21 posts • joined Friday 11th July 2008 06:09 GMT
Been saying it for years - Cisco is going to lose the switching market, and probably the routing market after that.
I see them being relevant in corporate IT (Voice, user access) and servers (I'm guessing that their switching market share will collapse into the embedded switches they're building into UCS chassis).
I'm not 100% sure that home grown devices are mature enough right now for the regular DC. However from an OS perspective, Cumulus Networks should change this in the coming years, and hopefully a larger install base of Trident I / II based boxes will also level the playing field.
Interesting times ahead, and not even one mention of SDN (d'oh!)
What I'd really like to see is event correlation in an intelligent way...
By parsing flow data in almost-real time, looking for patterns in syslog, interface changes (ie: flap, or an interface counter going +/- X% across samples), and snarfing up accounting data. Hell, even take an iBGP feed of updates from my eBGP peers, and a feed of OSPF LSA's and correlate an event with a specific set of updates. There's so much room for correlation, there's just nothing about that I've found that works for me.
I think overall, we have all the tools we need to do this, but the time needed to integrate them all, make them talk nicely, and set intelligent thresholds, relative thresholds and even a little historical predication based on previous events is just not worth it. Lately, instead of spending time on this, I'm fighting to get nfsen/observium/smokeping/homegrown scripts to talk together and give me a coherent view of my traffic patterns.
I'm battling with the stupidity of SNMP traps, SNMP's format and the absurdity of 5 minute samples when I have 40Gbit interfaces.
Monitoring makes me stabby.
Where were your articles when I was in my 20's? I've encountered every type of boss listed. Actually, sometimes, multiple types in the same person.
Excellent article, as always. Look forward to the next.
Why do people need to invent the wheel. The B.A.T.M.A.N protocol exists to solve this exact problem in IPv4, and can be easily ported to IPv6.
Nothing new here....
> Our Future Internet should know no barriers, least of all barriers created because we did not prepare for the data revolution.
Sorry, darlin', speed of light is a constant.
In this case, it's a problem with how WiFi is setup, rather than TCP. WiFi is a shared medium, so you're going to get collisions (CSMA/CA attempts to give fair access to the medium). TCP is affected as it sees a collision as a drop, so it scales back throughput wise. That's why they're dropping new sessions, and giving priority to the existing data flows (It's kinda cheating, throughput wise).
TCP has quite a few throughput hacks in it (Window Scaling, SACK, binary backoff Vs exponential etc), and is quite predictable and mature. The real issue here is wireless ethernet being "non switched", thus having collisions and packet loss with many users.
So it's adaptive, intelligent tail dropping? I dont see what's earth shattering about this.
It's like a bloody soap opera over there on wikipedia.
I suppose this is the end of facebook as we know it.
" In 2008, he attempted to traffic 100 gigabit interface converters that were bought in China"...
100Gbit? If this is not a typo, which dumb ass actually bought this and considered it legit (in 2008)?
RE: Unified communications. Pfaw
>> The reality is that no matter how many lines of communication you offer a given employee, you can't change the fundamental fact that it is their CHOICE to respond or not.
Agree, however you have presence awareness. At least now the boss knows the employee is unable to respond.
Nope, one machine can never live up to that level of service :)
But, say you have a farm of 10 machines behind a load balancer (in fault tolerant mode), with the correct type of probing configured on the load balancers (so that machines which still ping, but say, dont serve out HTTP, are not used for a load balancing decision), 99.999% should be an attainable goal.
You hardly think that MS or Apple use just one machine for these types of services?
I'd say their setup is a little more complicated than that, I'd suspect that they have GSLB in place, to direct you to the nearest (geographically) serverfarm.
Anything less than 99.999% these days is just not acceptable from a corproate entity.
Paris, cause she's had more downtime than Ubuntu's site..
This story is..
Err, mine's the denim one
- It's true, the START MENU is coming BACK to Windows 8, hiss sources
- iSPY: Apple Stores switch on iBeacon phone sniff spy system
- Pic NASA Mars tank Curiosity rolls on old WET PATCH, sighs, sniffs for life signs
- How UK air traffic control system was caught asleep on the job
- Google embiggens its fat vid pipe Chromecast with TEN new supported apps