Connecting a New Building - Campus Network

Posted on 2008-11-19
Last Modified: 2012-06-22
We are to network a new building, it will be connected via fibre connections.  My question is I wanted this to be a seperate routed block, so did not want to tag any vlans on the uplinks.  We use layer 3 switches at the Core network and Dist layer, I hoped to avoid any layer 2 trunking across the links by using all network subnets and routing between the 2 buildings.  

I was thinking of using RIP between the routers (New Build > CORE)

Will this be the best approach or does anyone think I should tag VLANS across for existing voice, etc?

The 3coms we have are 5500G's which should do layer 3 switching in hardware.
Question by:bromley_college
    LVL 21

    Expert Comment

    routing is good, however, I'm not sure about several things:
    1. you definitely want to have management in a separate vlan, so you will need vlans between buildings: first - mgmt, 2nd - data, 3rd - may be voice?
    2. you definitely don't want to use rip if you have only 2-5 routes within routing table, possibly it is faster/better/enough to maintain several static routes, then troubleshooting dynamic routing from time to time.

    P.S. management vlan should be plain L2, so without possibility to be routed in it from data/voice vlans. in this case I do the following: management stations are configured to receive multiple vlans - mgmt and data, otherwise you have to configure routing filters and you definitely don't what to do that.


    Author Comment

    Thanks for the reply.  I was hoping to use a different mgmt vlan for the new build, and set up a routed link between the builds.  As the 5500 should do layer 3 in hardware I should get lagging for this and voice should I?

    I will be summarising all networks into one route advertisement so static is best like you said.

    Is there anyway to do without the vlan trunking, I really do not want it... I will of course be testing all configurations but I hope voice will be fine routing across the links.
    LVL 21

    Accepted Solution

    It is very nice idea to have only plain L3 between buildings, however you should foresee that someone one day will ask you for a vlan from building to building even if today you plan everything perfect without vlans.

    It's just my experience working as an leading network engineer.

    In hw L3 and sufficient bandwidth you will be save with voice quality!

    As for routing, ospf is better than rip, and I wouldn't build two routing instances in both buildings unless you have several internet connections.

    Featured Post

    PRTG Network Monitor: Intuitive Network Monitoring

    Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

    Join & Write a Comment

    There are two basic ways to configure a static route for Cisco IOS devices. I've written this article to highlight a case study comparing the configuration of a static route using the next-hop IP and the configuration of a static route using an outg…
    Don’t let your business fall victim to the coming apocalypse – use our Survival Guide for the Fax Apocalypse to identify the risks and signs of zombie fax activities at your business.
    Viewers will learn how to connect to a wireless network using the network security key. They will also learn how to access the IP address and DNS server for connections that must be done manually. After setting up a router, find the network security…
    This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor ( If you're looking for how to monitor bandwidth using netflow or packet s…

    728 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    17 Experts available now in Live!

    Get 1:1 Help Now