udld间隔
Syntax
udld间隔no udld intervalDescription
Sets the packet transmission interval.
Thenoform of this command sets the packet transmission interval to the default value of 7000 ms.
The allowed values vary depending on the operation mode.
The default interval is 7000 ms (7 seconds) for both ArubaOS-Switch and RFC5171 operation modes.
Values must be specified as multiples of 10 ms (7000 ms is allowed but 7005 ms is not a valid setting).
ArubaOS-Switch mode can be configured to support under 100ms (8325) unidirectional link detection times.
For example, for an 8325 switch to achieve 60ms failure detection times, interval can be set to 20ms and retries to 3.
Sessions under 100ms total detection time are susceptible to increasing processing load on the system. It is advisable to experiment with values that provide adequate detection times and system/protocol stability. Aruba recommends additional testing prior to configuring these sessions on a production environment.
However, these settings are recommended for specific deployments only, such as using UDLD for Ethernet Ring Protection Switching (ERPS) link-failure detection. The minimum detection time appropriate for your environment depends on the specific device family and configuration on which the protocol and system load is running. Aruba recommends additional testing for these configurations. During testing, monitor for unexpected false positive detections (i.e., UDLD records a failure when there was not any) on the interfaces running UDLD. Such false positive failures are an indication that the interval configuration requires tuning and that the system load might not allow such configuration.
The following table shows the fastest failure detection times that have been tested as a function of the UDLD enabled links. More UDLD links increase the processing load on the system and hence require higher interval values. Setting the interval to a lower value than recommended following might cause unexpected false positive detections. The values on this table are the unidimensional tested limits.
The values provided focus on the scalability of UDLD. The links column is the number of interfaces where UDLD is enabled given as a range. The interval column is the minimum interval value recommended for that scale. The detection time column is the total detection time that is achieved with those settings. For more than 16 links, the interval must be set to 200ms or higher.
| Links | Interval | Retries | Detection Time |
|---|---|---|---|
| 1-4 | 20ms | 3 | 60ms |
| 5-8 | 40ms | 3 | 120ms |
| 9-16 | 80ms | 3 | 240ms |
| 16+ | 200ms | 3 | 600ms |
When configuring detection times under 100ms for LAG interfaces, consider adding the interface first to the LAG and then enabling UDLD in the interface, to avoid false positive link failure detections. Adding an interface to a LAG causes momentary control plane traffic interruption for up to 100ms, which UDLD detects as a link failure if the detection time is following the control traffic interruption interval.
Command context
config-if
Parameters
-
-
Specifies the packet transmission interval. Range: 200 ms to 90000 ms (in increments of 10).
Authority
Administrators or local user group members with execution rights for this command.
Examples
On the 6400 Switch Series, interface identification differs.
设置数据包传输强度rval to1000ms on interface1/1/1.
switch(config)#interface 1/1/1switch(config-if)#udld间隔1000
设置数据包传输强度rval on interface1/1/1to the default value.
switch(config)#interface 1/1/1switch(config-if)#no udld interval
Trying to set the packet interval to 1055 ms on interface 1 is rejected because the interval must be specified as a multiple of 10:
switch(config)#interface 1switch(config-if)#udld间隔1055Invalid interval. The interval value must be between 20ms and 90000ms and should be specified as a multiple of 10, for example: 20, 100, 3000 or 90000.
Trying to set the packet interval to less than 7000 ms on interface 1 is rejected if using the RFC5171 mode.
switch(config)#interface 1switch(config-if)#udld mode rfc5171 normalswitch(config-if)#udld间隔500Invalid interval. The interval must be equal or greater than 7000ms.