North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Initial Route Server Stats for MAE-East
by all means, ping all you like. please do realize that routers have other things to do besides answer pings when they're busy. just because a router doesn't respond to 15% of its pings doesn't mean that it's dropping 15% of its packets or that there is a 15% loss on a line. router load is not router load, process switched packets are not the same as card-level switched or cache switched. there aren't any easy answers. perhaps we should all just implement "ping" servers in pops ( a 386 running linux or bsd might suffice). Jeff Young [email protected] > > > > > On Sat, 21 Oct 1995, Mike O'Dell wrote: > > > > > remember that using pings to sample connectivity to a very busy > > > cisco router is not a very reliable probe for several reasons. > > > Returning pings is a low-priority task in the first place, and > > > they are rate-limited, so if the processor is busy processing > > > lots of BGP updates and several folks are fribbling with it > > > using ping or SNMP, it is less than clear what they will see. > > > > > > -mo > > > > Michael A. Nasto quips: > > > OK! Agreed. So then, what would you use? > > > > Have you ever been in a classroom and had a student raise his hand, > answer every question, ask intelligent questions, etc. just to prove > to the class how smart he or she is. This is the premise of > the 'Two Mike's Interchange' above. One says, HEY! I know ping packets > are a lower priority than everything else in a *CISCO* router > LOOK AT ME (wave wave). Then another kid in the class quips... > if PING is not what you would use, give us a better utility. > > In fact... EVERYONE ( okay 99.73 percent :-) uses PING. After all > router LOAD is router LOAD.... and if a few ICMP packets can't get > back in a subjectly reasonable time.. then DUH.... "da network > is busy......" BGP updates take bandwidth just like any other packet. > > Of course the 0.27 percent, zen routing gods of the universe just > feel the load and the harmonic BGP update patterns and PING between > the BGP updates.... for a better answer. > > Sorry, I could not resist.... and apologize for the satire. PING!! > PING!! PING!! > > Tim > > -- > +--------------------------------------------------------------------------+ > | Tim Bass | #include<campfire.h> | > | Principal Network Systems Engineer | for(beer=100;beer>1;beer++){ | > | The Silk Road Group, Ltd. | take_one_down(); | > | | pass_it_around(); | > | http://www.silkroad.com/ | } | > | | back_to_work(); /*never reached */ | > +--------------------------------------------------------------------------+
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