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network planning for new branch office

Posted on 2013-01-08
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Last Modified: 2013-04-15
We will have a new branch office in a building next door which about 400 meters. Between the branch and main office, cables can go through carpark and then up to the riser.

As all internet, phones server and servers are all located in main office and the new branch will have about 150 staff, I am thinking setup a stack of Cisco switches on new branch and connect to the switch in main office with a new fiber without setup VPN.  so that the branch staff can access to the main office facility.

In terms of network and redundancy, can I have your comments and idea please?
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Question by:tonitoni99
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rauenpc earned 1500 total points
ID: 38757729
No matter what, make sure the fiber you trench is capable of 10G. Make sure you have at least two connections back to the main office, and connect to different switches or blades so there isn't a single point of failure. Consider your over subscription ration... 150 users connected at gig with a single gig uplink could cause issues. A 2.5/1 ratio or better is ideal, but achieving this costs money. This means that with 150G worth of user ports means 60G worth of uplink. A stack of four switches covers the 150 users, and you would end up needing eight 10G uplinks. Eight? You mean six? I assume you'll configure a port channel back to the main office, and it's only recommended to do 2, 4, 8, or 16 port port-channels. To save money you could start with four 10G connections, but lay the fiber infrastructure to support the higher bandwidth.

Depending on feature needs, the cost of a stack of 4 switches can be comparable to a chassis switch like a 4506E, so look into multiple options.

With a direct fiber connection, both layer 2 connectivity and layer 3 connectivity are viable options. I personally prefer layer 3, but layer 3 will cost a bit more for the hardware and licensing.
For layer 2 stacks, I would go with the 10G 2960S switches
For layer 3 stacks, I wou ld go with the 3750X series with 10G modules.
Chassis switch would be a 4506E or 4510E.
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by:tonitoni99
ID: 38757821
Hi rauenpc, thanks for your suggestion. Does "four 10G connections"  mean four 10G fiber lines between main office and branch?

also, do you think it's worth to put a Cat 6 ethernet cable as backup line? thanks
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