VLAN clarification

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Hello-I wanted to clear up a point-if different numbered VLANs on the
same switch are configured they still need a router to communicate-even
though they are on the same switch? I understand if the same VLAN is on
different switches they can all communicate without the need for a
Router?
TIA


Re: VLAN clarification

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If they are on a Layer 2 switch, then yes they need a router to communicate.

If they are on a Layer 3 switch, then no they do not need a router to
communicate.

If you have multiple Layer 2 switches and they are trunked together, intra
VLAN communication will happen, ie VLAN 3 on switch 1 can talk to VLAN 3 on
switch 2 but the same as above appplies, they can not talk to other VLAN's
without some type of Layer 3 device.



Re: VLAN clarification

Brian V wrote:
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Many thanks for that- i am on Semester 3 of CCNA and havent really
covered any Layer 3 switches-do you know if its in this course or is it
in CCNP?


Re: VLAN clarification

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One would think it is in there..... 80+% of the switch product line these
days is Layer3 capable switches.



Re: VLAN clarification

gregg johnstone wrote:
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Hi Gregg,

L3 switching is definately covered in the CCNP, particularly the BCMSN
course.

When I took the CCNA around July this year, I didn't learn any L3
topics for the exam and I can't recall any questions on it. Intervlan
routing was carried out by external routers. I'd check the CCNA
blueprint to be sure though.


Re: VLAN clarification

dilan.weerasinghe@gmail.com wrote:
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Thanks guys-will do


Re: VLAN clarification
Brian V wrote:
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They do, but the L3 switch is that router.

P.
--
Paul Matthews                          
paul@cattytown.me.uk
http://www.hepcats.co.uk

Re: VLAN clarification
gregg johnstone wrote:

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That is the whole point of a VLAN - keep things separate.

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Only if someone has fucked up the config.
--
Paul Matthews                          
paul@cattytown.me.uk
http://www.hepcats.co.uk

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