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Determine bw for VLAN
I am using a NetFlow collector. I have set up IP groups to determine how much bandwidth vlan 2 is using.
My question is to accurately determine how much bw a vlan is using do I need to total up the speed that each interface particapting in that vlan is set to?
example:
3 100 meg interfaces in vlan 2 = 300000000 bps
vlan 2 bandwidth capaicty is 300000000 bps.
Would this be correct?
My question is to accurately determine how much bw a vlan is using do I need to total up the speed that each interface particapting in that vlan is set to?
example:
3 100 meg interfaces in vlan 2 = 300000000 bps
vlan 2 bandwidth capaicty is 300000000 bps.
Would this be correct?
just trying to keep it all in perspective!
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rossonieri#1
Member Posts: 799 ■■■□□□□□□□
hi larkspur,
if you are talking about theoritically full rate data transfer - then yes its about 3x100Meg in VLAN2.
but we use a multiplexing/compression ratio - not all your 3 interfaces talk in the sametime - using the same protocol (different protocol utilize different speed etc), cabling distance, electricity and so on.
cheers.the More I know, that is more and More I dont know. -
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Paul Boz
Member Posts: 2,620 ■■■■■■■■□□
It depends more on the bandwidth of your trunk links than anything else. If you have 3 100mb vlan ports that are trunked with a 100mb port and have to send packets across that trunk link your capacity drops down to 100mb. You can't shove 10 pounds of sausage into a 3 pound casing, after all.CCNP | CCIP | CCDP | CCNA, CCDA
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Blog: http://www.infosiege.net/ -
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larkspur
Member Posts: 235
this is my bad for not providing better info.
core swicth (6509)
trunk links to access\distribution swicthes (3750g's)
trunk link speed is 1 gig.
So there are 3 1 gig trunk links to the 3750's which particpate in vlan 2.
so the total bandwidth for vlan 2 would be 3 gig or 3000000000 bps and not the combined port speed of all interfaces ( server etc..) particapting in vlan2 ?just trying to keep it all in perspective! -
Optionsrossonieri#1
Member Posts: 799 ■■■□□□□□□□
larkspur wrote:this is my bad for not providing better info.
core swicth (6509)
trunk links to access\distribution swicthes (3750g's)
trunk link speed is 1 gig.
So there are 3 1 gig trunk links to the 3750's which particpate in vlan 2.
so the total bandwidth for vlan 2 would be 3 gig or 3000000000 bps and not the combined port speed of all interfaces ( server etc..) particapting in vlan2 ?
yes - i wished i know about trunk lines more better.
the global def about trunk line is a line (either single nor aggregrate) which carries multiple line.
the main line - is that the carried line BW will never exceed the trunks.
does a cat6500 single 1 gig port will carry a cat2900 24x100meg on their trunk?
the answer is very clear.
cheers.
HTH.the More I know, that is more and More I dont know.