Login
- Table of Contents
- Related Documents
-
| Title | Size | Download |
|---|---|---|
| 04-Data buffer commands | 96.41 KB |
buffer packet-drop alarm enable
buffer packet-drop alarm interval
buffer threshold alarm interval
buffer usage threshold all-queue
buffer usage threshold headroom
buffer usage threshold headroom queue
buffer usage threshold service-pool
display buffer usage interface
Data buffer commands
Inappropriate data buffer changes can cause system problems. Before manually changing data buffer settings, make sure you understand its impact on your device. As a best practice, use the burst-mode enable command if the system requires large buffer spaces. The burst-mode enable command and the buffer apply command are mutually exclusive. If you have configured the data buffer by using one command, you must execute the undo form of the command before using the other command.
buffer apply
Use buffer apply to apply manually configured data buffer settings.
Use undo buffer apply to restore the default.
Syntax
buffer apply
undo buffer apply
Default
Manually configured data buffer settings are not applied.
Views
System view
Predefined user roles
network-admin
Usage guidelines
For data buffer settings to take effect, you must execute this command after configuring data buffer settings.
After applying manually configured data buffer settings, you cannot directly modify the applied settings. To modify them, you must cancel the application, reconfigure data buffer settings, and reapply the new settings.
Examples
# Apply manually configured data buffer settings.
<Sysname> system-view
[Sysname] buffer apply
buffer packet-drop alarm enable
Use buffer packet-drop alarm enable to enable packet-drop alarms.
Use undo buffer packet-drop alarm enable to disable packet-drop alarms.
Syntax
buffer packet-drop alarm enable
undo buffer packet-drop alarm enable
Default
Packet-drop alarms are disabled.
Views
System view
Predefined user roles
network-admin
Usage guidelines
The device generates and reports packet-drop alarms to a network management system (such as IMC) for displaying the data buffer usage.
This command does not take effect only on the Headroom buffer.
Examples
# Enable packet-drop alarms.
<Sysname> system-view
[Sysname] buffer packet-drop alarm enable
Related commands
buffer usage threshold queue
buffer packet-drop alarm interval
buffer packet-drop alarm interval
Use buffer packet-drop alarm interval to set the interval for sending packet-drop alarms.
Use undo buffer packet-drop alarm interval to restore the default.
Syntax
buffer packet-drop alarm interval interval
undo buffer packet-drop alarm interval
Default
The interval for sending packet-drop alarms is 5 seconds.
Views
System view
Predefined user roles
network-admin
Parameters
interval: Specifies the interval for sending packet-drop alarms, in the range of 0 to 60 seconds. The value of 0 indicates that packet-drop alarms are sent immediately after they are generated.
Usage guidelines
This command takes effect only when packet-drop alarms are enabled.
Examples
# Set the interval for sending packet-drop alarms to 20 seconds.
<Sysname> system-view
[Sysname] buffer packet-drop alarm interval 20
Related commands
buffer packet-drop alarm enable
buffer service-pool shared
Use buffer service-pool shared to set the maximum shared-area ratio or size for a service pool.
Use undo buffer service-pool shared to delete the maximum shared-area ratio or size setting of a service pool.
Syntax
buffer ingress [ slot slot-number ] cell service-pool sp-id shared ratio ratio
undo buffer ingress [ slot slot-number ] cell service-pool sp-id shared
Default
All of the shared area is reserved for service pool 0.
Views
System view
Predefined user roles
network-admin
Parameters
ingress: Specifies the ingress buffer.
slot slot-number: Specifies a card by its slot number.
cell: Specifies cell resources.
service-pool sp-id: Specifies a service pool by its ID. The value range for the sp-id argument is 1 to 3.
ratio ratio: Specifies the maximum shared-area ratio, in percentage. The value range for ratio is 0 to 99.
Usage guidelines
This command takes effect after you executed the buffer apply command.
The sum of the fixed-area ratios configured for all queues cannot exceed 100%. The queue that causes the sum of the fixed-area ratios to exceed 100% fails to be configured and still uses the default setting.
If you specify the slot slot-number option, this commmand applies to the specified slot. If you do not specify the option, this commmand applies to all slots. The configuration for a slot have higher priority over the configuration for all slots.
Examples
# Configure service pool 1 to use up to 50% shared-area space of cell resources in the egress buffer.
<Sysname> system-view
[Sysname] buffer egress cell service-pool 1 shared ratio 50
Related commands
buffer apply
buffer threshold alarm enable
Use buffer threshold alarm enable to enable threshold-crossing alarms.
Use undo buffer threshold alarm enable to disable threshold-crossing alarms.
Syntax
buffer threshold alarm { egress | headroom | ingress } enable
undo buffer threshold alarm { egress | headroom | ingress } enable
Default
Threshold-crossing alarms are disabled.
Views
System view
Predefined user roles
network-admin
Parameters
ingress: Specifies the ingress buffer.
headroom: Specifies the Headroom buffer.
egress: Specifies the egress buffer.
Usage guidelines
The device generates and reports threshold-crossing alarms to a network management system (such as IMC) for displaying the data buffer usage.
Examples
# Enable threshold-crossing alarms.
<Sysname> system-view
[Sysname] buffer threshold alarm ingress enable
Related commands
buffer usage threshold headroom
buffer usage threshold headroom queue
buffer usage threshold queue (interface view)
buffer usage threshold queue (system view)
buffer threshold alarm interval
Use buffer threshold alarm interval to set the interval for sending threshold-crossing alarms.
Use undo buffer threshold alarm interval to restore the default.
Syntax
buffer threshold alarm { egress | headroom | ingress } interval interval
undo buffer threshold alarm { egress | headroom | ingress } interval
Default
The interval for sending threshold-crossing alarms is 5 seconds.
Views
System view
Predefined user roles
network-admin
Parameters
ingress: Specifies the ingress buffer.
headroom: Specifies the Headroom buffer.
egress: Specifies the egress buffer.
interval: Specifies the interval for sending threshold-crossing alarms, in the range of 0 to 60 seconds. The value 0 indicates that threshold-crossing alarms are sent immediately after they are generated.
Usage guidelines
This command takes effect only when threshold-crossing alarms are enabled.
Examples
# Set the interval for sending threshold-crossing alarms to 20 seconds.
<Sysname> system-view
[Sysname] buffer threshold alarm ingress interval 20
Related commands
buffer threshold alarm enable
buffer usage threshold headroom
buffer usage threshold headroom queue
buffer usage threshold queue
buffer usage threshold
Use buffer usage threshold to set the per-interface buffer usage threshold.
Use undo buffer usage threshold to restore the default.
Syntax
buffer usage threshold slot slot-number ratio ratio
undo buffer usage threshold slot slot-number
Default
The per-interface buffer usage threshold is 100%.
Views
System view
Predefined user roles
network-admin
Parameters
slot slot-number: Specifies a card by its slot number.
ratio ratio: Specifies the buffer usage threshold in percentage, in the range of 1 to 100.
Usage guidelines
This command takes effect only when the packet statistics collection mode is queue (configured by using the statistic mode queue command).
After you configure this command, the device automatically records buffer usage for each interface. When a queue on an interface uses more buffer space than the set threshold, the system counts one threshold violation for the queue.
To display the buffer usage statistics for interfaces, use the display buffer usage interface command.
Examples
# Set the per-interface buffer usage threshold to 50% for card 3.
<Sysname> system-view
[Sysname] buffer usage threshold slot 3 ratio 50
Related commands
display buffer usage interface
buffer usage threshold all-queue
Use buffer usage threshold all-queue to set the alarm threshold for all queues.
Use undo buffer usage threshold all-queue to restore the default.
Syntax
buffer egress usage threshold all-queue slot slot-number ratio ratio
undo buffer egress usage threshold all-queue slot slot-number ratio
Default
The alarm threshold is 100% for all queues.
Views
System view
Predefined user roles
network-admin
Parameters
slot slot-number: Specifies a card by its slot number.
ratio ratio: Specifies the alarm threshold in percentage, in the range of 1 to 100.
Usage guidelines
This command takes effect only when threshold-crossing alarms are enabled.
When a queue causes the total buffer usage on the interface to exceed the alarm threshold, the device generates and reports a threshold-crossing alarm to a network management system (such as IMC).
Examples
# Set the alarm threshold to 50% for all queues in slot 1.
<Sysname> system-view
[Sysname] buffer egress usage threshold all-queue slot 1 ratio 50
Related commands
buffer service-pool shared
buffer threshold alarm enable
buffer threshold alarm interval
buffer usage threshold headroom
Use buffer usage threshold headroom to set the global per-queue alarm threshold for the Headroom buffer.
Use undo buffer usage threshold headroom to restore the default.
Syntax
buffer usage threshold headroom slot slot-number ratio ratio
undo buffer usage threshold headroom slot slot-number ratio
Default
The global per-queue alarm threshold for the Headroom buffer is 100%.
Views
System view
Predefined user roles
network-admin
Parameters
slot slot-number: Specifies a card by its slot number.
ratio ratio: Specifies the alarm threshold in percentage, in the range of 1 to 100.
Usage guidelines
This command takes effect only when threshold-crossing alarms are enabled. When a queue exceeds the global alarm threshold for the Headroom buffer, the device generates and reports a threshold-crossing alarm to a network management system (such as IMC).
Examples
# Set the global per-queue alarm threshold to 50% for slot 1.
<Sysname> system-view
[Sysname] buffer usage threshold headroom slot 1 ratio 50
Related commands
buffer threshold alarm enable
buffer usage threshold headroom queue
Use buffer usage threshold headroom queue to set the Headroom buffer alarm threshold for a queue on an interface.
Use undo buffer usage threshold headroom queue to restore the default.
Syntax
buffer usage threshold headroom queue queue-id ratio ratio
undo buffer usage threshold headroom queue queue-id ratio
Default
The global per-queue alarm threshold for the Headroom buffer is used.
Views
Interface view
Predefined user roles
network-admin
Parameters
queue-id: Specifies a queue by its ID in the range of 0 to 7.
ratio ratio: Specifies the alarm threshold in percentage, in the range of 1 to 100.
Usage guidelines
This command takes effect only when threshold-crossing alarms are enabled. When a queue exceeds the alarm threshold, the device generates and reports a threshold-crossing alarm to a network management system (such as IMC).
Examples
# Set the Headroom buffer alarm threshold to 50% for queue 1 on HundredGigE 1/0/1.
<Sysname> system-view
[Sysname] interface hundredgige 1/0/1
[Sysname–HundredGigE1/0/1] buffer usage threshold headroom queue 1 ratio 50
Related commands
buffer threshold alarm enable
buffer usage threshold queue
Use buffer usage threshold queue to set the ingress or egress buffer alarm threshold for a queue on an interface.
Use undo buffer usage threshold queue to restore the default.
Syntax
buffer { egress | ingress } usage threshold queue queue-id ratio ratio
undo buffer { egress | ingress } usage threshold queue queue-id ratio
Default
The global per-queue alarm threshold for the ingress or egress buffer is used.
Views
Interface view
Predefined user roles
network-admin
Parameters
ingress: Specifies the ingress buffer.
egress: Specifies the egress buffer.
queue-id: Specifies a queue by its ID in the range of 0 to 7.
ratio ratio: Specifies the alarm threshold in percentage, in the range of 1 to 100.
Usage guidelines
This command takes effect only when threshold-crossing alarms are enabled. When a queue exceeds the alarm threshold for the ingress or egress buffer, the device generates and reports a threshold-crossing alarm to a network management system (such as IMC).
Examples
# Set the ingress buffer alarm threshold to 50% for queue 1 on HundredGigE 1/0/1.
<Sysname> system-view
[Sysname] interface hundredgige 1/0/1
[Sysname–HundredGigE1/0/1] buffer ingress usage threshold queue 1 ratio 50
Related commands
buffer threshold alarm enable
buffer usage threshold service-pool
Use buffer usage threshold service-pool to set the alarm threshold for a service pool.
Use undo buffer usage threshold service-pool to restore the default.
Syntax
buffer ingress usage threshold service-pool sp-id slot slot-number ratio ratio
undo buffer ingress usage threshold service-pool sp-id slot slot-number ratio
Default
The alarm threshold for a service pool is 100%.
Views
System view
Predefined user roles
network-admin
Parameters
ingress: Specifies the ingress buffer.
service-pool sp-id: Specifies a service pool by its ID. The value range for the sp-id argument is 1 to 3.
slot slot-number: Specifies a card by its slot number.
ratio ratio: Specifies the alarm threshold in percentage, in the range of 1 to 100.
Usage guidelines
This command takes effect only when threshold-crossing alarms are enabled. When the usage of a service pool exceeds the alarm threshold, the device generates and reports a threshold-crossing alarm to a network management system (such as IMC).
Examples
# Set the alarm threshold to 50% for a service pool in slot 1.
<Sysname> system-view
[Sysname] buffer egress usage threshold service-pool 0 slot 1 ratio 50
Related commands
buffer service-pool shared
buffer threshold alarm enable
buffer threshold alarm interval
burst-mode enable
Use burst-mode enable to enable the Burst feature.
Use undo burst-mode enable to disable the Burst feature.
Syntax
burst-mode enable
undo burst-mode enable
Default
The Burst feature is disabled.
Views
System view
Predefined user roles
network-admin
Usage guidelines
The Burst feature is especially useful for reducing packet losses under the following circumstances:
· Broadcast or multicast traffic is intensive, resulting in bursts of traffic.
· Traffic enters a device from a high-speed interface and goes out of a low-speed interface.
· Traffic enters a device from multiple same-rate interfaces and goes out of an interface with the same rate.
Examples
# Enable the Burst feature.
<Sysname> system-view
[Sysname] burst-mode enable
display buffer usage
Use display buffer usage to display buffer usage.
Syntax
display buffer usage [ slot slot-number ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays buffer usage for all cards.
Examples
# Display buffer usage.
<Sysname> display buffer usage
Egress buffer usage on slot 1 :
5sec 1min 5min
---------------------------------------------------
Igress buffer usage on slot 1 :
Egress buffer usage on slot 3 :
Chip0
core0:
Total: 761856 BD
Used: 0 BD
Free: 761856 BD
core1:
Total:1048576 BD
Used: 0 BD
Free:1048576 BD
Chip1
core0:
Total: 761856 BD
Used: 0 BD
Free: 761856 BD
core1:
Total:1048576 BD
Used: 0 BD
Free:1048576 BD
5sec 1min 5min
---------------------------------------------------
FGE3/0/1
Que 0 0% 0% 0%
Que 1 0% 0% 0%
Que 2 0% 0% 0%
Que 3 0% 0% 0%
Que 4 0% 0% 0%
Que 5 0% 0% 0%
Que 6 0% 0% 0%
Que 7 0% 0% 0%
…
Table 1 Command output
|
Field |
Description |
|
Total |
Total buffer size in BD. Each BD is 1024 KB. |
|
Used |
Used buffer size in BD. Each BD is 1024 KB. |
|
Free |
Free buffer size in BD. Each BD is 1024 KB. |
|
Que |
Queue ID. |
display buffer usage interface
Use display buffer usage interface to display buffer usage statistics for interfaces.
Syntax
display buffer usage interface [ interface-type [ interface-number ] ] [ verbose ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
interface-type [ interface-number ]: Specifies an interface by its type and number. If you do not specify the interface-type argument, this command displays buffer usage statistics for all Ethernet interfaces. If you specify the interface-type argument without the interface-number argument, this command displays buffer usage statistics for all Ethernet interfaces of the specified type.
verbose: Displays detailed buffer usage statistics. If you do not specify this keyword, the command displays brief buffer usage statistics.
Examples
# Display brief buffer usage statistics for HundredGigE 1/0/1.
<Sysname> display buffer usage interface hundredgige 1/0/1
Interface QueueID Total Used Threshold(%) Violations
--------------------------------------------------------------------------------
FGE3/0/33 0 761856 0 100 0
1 761856 0 100 0
2 761856 0 100 0
3 761856 0 100 0
4 761856 0 100 0
5 761856 0 100 0
6 761856 0 100 0
7 761856 0 100 0
Table 2 Command output
|
Field |
Description |
|
Total |
Data buffer size in bytes allowed for a queue. |
|
Used |
Data buffer size in bytes that has been used by a queue. |
|
Threshold(%) |
Buffer usage threshold for a queue. The threshold value is the same as the per-interface threshold value. |
|
Violations |
Number of threshold violations for a queue. The value of this field is reset upon a device reboot. |
# Display detailed buffer usage statistics for HundredGigE 1/0/1.
[Sysname] display buffer usage interface hundredgige 1/0/1 verbose
HGE1/0/1
Ingress:
QueueID: 0
Total: -- Used: -- Threshold(%): --
Violations: -- Shared: 0 Headroom: 2000
XoffThres: 0 IsDynamic: 0
Used(%): 0 Free: 766432 UsedPeak: 0
HeadroomUsed(%): 0 HeadroomFree: 2000 HeadroomPeak: 0
…
QueueID: 7
Total: -- Used: -- Threshold(%): --
Violations: -- Shared: 0 Headroom: 2000
XoffThres: 0 IsDynamic: 0
Used(%): 0 Free: 766432 UsedPeak: 0
HeadroomUsed(%): 0 HeadroomFree: 2000 HeadroomPeak: 0
Egress:
QueueID: 0
Total: 761856 Used: 0 Threshold(%): 100
Violations: 0 TailDropThres: 761856 IsDynamic: 1
DeadlockCount: 0 DeadlockRecover: 0
Used(%): 0 Free: 761856 UsedPeak: 0
…
QueueID: 7
Total: 761856 Used: 0 Threshold(%): 100
Violations: 0 TailDropThres: 761856 IsDynamic: 1
DeadlockCount: 0 DeadlockRecover: 0
Used(%): 0 Free: 761856 UsedPeak: 0
Table 3 Command output
|
Field |
Description |
|
Ingress |
Usage statistics for the ingress buffer. |
|
Egress |
Usage statistics for the egress buffer. |
|
Total |
Data buffer size allowed for a queue, in the number of cell resources. |
|
Used |
Data buffer size that has been used by a queue, in the number of cell resources.
|
|
Threshold(%) |
Buffer usage threshold for a queue. The threshold value is the same as the per-interface threshold value. |
|
Violations |
Number of threshold violations for a queue. The value of this field is reset upon a device reboot. |
|
Shared |
Number of cell resources in the shared area used by a queue. |
|
Headroom |
Number of cell resources in the Headroom area used by a queue. When a queue on an interface enabled with PFC enters PFC XOFF state, the interface sends XOFF frames to notify the peer interface to stop sending packets to that queue. Packets sent by the peer interface before it receives XOFF frames are stored in the Headroom area. |
|
XoffThres |
Back pressure frame triggering threshold. If a dynamic back pressure frame triggering threshold is configured, this field displays a percentage value. If a static back pressure frame triggering threshold is configured, this field displays an absolute value. |
|
TailDropThres |
Tail drop threshold. |
|
IsDynamic |
For the inbound direction, this field can be one of the following values: · 0—Indicates a static back pressure frame triggering threshold. · 1—Indicates a dynamic back pressure frame triggering threshold. For the outbound direction, this field can only be 1, which indicates a dynamic tail drop threshold. |
|
Used(%) |
Buffer usage in percentage. |
|
Free |
Free buffer in the number of cell resources. |
|
UsedPeak |
Peak used buffer in the number of cell resources during the time between two executions of the display buffer usage interface command. |
|
HeadroomUsed(%) |
Headroom area usage in percentage for the ingress buffer. |
|
HeadroomFree |
Free Headroom area in the number of cell resourcesfor the ingress buffer. |
|
HeadroomPeak |
Peak used Headroom area in the number of cell resourcesduring the time between two executions of the display buffer usage interface command. |
|
DeadlockCount |
Number of times the device entered the PFC deadlock state in the egress buffer. |
|
DeadlockRecover |
Number of times the device released the PFC deadlock state in the egress buffer. |
|
|
NOTE: For more information about back pressure frame triggering thresholds and PFC deadlock, see Ethernet interface configuration in Layer 2—LAN Switching Configuration Guide. |
