> Hi, Hi again, and thanks for the answers. Very appreciated ! I leave the comments in-line. > > Like James, I wrote tools that handle several 10K variables on 5 minute > interval. > > I am not at all trying to discourage you in your project. There are some > concern you should keep in mind: > > Please always remember that the primary role of the network / network > equipment you try to manage is to transport data. > I mean payload data, not management data. Have you estimated/calculated the > ration of the bandwidth you will consume "just" for management? > (You did not mention how many counters per routers you intend to collect data > about.) > Measurement should not bias measured (or only to a minimal extend). Well that should not be a problem, since I have everything simulated in a sever (using mininet and quagga routers). I have a dedicated out of band interface at every device just for snmp and netflow. And currently for snmp I am getting the data from the same machine and storing it in a file (all the devices share the same file system), so its kind of "cheating" but as a first step its what they told me to do. Even with that solution I am having CPU problems due to all these processes polling the counters and writing it to a file every second.
> Switchs and routers are not designed to assist to this extend, the management > station. > SNMP is not the best method (high CPU load, low priority on the equipment) => > How about Netflow ( nfsen is a wonderful free tool , if you accept 5 min. > period) I am already using netflow but for another purpose, and SNMP was only for the counters to know the load at every link in "real time" ( If I manage to accomplish that) > > There is a big difference between what can be done and what make sense to be > done. > > In any way Get-bulk (if several counters par routers) seems more appropriate > than Traps. I can have up to ...20 interfaces per routers. > > There are some questions you should consider and find an answer to: > > How are configured the time-outs and the retries of your SNMP requests (you > intend to address some "real" equipment that may respond with latency) ? > Two seconds time-out and 3 retries don't make really sense when > polling every second. So far I have not consider that, I assume I have some kind of ideal scenario where everything works... and everything its "under my control", like my simulation or a data center. > Impact of a "non-responding" device? (a faulty one, defectuous one), of > several faulty devices (let say 10). What happens to the 190 others? > What is the latency of the network that interconnect your 200 routers? The latency should be very small, 1) because I am using the out of band network to monitor, 2) and my idea is to loadbalance in datacenter networks. > How do you "time-stamp" the collected data ? I don't, I assume that all the data from the routers is from the same period of "sampling". I don't really know what to do, I need to know the load per link as fast as possible so I can improve the load balancing decisions. Thanks a lot, Richard ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Net-snmp-users mailing list Net-snmp-users@lists.sourceforge.net Please see the following page to unsubscribe or change other options: https://lists.sourceforge.net/lists/listinfo/net-snmp-users
