Go CCIE Go!! - A Cisco Certified Internetwork Expert

Hi,

Question on configuring “carrier-delay” on LAN interface

I have two router A & B on the same LAN forming ISIS neighbor.

The question is to ensure convergence time is as fast as possible while link down detection is also as fast a possible.

One way to improve the convergence is to set the hello timer to minimal “isis hello-interval minimal ”

To make the link down detection as fast as possible, can I configure the “carrier-delay msec 0″ on the LAN interface? Will it work?

Reading the Cisco documentation, it says this command applicable only to serial interface.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hif_r/int_a1h.htm#wp1199046

But IOS still allow me to configure it on LAN interface

Rack1R2#sh run int fas 0/0
Building configuration…

Current configuration : 104 bytes
!
interface FastEthernet0/0
no ip address
*carrier-delay msec 0*
duplex half
no clns route-cache
end

Rack1R2#

Please advice

Regards
Pandi