desai.jaideep Thu, 05/17/2007 - 03:00
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Hi


The very basic setup I can suggest is as follows :


This would be still a bridged network.

Replace the central switch and remote switches to cisco. You can go for Catalyst 2960 at all the places. There are various models available from 8 port to 48 port.

In that you can create etherchannel for both the links and that will take care of your redundency and even do load-sharing for you.

Etherchannel is a tool in cisco switches which can bundle two links between same switches to aggeregate the links.


Cisco 2960 Page : http://www.cisco.com/en/US/products/ps6406/index.html


Cisco Etherchannel page:

http://www.cisco.com/en/US/tech/tk389/tk213/tsd_technology_support_protocol_home.html



If you want switch level redundency, then You can go for two switches at central side. Each link from a site will go to seperate switch. Both these switches can be interconnected. Hence you will get full redundency.


Hope this may help.



Regards



JD

paolo bevilacqua Thu, 05/17/2007 - 03:18
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Hello,


I advise you against bridging for the design. Etherchannell has not be designed for WAN use and you would find yourself doing something very uncommon,plus this solution would not provide QoS and all the features you want on WAN links.


A regular design would use a router with two G.703 circuits at the branches, and one bigger one at the center, eliminating the "converters" (bridges). For example, 1841 with VWIC-2MFT, and a 7200 with 2 x PA-MC-8TE1 at the center. This is the only solution that will effectively bond the 2 x E1 lines in a single virtual pipe of 4 Mbps.


If this is too expensive, then all an ethernet router can be used, retaining the bridges, By shaping the traffic at 4 Mbps you can still have QoS. For example, 871 with "advanced ip services" at the branches (better would be 1811), and 1801 plus a vlan-capable switch at the data center.


In any case,Ip routing would take care of redundancy and laod sharing over the lines.




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