Config of 3750 switch across 2 buidlings

Hi there

I am trying to configure 2 Cisco 3750 switches across 2 buildings.

One swtich terminates into a LAN extension and has an IP address of 10.244.15.254 and the other 3750 switch terminates into the other end of the LAN extension but this isn't configured. I would like to give this switch an IP address of 10.244.15.249. The LAN extension is in port 23 on both switches.

I baiscally want the new swtich to use vlan 99 and 110 which are the data vlans. Please see the below config for our exisitng switch.

Can anyone advise how to do this or send me a config?

Thanks
GBMAN3750CORE.TXT
adterry79Asked:
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harbor235Commented:
Configure a dot1q trunk allowing vlans 99 and 110 on the trunk

int g0/23
switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 99,110, X
 switchport mode trunk

do this on both sides, I assumed the vlans are acticve, what vlan is used for management?
Whatever vlan that is that will also have to be trunked so the ip address assigned has logical connectivity to the management vlan.

int vlanX
ip address 10.244.15.249 255.255.255.0

harbor235 ;}
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adterry79Author Commented:
The management range vlan is 99 and I need to allow through this and 100 - data, 110, server and 200 - phones.

How do I physically set the IP address and subnet mask of the new switch so it can at the very least ping itself?

Thanks
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harbor235Commented:

To add the ip address:

int vlan 99
ip address 10.244.15.249 255.255.255.0
exit

You also need to a static route (if no routing protocol is being used) to route traffic
off this segment

ip route 0.0.0.0 0.0.0.0 10.244.15.X (this is the gateway address)

thats it,

To add the other vlans to the trunk here is the trunk config again:


int g0/23
switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 99,100,110, 200
 switchport mode trunk

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adterry79Author Commented:
Will the new switch (10.244.15.149) become a gateway within one building with this config?

Currently (10.244.15.254) is the default gateway in the main building and although I presume that from this config that 10.244.15.254 will reamin the default gateway across the 2 sites it would probably make more sense to have a default gateway in each building?

Maybe i'm talking rubbish so any advice would be welcome.

Thanks
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harbor235Commented:

Yes, keep 10.244.15.254 as the gateway, remember the gateway in this case is only for the management traffic. Any vlans you define on the new switch will have access to the existing layer 2 infrastructure, hence, all you are doing is extended your current layer 2 to the new building, traffic will flow from building 2 to building 1.  


All other vlans will have access to the layer 2 switch mesh, as long as GW addresses were configured previously and spaning-tree is correct for each vlan they will be fine.


-harbor235 ;}
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markmeulemansCommented:
It seems like all you're doing is extending the layer 2 network, and don't really need the ip address on the second 3750, since all the hosts are on the same subnet.  If you're planning putting a different subnet on one of those vlans, then yes, you'll need a different default gateway, but otherwise you won't.

I'm curious though as to why you bought 3750's if they're going to be in separate buildings?  Was it in case you needed the stack capabilities in the future if you needed to expand the network?

Thanks.
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harbor235Commented:

of course you would definitely need the ip address on the new 3750 to manage the switch,
how else would make a config change unless youo were in that building via a console connection or utilizing a access-server?

The question was asked how to use this device utilizing a LAN extension architecture so that is the answer I gave. Of course, a 3750 is a layer 3 switch as well and can do more.

harbor235 ;}
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adterry79Author Commented:
In answer to the question - We will be stacking more switches to this in the near future - we're in the process of moving buildings and moving from a Novell to Microsoft network as well as standardising on a Cisco infrastructure at the same time utilising VoIP phone systems.

One more question quickly for harbor235 - in port 28 of the switch, I have an LC fibre connection to a 2960g 48 prt switch. What do I need to do to configure these devices to speak to each other. This time, I only need vlans 99 and 110 to work and the LC will be plugged into port 48 on the 2960g.

Thanks again
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Feroz AhmedSenior Network EngineerCommented:
Hi,
As you are making use of 2 switches at 2 different locations from one building to another building but the Network is Same ,you can configure the new switch through console ,for the specified range of ip address and these 2 switches are connected to a Router as you have mentioned the port number 23 for telnetting Router,configure the new switch with console for the range of ip address from 99 to 110 ,and connect these 2 switches to ethernet port on to Router for Lan Connectivity in different locations.
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