Do we need routers aslo for communications between VLANs.

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Do we need routers aslo for communications between VLANs.


Re: Do we need routers aslo for communications between VLANs.
Communication between VLANs is only possible with a router or a Layer 3
switch (technicaly is a L3 switch a router). So the answer to you're
question is: yes, you need a router.

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Re: Do we need routers aslo for communications between VLANs.
lrantisi@gmail.com wrote:
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No, a router is not necessary for communication between VLANs.

However, some connection between the VLANs would be needed. A crossover
cable, for instance.

Other requirements would may to be met as well. For IP, the address and
subnet mask of communicating endpoints would have to be configured
properly to allow communication. For other protocols, such as DECnet or
LAT, no special software configuration would be needed.

If the question you're asking is "do I need a router to connect the
most commonly occurring instances of VLANs, such as those in an office
or home, running IP with different subnets on each VLAN", then the
answer is "yes, you need a router".


Re: Do we need routers aslo for communications between VLANs.
vlans separate broadcast domains while switches separate collision
domains. for a vlan, you definitely need a router, a must, because a
vlan is a separate broadcast domain but note that vlan1 is the
administrative vlan and could be implemented in a switch or router,
depends on your requirements.
erik.freitag@pobox.com wrote:
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Re: Do we need routers aslo for communications between VLANs.
In addition:

Make sure the normal users are never in VLAN1 and make sure they can't
access VLAN1. VLAN1 is the Managment VLAN and should be use to address
switches and other network stuff. Only administrators should be able to
access this VLAN.

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Re: Do we need routers aslo for communications between VLANs.
imagine u are in a country and each state has its state code for
regional phones while there is an international code for long distance
international calls. VLAN1 makes interstate communication possible
(each state has a separate VLAN ID) while your router makes
international calls possible, your IP address. A router could
accomplish both functions but if you going to have so many VLANs and
hosts, as in a corporate setup and if latency is important to you, make
a switch the VLAN1 and a router stands at the bottom of the hierarchy
to router packets. it's just like tagging, really.

CCNA Nerd wrote:
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Re: Do we need routers aslo for communications between VLANs.

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From more and more people lately I'm hearing that it's best practice to NOT
use VLAN 1 for management.  The management VLAN can have any identity you
want and moving away from #1 makes it more discrete.  Also, all unconfigured
port default to VLAN 1 so you move the management VLAN to another number to
reduce the risk of an access port being in that VLAN.

BernieM



Re: Do we need routers aslo for communications between VLANs.

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Yes, it seems VLAN 1 is only retained for CDP and VTP these days according
to the experts in the field.

Aubrey



Re: Do we need routers aslo for communications between VLANs.

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And it's not even necessary then.  We created a seperate vlan for all
layer-2 protocol conectivity (switchport native vlan) and don't even trunk
vlan 1.  Granted some of our older switches (3500XL) won't alllow vlan 1 to
be removed from trunk links but the'ye being replaced this fin year.

BernieM



Re: Do we need routers aslo for communications between VLANs.
you'll realise how important VLAN1 is you start having unauthorized
users having access to files in other computers which they are not
supposed to have access to. if you're not going to implement VLAN1 or
let's say an administrative VLAN, then the reason behind virtual
security is defeated.
BernieM wrote:
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Re: Do we need routers aslo for communications between VLANs.

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I do support an administrative vlan ... away from vlan 1 ... which is best
practice.  VLAN 1 is nothing 'special'.  Please explain your post.  How does
not using vlan 1 make it more possible for users to gain access to files in
other computers?

BernieM



Re: Do we need routers aslo for communications between VLANs.
your administrative VLAN could be implemented in a switch or router,
there's no gainsaying. if you don't use an administrative vlan, then
you're not segmenting the hosts and that makes it just one whole node
for all your hosts. one node for all your hosts means if a user needs
to access another host on that node, the frames are forwarded to all
the hosts if the host is not on the switch's/router's table for that
node else it just forwards it instantly if the MAC is in its table.

how can a host communicate with another host?

simple. by programming. u could initiate file sharing by forwarding
programmes.
thanks
BernieM wrote:
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Re: Do we need routers aslo for communications between VLANs.
whatever

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