Ethernet LAN VLAN Aggregation

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Subject Author Date
VLAN Aggregation vicky 07-04-08
---> Re: VLAN Aggregation Albert Manfredi07-04-08
Posted by vicky on July 4, 2008, 8:21 am
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Hello

I 've a query related on the topic VLAN Aggregation is in my
shared web file folder

named as : VLAN Aggregator.txt

I m giving u my web shared file link


http://vikrantpandey.diinoweb.com/files/


please give some of your time for watching my query and
plz reply .


Thanks in advance


Vikrant

Posted by Albert Manfredi on July 4, 2008, 4:47 pm
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> Hello
>
> =A0 =A0 =A0 =A0 I 've a query related on the topic =A0VLAN Aggregation =
=A0is in my
> shared web file folder
>
> =A0 =A0 =A0 =A0 =A0 named as =A0: =A0 VLAN Aggregator.txt
>
> =A0 =A0 =A0 =A0 I m giving u my web shared file link
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0http://vikrantpandey.diinoweb.com/file=
s/
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 please give some of your time for watching my=
query =A0and
> plz reply .

In RFC 3069, Table 2, followed by Section 6, are what really matters.

It's obvious that you can aggregate IP addressed among LANs. You do
this anytime you connect two Ethernet hosts to an Ethernet layer 2
switch (i.e. bridge), and assign those two to the same IP subnet. So
it should be clear that the same can be done between VLANs.

RFC 3069 says that implementation details are not considered in the
RFC. Seems to me, you can create a single spanning tree, then use IP
addresses to determine who the various members are in each VLAN. This
is a valid way to create VLANs.

Also, pay attention to this text in Section 6:

"That is, when an address or range of addresses is allocated to a
given sub-VLAN, reception of IP or ARP packets on a sub-VLAN with a
source IP address that isn't allocated to the sub-VLAN should be
discarded, ..."

So, the way I'd set this up, a single broadcast domain, and only IP
addresses used to differentiate between VLANs.

Bert

Posted by vicky on July 5, 2008, 2:10 am
Please log in for more thread options
>
> > Hello
>
> > =A0 =A0 =A0 =A0 I 've a query related on the topic =A0VLAN Aggregation =
=A0is in my
> > shared web file folder
>
> > =A0 =A0 =A0 =A0 =A0 named as =A0: =A0 VLAN Aggregator.txt
>
> > =A0 =A0 =A0 =A0 I m giving u my web shared file link
>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0http://vikrantpandey.diinoweb.com/fi=
les/
>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 please give some of your time for watching =
my query =A0and
> > plz reply .
>
> In RFC 3069, Table 2, followed by Section 6, are what really matters.
>
> It's obvious that you can aggregate IP addressed among LANs. You do
> this anytime you connect two Ethernet hosts to an Ethernet layer 2
> switch (i.e. bridge), and assign those two to the same IP subnet. So
> it should be clear that the same can be done between VLANs.
>
> RFC 3069 says that implementation details are not considered in the
> RFC. Seems to me, you can create a single spanning tree, then use IP
> addresses to determine who the various members are in each VLAN. This
> is a valid way to create VLANs.
>
> Also, pay attention to this text in Section 6:
>
> "That is, when an address or range of addresses is allocated to a
> given sub-VLAN, reception of IP or ARP packets on a sub-VLAN with a
> source IP address that isn't allocated to the sub-VLAN should be
> discarded, ..."
>
> So, the way I'd set this up, a single broadcast domain, and only IP
> addresses used to differentiate between VLANs.
>
> Bert

---------------------------------------------------------------------------=
------------------


Hello Sir


as u write

Seems to me, you can create a single spanning tree,
then use IP
addresses to determine who the various members are in
each VLAN. This
is a valid way to create VLANs.


can u plz define how by creating a single spanning tree , and using IP
address to determine who the various members are in each vlan.


Vikrant


Posted by Albert Manfredi on July 5, 2008, 4:09 pm
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> =A0 =A0 =A0 =A0 =A0 =A0 as u write
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Seems to me, you can create a single s=
panning tree,
> then use IP
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0addresses to determine who the various=
members are in
> each VLAN. This
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0is a valid way to create VLANs.
>
> can u plz define how by creating a single spanning tree , and using IP
> address to determine who the various members are in each vlan.

We've been throught this, haven't we? A single spanning tree can be
used in 802.1Q VLANs. It might not be the most efficient tree for each
of the VLANs, but it has to work. After all, the spanning tree does
join together all of the switches in the mesh, with no loops. So the
edge ports of any switch can be made to belong to any VLAN defined in
that mesh.

Bert

Posted by Albert Manfredi on July 5, 2008, 4:11 pm
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> We've been throught this, haven't we? A single spanning tree can be
> used in 802.1Q VLANs. It might not be the most efficient tree for each
> of the VLANs, but it has to work. After all, the spanning tree does
> join together all of the switches in the mesh, with no loops. So the
> edge ports of any switch can be made to belong to any VLAN defined in
> that mesh.

I should have added, of course, that if this is true with 802.1Q, why
should it not also apply to other types of VLANs?

Bert

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