6 Replies Latest reply: Dec 8, 2011 3:54 AM by Brian RSS

    CISCO High Availablity Campus Network Design

    Aiman iqbal

      Hi all,


      Earlier cisco defined their campus network design as the three layers Access Layer, Distribution Layer and Core Layer and they implemented them as L3 vlans throughthe Distribution blocks and the L2 vlan would extend to the Core layer and the Core layer would be trunked redundantly to the distribution layer, The core layer would perform only switching operations and no routing, filtering and security features will be implemented. PVST is to be implemented with Port fast/Uplink fast/Backbone fast as per the requirements in the campus.


      BUT NOW!!!!


      As, The New model High Availability Model is there which say's that there would be routing between the core and distribution layers and can extend it to the access layer, the vlans would be terminated on the distribution blocks or the access blocks and rest all the links will be routed without the use of any FHRP, Here i am unable to understand that how multiple vlans data will be moving between the core layers if we chose the switchport option and we move it on trunk then in core we have to use the SVI but how we can use SVI without extending vlans and the other option is that we will use this port as routed portand if we make it a routed port then how multiple vlan data will move on that.


      Please throw some light on this so that i can have a better overview.