multicast packets. · errors—Number of error packets detected at the physical layer. · runts—Number of incoming undersized packets. · giants—Number of incoming oversized packets. · crc—Number of incoming normal-size packets with CRC errors. · align errors—Number of incoming packets with alignment errors. · overruns—Number of packet drops because the input rate of the interface exceeded the queuing capability. · aborts—Number of anomalous errors. · no buffers—Number of packet drops because the receive buffer is full. |
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Output: 6670 packets, 80446 bytes 0 errors, 0 underruns, 0 collisions 0 deferred |
Outgoing traffic statistics for the interface: · errors—Number of error packets detected at the physical layer. · underruns—Number of packets that fail to be forwarded because the interface reads from memory slower than it forwards packets. · collisions—Number of packets that the interface stopped transmitting because packet collisions were detected during transmission. · deferred—Number of packets that the interface deferred to transmit because of detected collisions or timeout events. |
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Brief information on interfaces in route mode: |
Brief information about Layer 3 interfaces. |
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Interface |
Abbreviated interface name. |
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Link |
Physical link state of the interface: · UP—The interface is physically up. · DOWN—The interface is physically down. · ADM—The interface has been shut down by using the shutdown command. To restore the physical state of the interface, use the undo shutdown command. · Stby—The interface is a backup interface in standby state. To see the primary interface, use the display interface-backup state command. |
|
Protocol |
Data link layer protocol state of the interface: · UP—The data link layer protocol of the interface is up. · DOWN—The data link layer protocol of the interface is down. · UP(s)—The data link layer protocol of the interface is up, but the link is an on-demand link or does not exist. The (s) attribute represents the spoofing flag. |
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Primary IP |
Primary IP address of the interface. This field displays two hyphens (--) if the interface does not have an IP address. |
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Description |
Description of the interface. |
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Cause |
Cause for the physical link state of an interface to be DOWN: · Administratively—The interface has been manually shut down by using the shutdown command. To restore the physical state of the interface, use the undo shutdown command. · Not connected—No physical connection exists (possibly because the network cable is disconnected or faulty). |
Related commands
reset counters interface serial
interface serial
Use interface serial to enter serial interface view.
Syntax
interface serial interface-number
Views
System view
Predefined user roles
network-admin
Parameters
interface-number: Specifies a serial interface by its number.
Examples
# Enter the view of Serial 1/2/0/1:0.
<Sysname> system-view
[Sysname] interface serial 1/2/0/1:0
[Sysname-Serial1/2/0/1:0]
Related commands
link-protocol
link-protocol
Use link-protocol to configure the data link layer protocol for an interface.
Syntax
link-protocol { hdlc | ppp }
undo link-protocol
Default
A synchronous serial interface uses PPP as the data link layer protocol.
Views
Synchronous serial interface view
Predefined user roles
network-admin
Parameters
hdlc: Specifies the HDLC data link layer protocol.
ppp: Specifies the PPP data link layer protocol.
Examples
# Specify HDLC as the data link layer protocol of Serial 2/1/0.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] link-protocol hdlc
loopback-test
Use loopback-test to initiate a loopback test on a synchronous serial interface.
Syntax
loopback-test [ -c count | -p { pattern | special { ascending | descending | random } } | -s packetsize | -t timeout ] * interface interface-type interface-number
Default
No loopback test is performed on a synchronous serial interface.
Views
Any view
Predefined user roles
network-admin
Parameters
-c count: Specifies the number of test packets to be sent. The value range is 1 to 4294967295, and the default is 5.
-p: Specifies how the packet payload will be filled.
· pattern: Fills the payload with a fixed pattern. The value is a hexadecimal number in the range of 0 to ffffffff. For example, if this argument is specified as ff, the payload is filled with repeated strings of ff. By default, the test packet payload is filled with alternating hexadecimal numbers 55 and aa.
· special: Fills the payload with a dynamic hexadecimal number pattern.
¡ ascending: Fills the payload with hexadecimal numbers 00 to ff in ascending order.
¡ descending: Fills the payload with hexadecimal numbers ff to 00 in descending order.
¡ random: Fills the payload with random hexadecimal numbers in the range of 00 to ff.
-s packetsize: Specifies the test packet size in bytes, excluding the 8-byte packet header. The value range is 0 to 1688, and the default is 52.
-t timeout: Specifies the amount of time the local end waits for a response from the remote end. The value range is 0 to 5000 milliseconds, and the default is 2000 milliseconds. Increase the time value on a slow link.
interface interface-type interface-number: Specifies an interface by its type and number.
Usage guidelines
This command is available only on synchronous serial interfaces that are created for CE1 interfaces.
Use this command to test whether the remote end is enabled with loopback. In the loopback test, the interface sends the specified number of test packets to the remote end. If the remote end is enabled with loopback, the test packets can be looped back to the interface.
The quality of the path between the interface and the remote end can be measured based on the loopback test statistics. For more information about the loopback test statistics, see Table 2.
Examples
# Perform a loopback test on Serial 2/1/0.
<Sysname> loopback-test interface serial 2/1/0
Loopback test on Serial2/1/0: 52 data bytes, Press CTRL_C to break
Received from Serial2/1/0: bytes=52 sequence=1 time=1 ms
Received from Serial2/1/0: bytes=52 sequence=2 time=1 ms
Received from Serial2/1/0: bytes=52 sequence=3 time=1 ms
Received from Serial2/1/0: bytes=52 sequence=4 time=1 ms
Received from Serial2/1/0: bytes=52 sequence=5 time=1 ms
--- Serial2/1/0 loopback test statistics ---
5 packet(s) transmitted
5 packet(s) received
0 packet(s) lost
0 packet(s) error
0.00% packet loss
0.00% packet error
Round-trip min/avg/max = 1/1/1 ms
Test result: Loopback is enabled on the remote end.
|
Field |
Description |
|
Loopback test on Serial2/1/0: 52 data bytes, press CTRL_C to break |
Test whether loopback is enabled on the remote end of Serial 2/1/0. The payload in each test packet is 52 bytes. Press Ctrl+C to abort the test. |
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Received from Serial2/1/0: bytes=52 sequence=1 time=1 ms |
Statistics for the response packets received on Serial 2/1/0: · bytes—Number of bytes in the payload of the response packet. · sequence—Sequence number of the response packet, which is used to determine whether a packet is lost, disordered, or repeated. · time—Round-trip time. If no response packets were received within the timeout time, Wait time out is displayed. |
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--- Serial2/1/0 loopback test statistics --- |
Statistics on data received and transmitted in the loopback test. |
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5 packet(s) transmitted |
Number of test packets sent. |
|
5 packet(s) received |
Number of response packets received. |
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0 packet(s) lost |
Number of test packets for which no responses were received. |
|
0 packet(s) error |
Number of error packets received. |
|
0.00% packet loss |
Packet loss ratio. |
|
0.00% packet error |
Packet error ratio. |
|
Round-trip min/avg/max = 1/1/1 ms |
Minimum/average/maximum round-trip time in milliseconds. |
|
Test result |
Test result: · Loopback is enabled on the remote end. · Loopback is not enabled on the remote end. · Loopback might be enabled on the remote end. |
mtu
Use mtu to set the MTU for an interface.
Use undo mtu to restore the default.
Syntax
mtu size
undo mtu
Default
The MTU of an interface is 1500 bytes.
Views
Serial interface view
Predefined user roles
network-admin
Parameters
size: Sets the MTU in bytes in the range of 128 to 1500.
Usage guidelines
The MTU of an interface affects the fragmentation and assembly of IP packets on the interface.
For the mtu command to take effect on an interface, execute the shutdown command and then the undo shutdown command on the interface after executing the mtu command.
Examples
# Set the MTU to 1430 bytes for Serial 1/2/0/1:0.
<Sysname> system-view
[Sysname] interface serial 1/2/0/1:0
[Sysname-Serial1/2/0/1:0] mtu 1430
reset counters interface serial
Use reset counters interface serial to clear serial interface statistics.
Syntax
reset counters interface serial [ interface-number ]
Views
User view
Predefined user roles
network-admin
Parameters
serial [ interface-number ]: Specifies a serial interface by its number. If you do not specify the serial keyword, this command clears statistics for all interfaces. If you specify the serial keyword without specifying an interface, this command clears statistics for all serial interfaces.
Usage guidelines
Use this command to clear history statistics before you collect traffic statistics for a time period.
Examples
# Clear statistics for Serial 2/1/0.
<Sysname> reset counters interface serial 2/1/0
Related commands
display interface serial
timer-hold
Use timer-hold to set the keepalive interval.
Use undo timer-hold to restore the default.
Syntax
timer-hold seconds
undo timer-hold
Default
The keepalive interval is 10 seconds.
Views
Serial interface view
Predefined user roles
network-admin
Parameters
seconds: Specifies the interval at which an interface sends keepalive packets. The value range is 0 to 32767 seconds.
Usage guidelines
On an interface encapsulated with PPP or HDLC, the data link layer sends keepalive packets at keepalive intervals to detect the availability of the remote end. The data link layer determines that the peer end is down if it does not receive a response after the maximum number of keepalive attempts have been made. The data link layer then reports the link down event to the upper-layer protocols.
To set the maximum number of keepalive attempts, use the timer-hold retry command.
On a slow link, increase the keepalive interval to prevent false shutdown of the interface. This situation might occur when keepalive packets are delayed because a large packet is being transmitted on the link.
Examples
# Set the keepalive interval to 15 seconds for Serial 1/2/0/1:0.
<Sysname> system-view
[Sysname] interface serial 1/2/0/1:0
[Sysname-Serial1/2/0/1:0] timer-hold 15
Related commands
timer-hold retry
timer-hold retry
Use timer-hold retry to set the maximum number of keepalive attempts.
Use undo timer-hold retry to restore the default.
Syntax
timer-hold retry retries
undo timer-hold retry
Default
The maximum number of keepalive attempts is 5.
Views
Serial interface view
Predefined user roles
network-admin
Parameters
retries: Specifies the maximum number of keepalive attempts, in the range of 1 to 255.
Usage guidelines
The interface determines that the remote end is down if it does not receive a response after the maximum number of keepalive attempts have been made.
This command applies to interfaces encapsulated with PPP or HDLC. To set the keepalive interval, use the timer-hold command.
On a slow link, increase the maximum number of keepalive attempts to prevent false shutdown of the interface. This situation might occur when keepalive packets are delayed because a large packet is being transmitted on the link.
Examples
# Set the maximum number of keepalive attempts to 10 for Serial 1/2/0/1:0.
<Sysname> system-view
[Sysname] interface serial 1/2/0/1:0
[Sysname-Serial1/2/0/1:0] timer-hold retry 10
Related commands
timer-hold
Basic CE1 interface commands
alarm-detect
Use alarm-detect to enable RAI detection on an interface.
Use undo alarm-detect to disable RAI detection on an interface.
Syntax
alarm-detect rai
undo alarm-detect rai
Default
RAI detection is enabled on an interface.
Views
CE1 interface view
Predefined user roles
network-admin
Parameters
rai: Remote Alarm Indication (RAI).
Usage guidelines
This command is applicable when the interface operates in CE1 mode.
Examples
# Enable RAI detection on E1 1/1/0.
<Sysname> system-view
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] alarm-detect rai
cable (CE1 interface)
Use cable to set the cable type for a CE1 interface.
Use undo cable to restore the default.
Syntax
cable { long | short }
undo cable
Default
The long keyword applies.
Views
CE1 interface view
Predefined user roles
network-admin
Parameters
long: Specifies the attenuation of the receiver as –43 dB.
short: Specifies the attenuation of the receiver as –10 dB.
Examples
# Set the cable length matching E1 1/1/0 to short.
<Sysname> system-view
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] cable short
channel-set (CE1 interface)
Use channel-set to bundle timeslots on a CE1 interface into a channel set.
Use undo channel-set to cancel the bundling.
Syntax
channel-set set-number timeslot-list list
undo channel-set [ set-number ]
Default
No channel sets exist on an interface.
Views
CE1 interface view
Predefined user roles
network-admin
Parameters
set-number: Specifies the number of the channel set for the timeslot bundle. The value range is 0 to 30.
timeslot-list list: Specifies a comma-separated list of timeslot items. An item can be an individual timeslot or a timeslot range. Use a hyphen (-) to separate the start and end timeslot numbers of a range. The value range for the timeslot number is 1 to 31.
Usage guidelines
A CE1 interface in CE1 mode is physically divided into 32 timeslots numbered 0 through 31. All the timeslots except timeslot 0 can be bundled into multiple channel sets. For each channel set, the system automatically creates a serial interface that has the same logical features as a standard synchronous serial interface.
The serial interface name uses the serial interface-number:set-number format. The interface-number argument specifies the CE1 interface number. The set-number argument specifies the channel set number.
Examples
# Bundle timeslots 1, 2, 5, 10 through 15, and 18 into channel set 0 on E1 1/1/0.
<Sysname> system-view
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] channel-set 0 timeslot-list 1,2,5,10-15,18
clock (CE1 interface)
Use clock to set the clock mode of a CE1 interface.
Use undo clock to restore the default.
Syntax
clock { master | slave }
undo clock
Default
The clock mode of a CE1 interface is slave.
Views
CE1 interface view
Predefined user roles
network-admin
Parameters
master: Sets the clock mode to master.
slave: Sets the clock mode to slave.
Usage guidelines
When the clock mode of an interface is master, it uses the internal clock source. When the clock mode of an interface is slave, it uses the line clock source.
Set the clock mode for an interface according to its operating mode:
· When the interface is operating in DCE mode, set its clock mode to master.
· When the interface is operating in DTE mode, set its clock mode to slave.
Examples
# Set the clock mode to master for CE1 interface E1 1/1/0.
<Sysname> system-view
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] clock master
clock-change auto
Use clock-change auto to enable automatic clock mode switchover on an interface.
Use undo clock-change auto to disable automatic clock mode switchover.
Syntax
clock-change auto
undo clock-change auto
Default
Automatic clock mode switchover is disabled on an interface.
Views
CE1 interface view
Predefined user roles
network-admin
Usage guidelines
When automatic clock mode switchover is enabled, the interface automatically switches to the master clock mode when both of the following conditions exist:
· The interface uses the slave clock mode.
· The interface receives an alarm indication signal (AIS), loss of signal (LOS), or loss of frame (LOF) alarm.
After the alarm is cleared, the interface automatically switches back to the slave mode.
When automatic clock mode switchover is disabled, the interface uses the user-configured clock mode.
Examples
# Enable automatic clock mode switchover for E1 1/1/0.
<Sysname> system-view
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] clock-change auto
Related commands
clock
code (CE1 interface)
Use code to set the line code format for a CE1 interface.
Use undo code to restore the default.
Syntax
code { ami | hdb3 }
undo code
Default
The line code format is HDB3 for the CE1 interface.
Views
CE1 interface view
Predefined user roles
network-admin
Parameters
ami: Specifies the alternate mark inversion (AMI) line code format.
hdb3: Specifies the high-density bipolar 3 (HDB3) line code format.
Usage guidelines
An interface must use the same line code format as its remote end.
For the interface to operate correctly, configure the data-coding inverted command on the interface if the AMI format is used.
Examples
# Set the line code format to AMI for E1 1/1/0.
<Sysname> system-view
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] code ami
Related commands
data-coding
controller e1
Use controller e1 to enter CE1 interface view.
Syntax
controller e1 interface-number
Views
System view
Predefined user roles
network-admin
Parameters
interface-number: Specifies a CE1 interface by its number.
Examples
# Enter E1 1/1/0 interface view.
<Sysname> system-view
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0]
data-coding (CE1 interface)
Use data-coding to enable user data inversion on a CE1 interface.
Use undo data-coding to restore the default.
Syntax
data-coding { inverted | normal }
undo data-coding
Default
Data inversion is disabled on a CE1 interface.
Views
CE1 interface view
Predefined user roles
network-admin
Parameters
inverted: Enables user data inversion.
normal: Disables user data inversion.
Usage guidelines
To prevent 7e in valid data from being mistaken for padding characters, HDLC inserts a zero after every five consecutive ones in the data stream. In data inversion, each bit one is inverted to bit zero, and each bit zero is inverted to bit one. After the inversion, at least a bit one is present in every eight consecutive bits.
When AMI encoding is used on an E1 interface, data inversion eliminates the presence of multiple consecutive zeros.
The data inversion setting must be the same on the CE1 interfaces at two ends of an E1 line.
Examples
# Enable user data inversion on E1 1/1/0.
<Sysname> system-view
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] data-coding inverted
detect-ais
Use detect-ais to enable alarm indication signal (AIS) detection on an interface.
Use undo detect-ais to disable AIS detection.
Syntax
detect-ais
undo detect-ais
Default
AIS detection is enabled on an interface.
Views
CE1 interface view
Predefined user roles
network-admin
Usage guidelines
This command takes effect when a CE1 interface operates in E1 mode.
Examples
# Enable AIS detection on E1 1/1/0.
<Sysname> system-view
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] detect-ais
display controller e1
Use display controller e1 to display information about CE1 interfaces.
Syntax
display controller [ e1 [ interface-number ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
e1 [ interface-number ]: Specifies a CE1 interface by its number. If you do not specify the e1 keyword, the command displays information about all CE1 interfaces and CPOS interfaces. If you specify the e1 keyword without specifying an interface, the command displays information about all CE1 interfaces.
Examples
# Display information about CE1 interface E1 2/3/0.
<Sysname> display controller e1 2/3/0
E1 2/3/0
Current state: DOWN
Description: E1 2/3/0 Interface
Last clearing of counters: Never
Current system time:2020-08-10 10:32:07
Last time when physical state changed to up:-
Last time when physical state changed to down:2020-08-07 16:05:48
Basic Configuration:
Work mode is E1 framed, Cable type is non-E1 type.
Frame-format is no-crc4.
Line code is ami, Source clock is master.
Idle code is 7e, Itf type is 7e, Itf number is 0.
Loop back is not set.
Alarm State:
Receiver alarm state is Loss-of-Signal.
Transmitter is sending remote alarm.
Historical Statistics:
Data in current interval (239175 seconds elapsed):
0 Loss Frame Alignment Secs, 0 Framing Error Secs,
0 CRC Error Secs, 0 Alarm Indication Secs, 239175 Loss-of-signals Secs,
0 Code Violations Secs, 0 Slip Secs, 0 E-Bit error Secs
Table 3 Command output
|
Field |
Description |
|
Current state |
Physical link state of the interface: · Administratively DOWN—The interface has been shut down by using the shutdown command. · DOWN—The interface is administratively up, but its physical state is down (possibly because no physical link exists or the link has failed). · UP—The interface is both administratively and physically up. |
|
Description |
Description of the interface. |
|
Work mode |
Operating mode of the interface: E1 or CE1. |
|
Cable type |
Cable type of the interface. |
|
Frame-format |
Framing format of the E1 interface. |
|
Line code |
Line code: AMI or HDB3. |
|
Source clock |
Clock source used by the interface: master or slave. |
|
Idle code |
Idle code: 7e or ff. |
|
Itf type |
Interframe filling tag: 7e or ff. |
|
Itf number |
Number of interframe filling tags between two successive frames. |
|
Loopback |
Loopback state. |
|
Historical Statistics |
Statistics for the interface. |
|
Last clearing of counters |
The most recent time that the reset counters controller e1 command was executed. This field displays Never if this command has not been executed since the device startup. |
|
Data in current interval (239175 seconds elapsed): 0 Loss Frame Alignment Secs, 0 Framing Error Secs, 0 CRC Error Secs, 0 Alarm Indication Secs, 239175 Loss-of-signals Secs, 0 Code Violations Secs, 0 Slip Secs, 0 E-Bit error Secs. |
Error statistics for the current interval. |
Related commands
reset counters controller e1
frame-format (CE1 interface)
Use frame-format to set the framing format for a CE1 interface.
Use undo frame-format to restore the default.
Syntax
frame-format { crc4 | no-crc4 }
undo frame-format
Default
The framing format on a CE1 interface is no-CRC4.
Views
CE1 interface view
Predefined user roles
network-admin
Parameters
crc4: Sets the framing format to CRC4.
no-crc4: Sets the framing format to no-CRC4.
Usage guidelines
A CE1 interface in CE1 mode supports both CRC4 and no-CRC4 framing formats. Only CRC4 supports four-bit CRC on physical frames.
Examples
# Set the framing format to CRC4 on E1 1/1/0.
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] frame-format crc4
loopback (CE1 interface)
Use loopback to enable loopback and set the loopback mode on an interface.
Use undo loopback to disable loopback on an interface.
Syntax
loopback { local | payload | remote }
undo loopback
Default
Loopback is disabled on a CE1 interface.
Views
CE1 interface view
Predefined user roles
network-admin
Parameters
local: Sets the interface to operate in local loopback mode.
payload: Sets the interface to operate in external payload loopback mode.
remote: Sets the interface to operate in external loopback mode.
Usage guidelines
Loopback is intended for testing only. Disable the feature when the interface is operating correctly.
You can bundle timeslots on the CE1 interface to form a serial interface and encapsulate it with PPP. After you enable loopback on this serial interface, it is normal that the state of the link layer protocol is reported as down.
Examples
# Set E1 1/1/0 to operate in internal loopback mode.
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] loopback local
reset counters controller e1
Use reset counters controller e1 to clear CE1 interface statistics.
Syntax
reset counters controller e1 [ interface-number ]
Views
User view
Predefined user roles
network-admin
Parameters
interface-number: Specifies a CE1 interface by its number. If you do not specify this argument, the command clears statistics for all CE1 interfaces.
Usage guidelines
The reset counters interface command clears statistics for all interfaces.
To display CE1 interface statistics, use the display controller e1 command.
Examples
# Clear statistics for CE1 interface E1 1/1/0.
<Sysname> reset counters controller e1 1/1/0
Related commands
display controller e1
using (CE1 interface)
Use using to set the operating mode of a CE1 interface.
Use undo using to restore the default.
Syntax
using { ce1 | e1 }
undo using
Default
A CE1 interface operates in channelized mode.
Views
CE1 interface view
Predefined user roles
network-admin
Parameters
ce1: Sets the interface to operate in channelized mode.
e1: Sets the interface to operate in E1 mode.
Usage guidelines
A CE1 interface can operate in channelized or unchannelized mode.
· Channelized modes include CE1 mode and PRI mode. In mode, the CE1 interface is physically divided into 32 timeslots numbered 0 through 31. Timeslot 0 is used for FSC.
· Unchannelized modes include E1 mode.
¡ For a CE1/PRI interface in E1 mode, the system automatically creates a 2.048 Mbps serial interface. The interface name uses the serial interface-number:0 format. The interface-number argument specifies the CE1 interface number. This interface has the same logical features as a standard synchronous serial interface.
Examples
# Set E1 1/1/0 to operate in E1 mode.
<Sysname> system-view
[Sysname] controller e1 1/1/0
[Sysname-E1 1/1/0] using e1
