Designing simple campus network based on best practices

Hello visitor,

If you are looking for something about designing stable and good network topology, see my figure.
This schema has been created by me based on CCNP - switch book. Genereal speaking If we need good network topology we have to thinking about redundancy and failover strategy.
I know that my topology is simple but is scalable also.

See my picture and I will try to describibe it:

Regarding Access layer - this layer is responsible for switching based on L2. Here we have one switch ber VLAN. This is good because if we have large segment we can use high density port switch. Or we can agregate switches together. Another switch another VLAN. Next level is distribution - it means that our L2 here is finished. And we are starting using L3 functionality. Here we have SVI per vlans for communication with L3 and HSRP for hight availability. HRSP allows us to have stable default gateway if one of distribution switch goes down or crash or other problem.

Redundancy looks good. If we cut one leg from yellow colour connection between access and distribution we still have connection to other L2 and core network (next internet, WAN, data center). If one from distribution switches goes down HSRP takes over default (next hop) gateway role for every VLANs.

Core is full mesh topology - means that we have connetion between all devices in core and distribution switches. There is L3 routing implemented. In my instance OSPF.  Because we need fast convergence time if any path failure. Between distribution and access layer switches we have trunk port connecitons.

For summarize:
Processing block can be adaptive. You can add next simillar block based on this topology. I hope that this figure help your understanding network designing. Regarding Spanning Tree there is limited only between access and distribution layer. Based on this VLAN ber switch approach we also have stable STP convergence because there is loop free topology.

Sorry If you find any english bugs here in this post but I'm writing all posts AD HOC without google translator support.

Good Day - networkers!