Login
- Table of Contents
- Related Documents
-
| Title | Size | Download |
|---|---|---|
| 06-ATM interface commands | 98.58 KB |
ATM interface commands
Common ATM interface commands
alarm-detect
Use alarm-detect to configure the action to take when an RDI, SD, or SF alarm occurs on an interface.
Use undo alarm-detect to restore the default.
Syntax
alarm-detect { rdi | sd | sf } action link-down
undo alarm-detect { rdi | sd | sf }
Default
The device does not take any actions on the interface when an alarm occurs.
Views
ATM interface view
Predefined user roles
network-admin
Parameters
rdi: Specifies remote defect indication (RDI) alarms.
sd: Specifies signal degrade (SD) alarms.
sf: Specifies signal fail (SF) alarms.
action: Specifies the action to take when the specified alarm is detected on the interface.
link-down: Shuts down the interface.
Usage guidelines
When the device receives multiplexer section remote defect indication (MS-RDI) signals from the remote end, an RDI alarm occurs.
When the bit error rate of incoming packets reaches the SD or SF alarm threshold, an SD or SF alarm occurs.
Examples
# Shut down ATM 3/2/1 when an RDI alarm occurs on it.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] alarm-detect rdi action link-down
bandwidth
Use bandwidth to configure the expected bandwidth for 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
ATM 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 ATM 3/2/1 to 50 kbps.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] bandwidth 50
default
Use default to restore the default settings for an interface.
Syntax
default
Views
ATM interface view
ATM subinterface view
Predefined user roles
network-admin
Usage guidelines
|
|
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 ATM 3/2/1.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] 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 description of an interface is interface name Interface, for example, ATM 3/2/1 Interface.
Views
ATM interface view
ATM subinterface 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 ATM 3/2/1 as atmswitch-interface.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] description atmswitch-interface
display counters
Use display counters to display ATM interface traffic statistics.
Syntax
display counters { inbound | outbound } interface [ atm [ interface-number ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
inbound: Displays inbound traffic statistics.
outbound: Displays outbound traffic statistics.
atm [ interface-number ]: Specifies an ATM interface by its number. If you do not specify the atm keyword, this command displays traffic statistics for all interfaces that have traffic counters. If you specify the atm keyword but do not specify the interface-number argument, this command displays traffic statistics for all ATM interfaces.
Examples
# Display inbound traffic statistics for ATM 3/2/1.
Interface Total (pkts) Broadcast (pkts) Multicast (pkts) Err (pkts)
ATM3/2/1 0 -- -- 0
Overflow: More than 14 digits (7 digits for column "Err").
--: Not supported.
Table 1 Command output
|
Field |
Description |
|
Interface |
Abbreviated interface name. |
|
Total (pkts) |
Total number of packets that the interface receives or sends. |
|
Broadcast (pkts) |
Total number of broadcast packets that the interface receives or sends. |
|
Multicast (pkts) |
Total number of multicast packets that the interface receives or sends. |
|
Err (pkts) |
Total number of error packets that the interface receives or sends. |
|
Overflow: for column “Err” |
The field displays Overflow when one of the following conditions exist: · The data length of an Err field value is greater than 7 decimal digits. · The data length of a non-Err field value is greater than 14 decimal digits. |
|
--: Not supported. |
The statistical item is not supported. |
Related commands
reset counters interface
display counters rate
Use display counters rate to display traffic rate statistics for interfaces in up state over the most recent statistics interval.
Syntax
display counters rate { inbound | outbound } interface [ atm [ interface-number ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
inbound: Displays inbound traffic rate statistics.
outbound: Displays outbound traffic rate statistics.
atm [ interface-number ]: Specifies an ATM interface by its number. If you do not specify the atm keyword, this command displays traffic rate statistics for all up interfaces in the most recent statistics interval. If you specify the atm keyword but do not specify the interface-number argument, this command displays traffic rate statistics for all up ATM interfaces in the most recent statistics interval.
Usage guidelines
You can use the flow-interval command to set the statistics interval.
Examples
# Display the inbound traffic rate statistics for ATM 3/2/1.
<Sysname> display counters rate inbound interface atm 3/2/1
Usage: Bandwidth utilization in percentage
Interface Usage (%) Total (pps) Broadcast (pps) Multicast (pps)
ATM3/2/1 -- 0 -- --
Overflow: More than 14 digits.
--: Not supported.
Table 2 Command output
|
Field |
Description |
|
Interface |
Abbreviated interface name. |
|
Usage (%) |
Interface bandwidth usage (in percentage) for the most recent statistics interval. |
|
Total (pps) |
Average receiving or sending rate (in pps) for all packets for the most recent statistics interval. |
|
Broadcast (pps) |
Average receiving or sending rate (in pps) for broadcast packets for the most recent statistics interval. |
|
Multicast (pps) |
Average receiving or sending rate (in pps) for multicast packets for the most recent statistics interval. |
|
Overflow: More than 14 digits. |
Indicates that the data length of a statistical item is greater than 14 decimal digits. |
|
--: Not supported. |
The statistical item is not supported. |
Related commands
reset counters interface
display interface atm
Use display interface atm to display information about ATM interfaces.
Syntax
display interface [ atm [ interface-number ] ] [ brief [ description | down ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
atm [ interface-number ]: Specifies an ATM interface by its number. If you do not specify the atm keyword, this command displays information about all interfaces. If you specify the atm keyword but do not specify the interface-number argument, this command displays information about all ATM 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 27 characters of interface descriptions.
down: Displays information about interfaces in physically DOWN state and the causes. If you do not specify this keyword, the command displays information about interfaces in all states.
Examples
# Display detailed information about ATM 3/2/1.
<Sysname> display interface atm 3/2/1
ATM3/2/1
Current state: UP
Line protocol state: UP
Description: atmswitch-interface
Bandwidth: 100 kbps
Maximum transmission unit: 1500
Internet protocol processing: Disabled
AAL enabled: AAL5
Current VCs: 0 (0 on main interface)
Port connector type is No connector
Last link flapping: 0 hours 4 minutes 8 seconds
Last clearing of counters: Never
Current system time:2017-12-28 15:50:34
Last time when physical state changed to up:2017-12-28 15:46:27
Last time when physical state changed to down:2017-12-28 10:37:49
Physical layer is packet over SDH
Port speed type: STM-4
Loopback is local
Clock source: Slave
Clock grade: Quality unknown(existing synchronization network)
SPE scrambling: Enable
BER thresholds:
SD: 10e-6 SF: 10e-3
Regenerator section layer:
J0(TX): "CR16000"
43 52 31 36 30 30 30 00 00 00 00 00 00 00 00 00
J0(RX): ""
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Alarm: LOF OOF TIM
Error: 0 BIP(B1)
Multiplex section layer:
Alarm: AIS
Error: 0 BIP(B2), 0 REI(M1)
Higher order path layer:
C2(TX): 0x13 C2(RX): 0xff
J1(TX): "CR16000"
43 52 31 36 30 30 30 00 00 00 00 00 00 00 00 00
J1(RX): ""
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Alarm: AIS RDI SLM
Error: 0 BIP(B3), 0 REI(G1)
0 PJE, 0 NJE
Port statistic:start time: 2017-12-28 10:37:59
UP time: 0 H 0 M 0 S
Section: ES 0 SES 0 SEFS 0
Line : ES 0 SES 0 UAS 0 FE-ES 0
Last 300 seconds input: 0 packets/s, 0 bytes/s
Last 300 seconds output: 0 packets/s, 0 bytes/s
Input : 0 packets, 0 bytes, 0 buffers
0 errors, 0 crcs, 0 lens, 0 giants,
0 pads, 0 aborts, 0 timeouts,
0 overflows, 0 overruns, 0 no buffer
Output: 0 packets, 0 bytes, 0 buffers
0 errors, 0 overflows, 0 underruns
Peak value of input: 0 bytes/sec, at 2017-12-28 10:37:59
Peak value of output: 0 bytes/sec, at 2017-12-28 10:37:59
# Display brief information about ATM 3/2/1.
<Sysname> display interface atm 3/2/1 brief
Brief information on interfaces in route mode:
Link: ADM - administratively down; Stby - standby
Protocol: (s) - spoofing
Interface Link Protocol Primary IP Description
ATM3/2/1 UP UP --
# Display brief information, including the causes, for all ATM interfaces in physically DOWN state.
<Sysname> display interface atm brief down
Brief information on interfaces in route mode:
Link: ADM - administratively down; Stby - standby
Interface Link Cause
ATM3/2/1 DOWN Not connected
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. |
|
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. |
|
Description |
Description of the interface. |
|
Bandwidth |
Expected bandwidth of the interface. |
|
Maximum transmission unit |
MTU of the interface. |
|
Internet protocol processing: Disabled |
The interface is not assigned an IP address and cannot process IP packets. |
|
Internet Address |
IP address of the interface. The primary attribute indicates that the address is the primary IP address. |
|
AAL enabled |
AAL type enabled on the interface. The ATM interface supports only ATM Adaptation Layer 5 (AAL5). |
|
Current VCs: 0 (0 on main interface) |
Number of virtual circuits configured on the interface. Contents in the parentheses indicate the number of virtual circuits configured on the primary interface. |
|
Port connector type |
Type of the transceiver module on the interface. |
|
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. |
|
Last clearing of counters |
Time when the reset counters interface command was last used to clear the interface statistics. This field displays Never if the reset counters interface command has never been used on the interface since device startup. |
|
Current system time |
Current system time in the YYYY-MM-DD HH:MM:SS format. If the time zone is configured, this field is in the YYYY-MM-DD HH:MM:SS UTC±HH:MM:SS format. |
|
Last time when physical state changed to up |
Last time when physical state of the interface changed to up. A hyphen (-) indicates that the physical state of the interface has not changed to up. |
|
Last time when physical state changed to down |
Last time when physical state of the interface changed to down. A hyphen (-) indicates that the physical state of the interface has not changed to down. |
|
Physical layer |
Physical layer status. |
|
Port speed type |
Interface transmission rate. |
|
Loopback |
Loopback mode of the interface: · cell—Internal cell loopback. · local—Internal loopback. · remote—External line loopback. |
|
Clock source |
Clock mode of the interface: master or slave. |
|
SPE scrambling |
Scrambling state of the interface. |
|
BER thresholds |
SD threshold and SF threshold of the interface. |
|
Regenerator section layer |
Regenerator section statistics: · J0(TX)—Transmitted J0 trace message value. · J0(RX)—Received J0 trace message value. · Alarm—Alarm statistics. · Error—Error statistics. |
|
Multiplex section layer |
Alarm and error statistics for the multiplex section. |
|
Higher order path layer |
Higher-order path statistics: · C2(TX)—Transmitted C2 bytes. · C2(RX)—Received C2 bytes. · J1(TX)—Transmitted J1 trace message value. · J1(RX)—Received J1 trace message value. · Alarm—Alarm statistics. · Error—Error statistics. |
|
Port statistic:start time |
Starting time for interface statistics. |
|
UP time |
Time when the interface was brought up. |
|
Section |
Alarm seconds for the regenerator section: · Error Seconds (ES)—Minor error alarm seconds. · Serious Error Seconds (SES)—Sever error alarm seconds. · Serious Error Frame Seconds (SEFS)—Sever frame error alarm seconds. |
|
Line |
Alarm seconds for the multiplex section: · Error Seconds (ES)—Minor error alarm seconds. · Serious Error Seconds (SES)—Sever error alarm seconds. · Unavailable Seconds (UAS)—Unavailable alarm seconds. This field value starts to count after 10 seconds of continuous SES. · FE-ES—Alarm seconds for remote errors. This field value starts to count when the peer end sends an REI RDI alarm. |
|
Last 300 seconds input: 0 packets/s, 0 bytes/s |
Average input rates (in pps and Bps) for the last 300 seconds. |
|
Last 300 seconds output: 0 packets/s, 0 bytes/s |
Average output rates (in pps and Bps) for the last 300 seconds. |
|
Input: 0 packets, 0 bytes, 0 buffers 0 errors, 0 crcs, 0 lens, 0 giants 0 pads, 0 aborts, 0 timeouts 0 overflows, 0 overruns, 0 no buffer |
Packet input parameters: · packets—Number of total packets received. · bytes—Number of total bytes received. · buffers—Number of buffers used to receive packets. · errors—Number of error packets detected in the physical layer. · crcs—Number of CRC errors. · lens—Number of packets received in invalid lengths. · giants—Number of packets received in lengths exceeding the set value. · pads—Number of errors occurred in the packet padding process. · aborts—Number of anomalous errors. · timeouts—Number of timeout packets. · overflows—Number of chip FIFO overflow errors occurred in the receiving process. · overruns—Number of packets unprocessed due to high receiving rates exceeding the forwarding rate. · no buffer—Number of errors caused by insufficient system resources. |
|
Output: 0 packets, 0 bytes, 0 buffers 0 errors, 0 overflows, 0 underruns |
Packet output parameters: · packets—Number of total packets transmitted. · bytes—Number of total bytes transmitted. · buffers—Number of buffers used to transmit packets. · errors—Number of error packets detected in the physical layer. · overflows—Number of chip FIFO overflow errors occurred in the transmitting process. · underruns—Number of packets untransmitted because the interface reading rate was lower than the forwarding rate. |
|
Peak value of input |
Peak value of input packets. |
|
Peak value of output |
Peak value of output packets. |
|
Brief information on interfaces in route mode |
Brief information about Layer 3 interfaces. |
|
Interface |
Abbreviation of the interface name. |
|
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. |
|
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. |
|
Primary IP |
Primary IP address of the interface. This field displays two hyphens (--) if the interface does not have an IP address. |
|
Description |
Description of the interface. |
|
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). |
interface atm
Use interface atm to create an ATM subinterface and enter its view, or enter the view of an existing ATM interface or ATM subinterface.
Use undo interface atm to remove an ATM subinterface.
Syntax
interface atm { interface-number | interface-number.subnumber [ p2mp | p2p ] }
undo interface atm interface-number.subnumber
Default
No ATM subinterfaces exist.
Views
System view
Predefined user roles
network-admin
Parameters
interface-number: Specifies an ATM interface by its number.
interface-number.subnumber: Specifies an ATM subinterface by its number. The interface-number argument represents the number of the ATM interface. The subnumber argument represents the number of the subinterface, in the range of 0 to 1023.
p2mp: Specifies a point-to-multipoint subinterface. A subinterface is P2MP type by default.
p2p: Specifies a point-to-point subinterface.
Examples
# Enter ATM 3/2/1 interface view.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1]
# Create ATM subinterface ATM 3/2/1.1 and enter its view.
<Sysname> system-view
[Sysname] interface atm3/2/1.1
[Sysname-ATM3/2/1.1]
mtu
Use mtu to set the MTU value 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
ATM interface view
ATM subinterface view
Predefined user roles
network-admin
Parameters
size: Specifies the maximum transmission unit (MTU) in bytes. The value range for this argument varies by card model.
Usage guidelines
The MTU setting affects IP packet reassembly and fragmentation on the interface.
Follow these guidelines when you set the MTU for an interface:
· IP packets received by an incoming interface cannot be fragmented based on the MTU set for the outgoing interface if the incoming interface is on one of the following cards:
¡ CSPC (except CSPC-GE16XP4L-E, CSPC-GE24L-E, and CSPC-GP24GE8XP2L-E).
¡ CMPE-1104.
· IP packets are fragmented to each fragment of 1280 bytes when the following conditions are met:
¡ An interface on a CSPC-GE16XP4L-E, CSPC-GE24L-E, CSPC-GP24GE8XP2L-E, CSPEX, or CEPC card acts as the incoming interface.
¡ The configured MTU value for the outgoing interface is less than 1280.
If the device is installed with the above cards, as a best practice, set the outgoing interface MTU to a value greater than 1280.
Examples
# Set the MTU of ATM 3/2/1 to 200 bytes.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] mtu 200
reset counters interface
Use reset counters interface to clear the statistics for an ATM interface.
Syntax
reset counters interface [ atm [ interface-number ] ]
Views
User view
Predefined user roles
network-admin
Parameters
atm [ interface-number ]: Specifies an ATM interface by its number. If you do not specify the atm keyword, this command clears statistics for all interfaces. If you specify the atm keyword but do not specify the interface-number argument, this command clears statistics for all ATM interfaces.
Usage guidelines
Use this command to clear history statistics before you collect traffic statistics for a time period.
Examples
# Clear statistics for ATM 3/2/1.
<Sysname> reset counters interface atm 3/2/1
shutdown
Use shutdown to shut down an ATM interface.
Use undo shutdown to bring up an ATM interface.
Syntax
shutdown
undo shutdown
Default
An ATM interface is up.
Views
ATM interface view
ATM subinterface view
Predefined user roles
network-admin
Examples
# Shut down ATM 3/2/1.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] shutdown
ATM OC-3c/STM-1 and ATM OC-12c/STM-4 interface commands
clock
Use clock to set the clock mode for an ATM interface.
Use undo clock to restore the default.
Syntax
clock { master | slave }
undo clock
Default
The clock mode for an ATM interface is slave.
Views
ATM OC-3c/STM-1 interface view
ATM OC-12c/STM-4 interface view
Predefined user roles
network-admin
Parameters
master: Specifies the internal clock as the clock source.
slave: Specifies the line clock as the clock source.
Usage guidelines
The clock of the SONET/SDH network is more precise than the internal clock of ATM interfaces. When an ATM interface is connected to a SONET/SDH device, set the clock mode of the ATM interface to slave.
When the ATM interfaces on two devices are connected directly through a fiber-optic cable, set the clock mode to master at one end and to slave at the other end.
Examples
# Set the clock mode of ATM 3/2/1 to master.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] clock master
flag
Use flag to set a SONET/SDH overhead byte.
Use undo flag to restore the default of the specified SONET/SDH overhead byte.
Syntax
flag c2 flag-value
undo flag c2
flag { j0 | j1 } { sdh | sonet } flag-value
undo flag { j0 | j1 } { sdh | sonet }
Default
The value of c2 is 13 (hexadecimal).
The system uses the SDH frame format. The default values for j0 and j1 are both CR16000.
Views
ATM OC-3c/STM-1 interface view
ATM OC-12c/STM-4 interface view
Predefined user roles
network-admin
Parameters
c2 flag-value: Specifies the C2 byte. The C2 byte is a higher-order path overhead byte used to indicate the multiplex structure of virtual container (VC) frames and property of payload. It is a hexadecimal number in the range of 0 to ff.
j0 flag-value: Specifies the J0 byte. The J0 byte is a section overhead byte used to test continuity of the connection between two interfaces at the section level. If the sdh keyword is configured, the flag-value argument is a string of 1 to 15 hexadecimal digits. If the sonet keyword is configured, the argument is a hexadecimal number in the range of 0 to ff.
j1 flag-value: Specifies the J1 byte. The J1 byte is a higher-order path overhead byte used to test continuity of the connection between two interfaces at the path level. If the sdh keyword is configured, the flag-value argument is a string of 1 to 15 hexadecimal digits. If the sonet keyword is configured, the argument is a string of 1 to 62 characters.
sdh: Sets frame format to Synchronous Digital Hierarchy (SDH).
sonet: Sets frame format to Synchronous Optical Network (SONET).
Usage guidelines
When the C2 byte of one end is set to 1, the C2 byte of the other end can be set to any character in hexadecimal notation. If the C2 byte of either ends of a link is not set to 1, the C2 byte must be the same at both ends.
The J1 settings on the sending and receiving ends must be the same.
The J0 byte can be any character in the network of the same carrier. On networks of two carriers, the sending and receiving devices at network borders must use the same J0 byte.
Examples
# Set the SDH overhead byte J0 of ATM 3/2/1 to ff (hexadecimal).
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] flag j0 sdh ff
frame-format
Use frame-format to set the frame format of an ATM interface.
Use undo frame-format to restore the default.
Syntax
frame-format { sdh | sonet }
undo frame-format
Default
The frame format of an ATM interface is SDH.
Views
ATM OC-3c/STM-1 interface view
ATM OC-12c/STM-4 interface view
Predefined user roles
network-admin
Parameters
sdh: Sets the frame format to SDH.
sonnet: Sets the frame format to SONET.
Usage guidelines
The overhead bytes configured with the flag command must match the frame format.
Examples
# Set the frame format on ATM 3/2/1 to SDH.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] frame-format sdh
Related commands
link-delay
Use link-delay to set the physical state change suppression interval on an ATM interface.
Use undo link-delay to restore the default.
Syntax
link-delay seconds
undo link-delay
Default
The physical state change suppression interval is 1 second.
Views
ATM OC-3c/STM-1 interface view
ATM OC-12c/STM-4 interface view
Predefined user roles
network-admin
Parameters
seconds: Specifies a physical state change suppression interval in the range of 0 to 60 seconds.
Usage guidelines
When the physical state changes, an ATM interface reports the event to the upper-layer modules, and generates log and SNMP notification messages. To reduce system overhead caused by frequent physical state changes, use this command to suppress physical state changes within an interval. The interface will ignore any changes that occur during each suppression interval. When the suppression interval expires, the interface will not report the change event or generate messages if the change is removed.
For example, the suppression interval starts when the interface changes from up to down. The interface reports the change event and generates messages if it is still down when the interval expires. The interface does not report the change event or generate messages if it is up when the interval expires.
Examples
# Set the physical state change suppression interval to 20 seconds on ATM 3/2/1.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] link-delay 20
loopback
Use loopback to enable loopback and set the loopback mode on an ATM interface.
Use undo loopback to disable loopback on an ATM interface.
Syntax
loopback { cell | local | remote }
undo loopback
Default
Loopback is disabled on an ATM interface.
Views
ATM OC-3c/STM-1 interface view
ATM OC-12c/STM-4 interface view
Predefined user roles
network-admin
Parameters
cell: Enables internal cell loopback to check physical chips on the local end.
local: Enables internal loopback to check service chips on the local end.
remote: Enables external line loopback to check the remote end.
Usage guidelines
Loopback is intended for testing only. Disable loopback when the interface is operating correctly.
Examples
# Enable internal loopback on ATM 3/2/1.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] loopback local
scramble
Use scramble to enable payload scrambling on an ATM interface.
Use undo scramble to disable payload scrambling on an ATM interface.
Syntax
scramble
undo scramble
Default
Payload scrambling is enabled on an ATM interface.
Views
ATM OC-3c/STM-1 interface view
ATM OC-12c/STM-4 interface view
Predefined user roles
network-admin
Usage guidelines
Payload scrambling enables an interface to scramble outgoing data and descramble incoming data. By preventing the presence of long strings of all 1s or all 0s, payload scrambling enables the receiving end to extract the line clock signal correctly.
If payload scrambling is disabled, the interface does not scramble outgoing data or descramble incoming data.
The payload scrambling setting must be the same at both ends of a link.
For H3C devices, changing the payload scrambling setting does not affect cell headers. After you change the payload scrambling settings on both ends of a link, verify that the C2 byte value on them match each other. If the two values do not match, use the flag c2 command to modify the C2 byte value on the H3C device.
Examples
# Enable payload scrambling on ATM 3/2/1.
<Sysname> system-view
[Sysname] interface atm 3/2/1
[Sysname-ATM3/2/1] scramble
