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| I'm up for a job interview soon, hopefully. On the job spec, one key area says that the I should understand the different IOSs around and why it is important to have those different 'trains' (as they call it) in their network environment.
This a role with a BIG ISP and I don't understand why it would be important to have different IOS revisions. Doesn't it make sense to have the same revision level across similar platforms.
Anyone know this?
TIA
Hippo
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| http://www.cisco.com/en/US/products...
18305e.shtml#2
I suspect it has to do with reverting to old working condition in failed upgrade/issues... dunno, I don't work in that structured of an environment.. but ya, in general, benefit of uniformity of versions and the ease/error proof administration of it outweight any benefit of not having all your devices compromised by any single vulnearbility... | |
| nethead 2003-11-11, 8:10 am |
| One reason could be to protect the network against bugs and vunerabilities. So if you had the routers running different versions of IOS (say 2) then if there turned out to be a bug identified then it wouldn't affect all of the network. Also a virus could be written which exploits a vunerability in a particular train of IOS - by having different versions the virus couldn't take down the whole network.
Also not all routers need to run the same feature set depending on what they are being used for. | |
| Demijohn 2003-11-11, 9:36 am |
| More reasons:
The resources in all routers are limited. Why waste memory storing code for features you can't or won't use.?
There are dozens of versions of IOS tailored to specific platforms.
Also, as a large ISP, you wouldn't want to roll all your routers to a new IOS version at the same time.
You might want to introduce new features to selected customers before offering them to everyone. | |
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| Thanks everyone; kinda makes sense now.
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