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Hierarchical Design – (Campus Core , Distribution, Access)
- Redundant supervisors, power supplies, uplink connections, FHRP, Stackwise.
- Dedicated to meeting the functions of end-device connectivity.
- First layer of defense in the network security architecture.
- First point of Negotiation between end devices and network infrastructure.
- Feature rich because of the various devices connected to it.
- Security, QOS, policy trust boundry functions.
- Redundant paths, layer3 load sharing, dynamic routing, FHRP.
- Aggregation point for all access nodes.
- Connectivity and policies for traffic-flows within a single access-distribution block (east-west traffic flows).
- Aggregation, policy control, isolation demarcation points between campus distribution blocks. ( north-south traffic flows).
- Configuration choices often depend on the requirements of the access layer.
- Highest speed and failover.
- Dedicated to providing nonstop connectivity across the entire network.
- Always on mode ( 7x24x365).
- Provides the appropriate level of redundancy.
- he core layer serves as the aggregator for all the other campus.
blocks and ties together the campus with the rest of the network.
- A sperate core layer isnt needed for a small network <300 users (Collapsed core design).
- The advantage of the modular blocks due to the isolation it can provide.
- Failures that occur within a module can be isolated from the rest of the network.
- Modular blocks offers repeatable design standards.
- When one module is missing capacity it can be updated or replaced by a new block with the same structured role.
- A campus network can have multiple different modules ( Building blocks / places in the network PINs).
- Control plane flexibility
- Forwarding plane flexibility
- User group flexibility
- Traffic management and control flexibility
- flexibility to support multitenancy and traffic isolation requirements