Comments inline...
Let me know if you have any questions.
HTH,
Karen
*********** REPLY SEPARATOR ***********
On 6/12/2001 at 5:34 AM Amit Gupta wrote:
>Hi All,
>
>The scenario is such that I have 2 subnets configured
>on the LAN. They are x.x.1.0 / 24 and x.x.2.0 / 24.
>The IP address for the Routers ethernet port are
>x.x.1.1 and x.x.2.1. Similarly workstations in either
>subnet point to these addresses ( x.x.1.1 and x.x.2.1
>) as their default gateways.
>I am having Cat 5509 and Cat 6609 ( With MSFC) with
>all the ports in the default VLAN1
KY: If all the ports are in VLAN 1 then you effectively have a single
network with two subnets, a primary (x.x.1.0) and a secondary (x.x.2.0). If
you want to treat it as two networks and do inter-vlan routing then you need
to set up a second VLAN. If you don't want to do that then you need to set
up a secondary address on the router interface (or MSFC) The command is "ip
address x.x.2.1 255.255.255.0 secondary".
>
>I have the following queries on this :
>Config on MSFC
>
>Can the IP addresses of the vlan interfaces be any one
>of the free IP address available on the LAN.
>For eg x.x.1.3
KY: Yes. Only the Network address and the broadcast address are off limits.
All other unused addresses in the subnet are available for workstations,
printers, servers, etc...
>
>What will be the default gateway address configured on
>MSFC in this case ? ( Will it point towards the
>address of the Ethernet interface of the External
>router )
KY: Remember that a default gateway address is simply where you want the
device to send traffic when it doesn't have a more specific route. Ask
yourself "Where should my MSFC card sent traffic not meant for any connected
VLANs?" If the answer is to the external router, then the default gateway
address is the next hop to the router.
>
>On the Switches
>
>Can both switches be configured in the VTP Server mode
>?
KY: Yes. The second server will act as a backup. However, you'll need to
keep a close eye on the VTP revision numbers when making changes since
that's a really good way to mess up your VLAN structure. The best way to add
a new VTP server is to add it as a client until it has the current revision
(the current VLAN structure) and then switch it over to server mode.
>Do the trunk ports have to have an IP address ?
KY: No, on the switch itself (not the MSFC) the only IP address will be on
the management interface (sc0).
>
>DHCP Server
>
>How would I have to define the scopes on the DHCP
>server.
>Suppose I plan to have 1 Vlan configured for 1 subnet
>and 4 VLANs in the second subnet. How to go about it.
>
KY: Set up your scopes as if they were regular networks. The DHCP server
handles the distribution just fine. Just remember that you'll need to
configure IP helper addresses on each VLAN subinterface on the MSFC or
router (whichever device is handling inter-vlan routing). One major problem
I see here is this "4 VLANs in the second subnet". A VLAN is a regular
network that happens to be double-jointed (so to speak). Its more flexible,
but its still a regular network. One subnet per network unless you're using
a secondary address and only one network per subnet. Thats it. If you want
to set up 4 VLANs on the x.x.2.0 subnet then you're going to HAVE to subnet
it further into 4 subnets (x.x.2.0, x.x.2.64, x.x.2.128, and x.x.2.192) with
associated subinterfaces so that inter-vlan routing can occur.
>Thanks in advance for any kind of help/ suggestions
>
>
>
>
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