Question on configuring “carrier-delay” on LAN interface

December 25, 2007 @ 12:09 pm · Filed under CCIE Study

Pandi,
Also if you already didn’t configure P2P, make sure you configure both A-B P2P so the DIS election is canceled, hence will speed up the recovering, you are heading on the right direction on tweaking the Hello-interval. I am not sure if configuring carrier-delay will do any good. Is this production? You can look up fast-flooding command, or BFD if convergence is an issue.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s27/fstfld.htm
Thanks,
Liban Mohamed NTAC-IP Sprint/Nextel www.sprint.net liban.mohamed@sprint.com (W) 678-291-3438 (PCS) 404-441-9701

—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of PANDI MOORTHY Sent: Tuesday, December 25, 2007 11:01 AM To: Cisco certification Subject: Question on configuring “carrier-delay” on LAN interface
Hi,

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