DCI

Hi,

what is the best way to interconnect 3 data centers..., partial mesh or full mesh.

we have CWDM/DWDM between 3 DCs and layer-3 links to ISP which will serve as backup 100mbps links.

Is DC-A to be connected to DC-B and DC-C (Partial mesh) best idea or full mesh DC-A to DC-B and DC-B to DC-C and DC-A to DC-C

which is best for the design. IS-IS will be running at core level. for all dc 6500 switches and 7600 routers will be used.

upgradable for mpls when we have SIP line cards in few months..

what do you guys recommend..

 

Comments

  • for multi-site deployment VPLS is recommended solution, for point-to-point connections EoMPLS or EoMPLSsoGRE regarding you have or haven't access to the MPLS in ISP cloud

    Consider also separate L3 connection between Core between DC and separate L2 connections from Aggregation layer devices via DCI Edge

  • Is DC-A to be connected to DC-B and DC-C (Partial mesh) best idea or full mesh DC-A to DC-B and DC-B to DC-C and DC-A to DC-C

    Depends on your requirements. Does DC-B need to communicate with DC-C, even when DC-A has gone offline? If yes, then you need full mesh.

  • hi,

    thanks for the reply...

    how about converting layer-3 into layer-2 with l2tp. is this a good option to consider or layer-3 is needed as backup.

    how about backup with layer-2 links..so now the dci is layer-2 and even the wan is also layer-2..can we consider this option..

    if we consider the triagle full mesh dci connection, then is it worth going to full layer-3 option or mix and match with layer-2..

    we need to consider the convergence from end to end...

     

     

     

  • hi,

    thanks for your reply..

    full mesh would be best option to go for..but in terms of redundancy/failover/convergence is full mesh good option (with layer-2/layer-3 mixed)

     

  • There are a lot of variables to consider. So much depends on your application and availability requirements.

    You're probably better off finding a local consultant to assist - there's just too many questions to ask and answer here.

  • hi,

    thanks for the reply..

    this is just initial stage of the design and i am in touch with cisco as well..just wanted to know from other people who have done the DCI in their networks..

    is it better to run 6500 VSS within DC and run Nexus 7K for DC interconnect(OTV)..

    since we already have 6500, so with sup-2t EoMPLS and VSS within and accross the DCI over OTV..does this make sense..

    core being Nexus 7K and Aggregation being 6500 in all 3 DC's..

  • is it better to run 6500 VSS within DC and run Nexus 7K for DC interconnect(OTV)..

    As before, it depends on your application and availability requirements.

    Figure out what applications you need to host, what connectivity and availability requirements they have, and go from there. 

    You're starting at the wrong end. Don't start talking about VSS or L2TP or OTV. Start from the application side. That drives your network design.

  • thanks for the reply..

    yes all things will be considered from all layers..just divinding the things as app layer, os layer, network layer, security layer..

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