Category Archive Design

Catalyst 4500 Supervisor 7-E and Supervisor 7L-E

On the Catalyst 4500 Supervisor 7-E the uplinks ports can be used with 1GE with SFP GBICs or 10GE with SFP+. Only two ports are active on each Supervisor in a redundant configuration. If a Supervisor fails the physical ports should still remain active. &n…

EtherChannel Design Constraints

EtherChannel (or Port Channel) is a method to aggregate bandwidth or buldle ports between networking devices to provide or increase bandwidth capacity. The actual number of links which can be aggregated depends on the hardware and software capabilities. T…

Rapid PVST+ Design Constraints

Rapid PVST+ is the recommended version of Spanning Tree to be deployed. Rapid PVST+ should be configured in conjunctions with VLAN pruning on trunks, Portfast,& BPDU Guard on end-user ports (not ports connected to networking equipment like switches a…

How to develop VSS Design

A typical design using VSS to link the two Core 6500 switches is shown below. Notice that all links are forwarding (no STP loops), all Access switches see the Core are one switch, HSRP is not required and STP is turned on (Core is STP Root) but isn’t bl…

Typical Collapsed Core Design

A typical Collapsed Core (Layer 2 Access) LAN is shown below as an example. Here two core switches are used. Each Core does not typically require dual Supervisors unless high availability is of utmost importance. Each edge switch is connected to each Core…

Typical Single Core Design

A typical Single Core (Layer 2 Access) LAN is shown below as an example.   The Core switch will typically be a Layer 3 switch such as a Catalyst 3750 (stack) or Catalyst 4500 chassis with a Supervisor6-E. Ideally the Core switch has redundant compone…