How much bandwidth for management over <10Mbit WAN?

Is there a rule of thumb if you want to manage a router at a remote site with a bandwidth of 10Mb or less?

If you want to keep your remote management traffic from being drowned, you'd probably do some QoS/Shaping, but is there a rule that say that if you have 10 Mb, then 1Mb needs to be reserved for management, and what about smaller bandwith 2 Mb etc....?

What I mean with management is using the CLI/Console/VTY access for troubleshooting purposes, configuration and the occasional upgrade of the IOS.

Find more posts tagged with

Comments

DCD

You should only need about 64kbps.

FrankGuthrie

Are then any rules or best practices about my question?

OctalDump

Consider that the serial console is about 10kbps, you wouldn't need much at all. You could get away with a lot less. A typing speed of 30 words per minute works out at about 300bps. And a lot (like 99%+) is idle time. But you will probably want more than that if you need to upgrade the IOS (ie upload an image over that link).

The point is, that unless you have more specific needs, or are aware of, for example, routing protocol traffic or similar things, it probably isn't worth worrying about.

Top Down Network Design by Priscilla Oppenheimer gives a rule of thumb that management traffic (including routing protocols, polling, STP frames, CDP, SNMP, pings etc etc) should not exceed 5%. So that gives you a ceiling figure.

FrankGuthrie

OctalDump wrote: »

Consider that the serial console is about 10kbps, you wouldn't need much at all. You could get away with a lot less. A typing speed of 30 words per minute works out at about 300bps. And a lot (like 99%+) is idle time. But you will probably want more than that if you need to upgrade the IOS (ie upload an image over that link).

The point is, that unless you have more specific needs, or are aware of, for example, routing protocol traffic or similar things, it probably isn't worth worrying about.

Top Down Network Design by Priscilla Oppenheimer gives a rule of thumb that management traffic (including routing protocols, polling, STP frames, CDP, SNMP, pings etc etc) should not exceed 5%. So that gives you a ceiling figure.

Thanks Octaldump,that is something I can work with.

DCD

As OctalDump said SSH traffic is not going to take much bandwidth you want to prioritize it but not over VOIP traffic. You won't be load a IOS if traffic is congested. For standard routers you would have to restart the router.

FrankGuthrie

DCD wrote: »

As OctalDump said SSH traffic is not going to take much bandwidth you want to prioritize it but not over VOIP traffic. You won't be load a IOS if traffic is congested. For standard routers you would have to restart the router.

Well it would be nice that if the offsite location is quite far, that you won;t have to wait for days before IOS has been copied to the device, if you want to do a upgrade.