Actually there are several questions here. You're absolutely correct in the answer to
the first:
> There are two subnets in a Vlan. Do we need a router
> to interconnect these two subnets?
YES!
> In addtion to that, can more than one vlan exist on a
> subnet?
NO, the router would not know how to chose which VLAN to forward
IP packets to based on address.
> if so, do we still need a router to interconnect
> different vlans even if there are in a same subnet?
NOT POSSIBLE.
Sorry guys but I knew the answer and I got confused by what was said so I tried to
summarize. Please fill in if I've missed something.
Steve Brokaw, MCSE CCNA A+
Sprint ENS
------Original Message------
From: "Kent Hundley" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED], 'Walker Traylor' <[EMAIL PROTECTED]>,
[EMAIL PROTECTED]
Sent: July 21, 2000 7:28:54 PM GMT
Subject: RE: subnet vs. Vlan
Your correct that the "only thing you need to do to make another subnet work
on a VLAN is a secondary IP on the router". By doing this you are allowing
the router to forward packets between devices on the separate subnets. i.e.
you need the router to perform inter-subnet forwarding, which is what the
original question was.
Without configuring secondaries on the router, the router cannot forward
between the 2 different subnets and the devices on the respective subnets
cannot talk to one another. The original question was whether devices on
the same VLAN can talk to each other without a router if their IP addresses
are in different subnets, and the answer is no. You have to appropriately
configure the router with secondary IP addresses to allow it to forward
packets between the subnets.
-Kent
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
[EMAIL PROTECTED]
Sent: Friday, July 21, 2000 9:13 AM
To: Walker Traylor
Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: subnet vs. Vlan
I beg to differ on this one. I'm currently dealing with a network that has
4 VLANs. Two of those VLANs use multiple subnets. the only thing you need
to do to make another subnet work on a VLAN is a secondary IP on the router
interface for that VLAN. Remember - VLANs are layer 2 (MAC address), not
Layer 3 (IP address). The only entity that cares what subnet a node belongs
to is the router.
Karen E Young
Network Engineer
ELF Technologies, Inc
[EMAIL PROTECTED]
Desk: 206-770-4035
Pager: 206-994-4514
Walker
Traylor To: [EMAIL PROTECTED]
<wtraylor@cis cc:
co.com> Subject: Re: subnet vs. Vlan
Sent by:
nobody@groups
tudy.com
07/20/00
04:20 PM
Please
respond to
Walker
Traylor
You must use a router between any networks, even if they are on the same
VLAN. You do not need a router to merely connect VLANS if they are on
the same network. However, you could just make them just one VLAN in
that case.
--Walker
jeongwoo park wrote:
>
> HI all
> I have a question.
> Cisco recommends that there be one-to-one relationship
> between ip subnets and Vlans.
> When the number of devices on a Vlan exceeds the
> number of host ip addresses per configured subnet,
> more than one subnet can exit on a Vlan.
> Having said that, my question;
> There are two subnets in a Vlan. Do we need a router
> to interconnect these two subnets?
> I know that we need a router to interconnect two
> different Vlans.
> In addtion to that, can more than one vlan exist on a
> subnet?
> if so, do we still need a router to interconnect
> different vlans even if there are in a same subnet?
>
> thanks
>
> jeongwoo
>
> __________________________________________________
> Do You Yahoo!?
> Get Yahoo! Mail - Free email you can access from anywhere!
> http://mail.yahoo.com/
>
> ___________________________________
> UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> FAQ, list archives, and subscription info: http://www.groupstudy.com
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> ---
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
