Hi all, I have a few question regarding performance routing, specifically to do with the timings, I just need some clarification on a few things.
So I've been labbing up a simple config as follows - R1 connected via 64k Serial and 256K ethernet to R2, and then r3 conencted to R2 via FastEthernet. Now R2 is my OER Border and R3 is my Master (I eventually plan to add a backup master). Now everything has worked, I've setup a few loopbacks on R1, and I've basically said when the ethernet link get's 20% utilised I want to loadshare with the serial connection. My prefixes are learnt, and on the border I can see the controlled routers via the show oer border route command. What I found worrying/questioning was the time it took for the process to 1. learn the prefixes and 2. manipulate the routing table. So my thoughts as follows, please clarify or correct me if I'm off the mark. 1. Prefix learning. When you place the master into learn mode I noted that no prefixes are listed during this time (at first run), I used the learn-interfval and periodic-interval commands to speed up the process. In the real world are there any guidelines on tuning this area? is this the right way of doing it?? I see that 1minute is the minimum you can set it to, but I'm assuming that this adds to the memory/cpu resources. 2. Route population on the border Once I'd learnt the prefix I sent through lot's of data but noted that it took forever for the route to appear. Initially I thought there was a problem, but when reading I noted that the load-interval by default is 1min (i think). So am I right in saying that the master has to wait 1 min for stats from the interface (as it's in passive monitoring mode) before it'll advise the border on route injection, and if so manipulating the load-interval to the min of 30s is the way forward. This then begs the question, in the real world if we use active monitoring (netflow/ip sla) I'm assuming this doesn't have the same drawbacks, and gives us the min 5s time to react that cisco talks about. Look forward to your responses. Bal _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
