TomS_
debugger it
Premium,MVM
join:2002-07-19
Australia
edit:
May 7th, @09:05PM
| reply to aryoba
Re: Cisco Vs FastIron
said by aryoba  :I wonder what the reason is behind having so many VLAN (4000+ VLAN). As a good practice and a good network design, I usually do more of non-VLAN routing whenever possible. Youre not serious are you?!?!!?
VLANs are the most useful invention in the networking world. Clearly you dont appreciate their value because you dont use them frequently enough. 
Consider the following scenario:
A large ISP in down town New York has 1000 customers hanging off a single router.
Without VLANs that ISP needs a router with 1000 individual physical interfaces to service each customer.
With VLANs, that ISP needs a router with a single interface, and for each customer they create a subinterface in a particular VLAN. Those VLANs can then be trunked from switch to switch all over New York, and indeed the world, and pop out at a switch port anywhere the ISP or customer needs or wants it to.
You cant tell me that not using VLANs is good practice or even good network design......
Not to mention Q-in-Q, which allows you to trunk a further 4094 VLANs through each of the original 4094 VLANs, allowing you to effectively run 16.7 million VLANs on a single network. |
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aryoba
Premium,MVM
join:2002-08-22
| said by TomS_ :said by aryoba :I wonder what the reason is behind having so many VLAN (4000+ VLAN). As a good practice and a good network design, I usually do more of non-VLAN routing whenever possible. Youre not serious are you?!?!!? I'm dead serious.
You should see the reason once you read on ....
said by TomS_ :VLANs are the most useful invention in the networking world. Clearly you dont appreciate their value because you dont use them frequently enough. I'm not sure about the most useful invention aspect. However I'm sure I use VLAN frequently enough to say my previous comment.
said by TomS_ :Consider the following scenario: A large ISP in down town New York has 1000 customers hanging off a single router. In case like this, then yes; the single router (or the single 3750 switch in some ISP network) terminates 1000+ VLAN.
I'm guessing that kracksmith network design requirement is coming from a corporate. I also understand that you TomS_ comes from ISP network. Allow me to make a note that each network requires different network design.
Since this thread should be about corporate network design requirement, then my statement above may only suit such and not ISP network design requirement. |
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luminaire
Premium
join:2005-03-22
Oakville, ON
clubs:
| I was going to pipe up about the VLAN comment, but I figured my service provider opinions don't represent the majority. I guess someone else brought it forward anyway.
--
Luminaire
My Blog |
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TomS_
debugger it
Premium,MVM
join:2002-07-19
Australia
| reply to aryoba
said by aryoba :You should see the reason once you read on .... I still dont see youre point.
But thats all I'll say, otherwise I'll just be hijacking this thread. |
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bky
Premium
join:2002-07-05
Austin, TX
 ·AT&T U-Verse
| reply to aryoba
said by aryoba :Since this thread should be about corporate network design requirement, then my statement above may only suit such and not ISP network design requirement. Smaller network environments benefit from vlan segmentation just as much as a service provider would for security, scalability, compliance, and management. May not be as many as the service provider would have, but definitely good practice. |
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sporkme
drop the crantini and move it, sister
Premium,MVM
join:2000-07-01
Budd Lake, NJ
 ·Optimum Online
| said by bky :Smaller network environments benefit from vlan segmentation just as much as a service provider would for security, scalability, compliance, and management. May not be as many as the service provider would have, but definitely good practice. Just curious, in your typical corporate environment, at what point does it pay to start throwing groups (floors, departments, whatever) into their own VLAN and subnet? I would imagine that the further you partition things, the easier troubleshooting becomes. Way back when this was not easy since crossing a subnet boundary meant going through a router that was a bottleneck, but I'm assuming these days with wire-speed layer 3 switches that bottleneck is gone.
I imagine if I were dropping 5 figures or more on L3 switches, I'd partition the hell out of things. |
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