Enabling udld, Changing the keepalive interval, Changing the keepalive retries – Brocade TurboIron 24X Series Configuration Guide User Manual
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Brocade TurboIron 24X Series Configuration Guide
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UDLD overview
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To configure UDLD on a trunk group, you must enable and configure the feature on each port
of the group individually. Configuring UDLD on a trunk group primary port enables the feature
on that port only.
•
When UDLD is enabled on a trunk port, trunk threshold is not supported.
•
Dynamic trunking is not supported. If you want to configure a trunk group that contains ports
on which UDLD is enabled, you must remove the UDLD configuration from the ports. After you
create the trunk group, you can re-add the UDLD configuration.
•
If MRP is also enabled on the device, Brocade recommends that you set the MRP
preforwarding time slightly higher than the default of 300 ms; for example, to 400 or 500 ms.
Refer to
“Changing the hello and preforwarding times”
Enabling UDLD
To enable UDLD on a port, enter a command such as the following at the global CONFIG level of the
CLI.
TurboIron(config)#link-keepalive ethernet 1
To enable the feature on a trunk group, enter commands such as the following.
TurboIron(config)#link-keepalive ethernet 1 ethernet 2
TurboIron(config)#link-keepalive ethernet 3 ethernet 4
Syntax: [no] link-keepalive ethernet [portnum] ethernet <portnum>
These commands enable UDLD on ports 1 – 4.
TurboIron(config)#link-keepalive ethernet 1 to 5 ethernet 7
Syntax: [no] link-keepalive ethernet <portlist>
Changing the Keepalive interval
By default, ports enabled for UDLD send a link health-check packet once every 500 ms. You can
change the interval to a value from 1 – 60, where 1 is 100 ms, 2 is 200 ms, and so on. To change
the interval, enter a command such as the following.
TurboIron(config)#link-keepalive interval 3
Syntax: [no] link-keepalive interval <num>
The <num> parameter specifies how often the ports send a UDLD packet. You can specify from 1
– 60, in 100 ms increments. The default is 5 (500 ms).
Changing the Keepalive retries
By default, a port waits one second to receive a health-check reply packet from the port at the
other end of the link. If the port does not receive a reply, the port tries four more times by sending
up to four more health-check packets. If the port still does not receive a reply after the maximum
number of retries, the port goes down.
You can change the maximum number of keepalive attempts to a value from 3 – 64. To change the
maximum number of attempts, enter a command such as the following.
TurboIron(config)#link-keepalive retries 4