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Routing between VLANS

Posted on 2006-06-12
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Last Modified: 2008-01-09
HI!

I need help with routing between VLANs.  I'm using a DLink 3550 48-Port Switch.  VLAN-10 = 10.0.0.0/24 and VLAN-15 = 10.0.10.0/24.  What do i need to enable internet access to the gateway, which resides on VLAN-10, 10.0.0.1 from VLAN-15 and to allow access between the VLANs if need be.

current config:

main network address:  10.0.0.x/255.255.255.0
Exchange Server: 10.0.0.5
DNS Server: 10.0.0.6  
pix 501 firewall: 10.0.0.1/255.255.255.0

VOIP VLAN Network:
Asterisk Server (CentOS 3.0): 10.0.10.10/255.255.255.0
Linksys SP941 Phones: 10.0.10.20-10.0.10.32/255.255.255.0

Main Switch:  DLink DES-3550 48 ports (Layer 2 Managed Switch):  Ports 20-34 is setup for VLAN for VOIP, 10.0.10.x/255.255.255.0 and the rest of the ports are configured for 10.0.0.x/255.255.255.0

what's my best config to route?

on the top my head, i assume i need something like a cisco 2600 router with 2 ethernet ports, is that correct?

thanks in advance.

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Question by:jetli87
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by:fullerms
ID: 16892245
You have a couple of options

1. If you want to use your existing setup, yes a router will do. You could opt for a current generation router like the 2800 series. If your Dlink switch supports VLAN trunking, you could trunk all the VLANs on a single port and configure the router to route between the VLANs. Watch out for VLAN trunk support on the router IOS, you need an image which will support 802.1q trunking. Dlink will not support ISL.

2. You could replace your Dlink switch with a 48-port Cisco 3750, which will support intervlan routing, and the performance will be far superior than what you can get out of a router. If your phones are 802.3af capable IP phones, you can get one with PoE support.  Since you dont need any fancy routing protocol support, a switch with standard image will do.

Approx pricing in USD (please check with your local reseller, as prices vary)

Cisco 2821                             --  5k
Cisco 3750 - 48 ports              --  7k
Cisco 3750 - 48 ports with PoE -- 11 k

Hope this helps
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by:jetli87
ID: 16897137
thanks fullerms.

i've been combing through a lot archieves on the site and i'm generally getting a better understanding, however, i keep on coming across 802.1q trunking.  Can you explain what VLAN trunking is?

thanks in advance.
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