Interface downtime in order to initiate DHCP

[liviu.sisu]

Hi guys,

I'm trying to find out what is the minimum downtime for a Cisco 2800 series LAN interface configured as DHCP client, in order to initiate a new DHCP discover.

How much time does it need to take for the Cisco to "sense" the phy disconnection ?

Any help is appreciated.

Liviu Sisu

[John Blakley]

I would figure max about 30 seconds. If it doesn't come up, you can down the interface and bring it back up. Why are you running dhcp on the lan side?

[liviu.sisu]

Hi,

I need to test a scenario where SOHO cisco routers are used, and I need to know if this configuration is changeable or at list visible in the config.

I assume the SOHO routers have the settings alligned with other ones..

[liviu.sisu]

Anyone knows what is the hardcoded value ?

[Peter Paluch]

Liviu,

Have a look at the carrier-delay command:

http://www.cisco.com/en/US/docs/ios/interface/command/reference/ir_c1.html#wp1012657

The default value is 2 seconds. You can modify the setting in order for the interface to take note of the up-down transition sooner. Perhaps this will help.

Best regards,

Peter