Brocade Network OS Command Reference v4.1.0 - Manual (Page 359)

Network OS Command Reference 321
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hello-interval
2
hello-interval
Sets the interval between PDU packets sent from the ELD-enabled edge ports of a Brocade
VCS Fabric cluster.
Synopsis hello-interval interval
no hello-interval
Operands interval Number of periods between each PDU. For example, a value of 2000
causes a PDU to be sent every two seconds. Valid values range from 100
through 5000 milliseconds (100 ms through 5 seconds).
Defaults 1000 (one second)
Command Modes ELD configuration mode
Description Use this command to set the interval between PDU packets sent from the ELD-enabled edge ports
of a Brocade VCS Fabric cluster.
Usage Guidelines Use this command with the pdu-rx-limit command to determine the time taken to detect a loop.
The time taken to detect a loop is the product of the pdu-rx-limit and the hello interval.
The hello interval must be set to the same value on all Brocade VCS Fabric clusters that have ELD
enabled, otherwise it cannot be predicted which Brocade VCS Fabric cluster will reach its limit first.
The Brocade VCS Fabric cluster in the loop with the lowest pdu-rx-limit is the cluster where the loop
gets broken, assuming that the hello interval is correctly set to the same value on all clusters.
This command applies only in Brocade VCS Fabric mode.
This functionality detects Layer 2 loops only.
Enter no hello-interval to return to the default setting.
CAUTION
Use extreme caution when setting the hello interval value to less than 1 second because it
heavily increases the CPU load due to the number of packets transmitted and received. This load
depends on the number of ELD instances and other system configuration parameters.
Undesirable performance and scalability might occur.
Examples To set the PDU interval to 5 seconds:
switch(config)# protocol edge-loop-detection
switch(config-eld)# hello-interval 5000
To reset the PDU interval to its default value of 1 second:
switch(cfg-eld)# no hello-interval 5000
See Also pdu-rx-limit, protocol edge-loop-detection, show edge-loop-detection globals