CISCO Hardware for splitting bandwidth

Posted on 2012-09-04
Last Modified: 2012-09-05
Hi Guys,

I just need suggestions for what hardware and Architecture to use -- to split the WAN link that I have to the company -- between offices
We want to install 20Mbps link (Fiber) comming into Main office from where we want to be able to split it and provide 2 offices with 5Mbps each. that is main office 10, office-1, & 2  5 each.

all offices are in the same building - no config required -- just a high level picture

oh! maximum failsafe/redundancy is a must

Question by:meero-IT
    LVL 2

    Expert Comment

    So one will correct me if I am wrong. Probably the best to is have each company on there on vlans. Next set up acls so that each company cant talk with each other. Last setup QOS on the router using the vlans.
    LVL 10

    Accepted Solution

    For router hardware I would go with something like a Cisco 3925 or 3945.  It is very robust and can handle that kind of bandwidth without an issue.  For switches it really depends on how many users you are talking about in each location.  I would do 3750V2's at the main business and then 3560V2's at the other businesses attached to the 3750V2 via fiber.  Attached is a high level drawing that gives you an idea.

    You would then put all businesses in their own subnet (VLAN) and use the 3945 as a router-on-a-stick to route traffic between the businesses as needed.  If you have a lot of users or traffic then you could get bigger switches (4500 or 6500 series) and do the routing at the main business switch(es) instead of taking it to the router.

    To split the bandwidth you will have to do QoS on the router identifying the subnets to classify the traffic.  That's a quick, dirty overview.  Lots of details and things you need to take into account but that will get you moving in the right direction.

    As far as redundancy, you can run multiple links from the access switches (3560s) to the main switches and same to the router which will give you redundancy for bad ports but there is no redundancy for the Internet connection unless you get a secondary ISP and router that you can failover to in case the primary goes down.  This is a lot more money but may be worth it depending on your needs.

    Author Comment

    qbakies: That is wonderful, just one thing though -- how about redundancy, would like to avoid single points of failure as much as possible -  and put dual links where ever possible.

    and how about using Class-maps to divide bandwidth ?

    thanks for the quick response guys
    LVL 10

    Expert Comment

    Yes, you can certainly put in dual links for redundancy.  It's just important to realize that there is no WAN redundancy in this design.  Redundancy is easily acheived but increases costs dramatically in some cases.  Typically it can be difficult to sell management on redundancy costs unless they have felt the pain of a down network before.

    Class-maps are part of QoS so that is what you will use to split your traffic.  Class-maps identify traffic.  Policy-maps say what to do with the identified traffic.  Good luck!

    Author Closing Comment

    Thanks Gentlemen
    You guys are genuinely great

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