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Network Design Questions

I am finalizing the design of our new corporate network. It will consist of the following:

Work Station Access - 3548 XL Switches - 2 per floor (one East / one West) ; total of 14 for seven floors. Each side of a floor will be a separate VLAN (Subnet). Switches will have 2 1000Base-SX GBICs. One GBIC will connect to fiber running to opposite closet/3548 Switch on that floor for redundancy. Other will terminate into a Catalyst 3508 XL Concentrator switch at the Core..

Server and WAN access: Other 3548 's will be "Giga Stacked" to form access stacks for Servers, Firewalls, WAN, and Internet access. These stacks will be connected to the Core 2948G-L3 's via

802.1Q "Channel Group" VLAN trunks. (groups of 2 to 4 FE ports)

Distribution/Core: Consist of 3 3508XL Switches to aggregate the GE fiber from the 3548''s. First Question: Should these 3508's be connected together via GigStack Modules or just plain 1000B-SX ?

Also connected to the 3508's will be 2 2948G-L3 Switches for routing function.

Current plan is to assign one 2948G-L3 to "West" subnets, and other to "East" subnets. Each 2948G-L3 attached to 3508's via one fiber GB Ethernet. Other GB Ethernet will connect the two 2948's together to keep inter-Server traffic off backbone.

Questions:

1) Planing to utilize Spanning Tree for the East-to-West recovery link (if link to 3508 is lost) Is this sound? Better design?

2) What is best way to link the 3508's together - GigaStack modules or 1000B-SX, and why?

3) Will one GBE link from each 2948G-L3 to 3508 be OK or should I use 2 and connect the 2948's together with FE Channel groups?

4) Is splitting "east" and "west" Subnets (VLANS) between 2948s a sound idea? Can I use HSRP and secondary IP addresses to back one another up?

Better design?

Any other comments welcome. TIA.

1 REPLY

Re: Network Design Questions

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you, or there is no public information available at this time. If you don't get a suitable response to your post, you may wish to review our resources at the online http://www.cisco.com/go/solutions. You may also contact our product information line at 1-800-553-NETS or a Cisco Systems Engineer at your local Cisco office or reseller. To locate your local Cisco representative, visit http://www.cisco.com/warp/public/687/Directory.shtml

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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