I believe there are two reasons to have a distribution layer.
First:- it is used to aggregate a large number of access layer devices to the core, in case you have more access switches than you have ports on your core :-)
Second:- The core of network is meant for delivering performance and this is a highly desirable situation e.g. in Service Provider networks it's critical that the core does things at speed. So the distribution layer is where all the ACL's and policies are applied.
whereas more control and keeping broadcasts away from the core are not the things you will get out of a distribution layer. Adding another layer won't decrease the overhead related to managing network devices.
in a modren hierarchal networks the distribution layer very important because it has alot of major roles in the switched network and in medum size networks the distribution/core layers in one layer almost
so the access layers have the vlans in layer two assiegned to ports while the layer three interfaces for these vlans and the routing between these vlans done on the distribution layer
with dual distribution layer and redandunt uplink from access to Dist u can achive redundance, loadbalncing and high availabiltiy to ur network
in distribution layer most ACL filtering and QOS policing or remaring configured there
in case of core layer the distribution layer saamurize the route from the access sithes and send it to the core layer as a summary route
but somtimes as i mentioned above the distribution layer switches do the both roles as distsribution and core at the same time which is practical for small and medume networks
with distribution layer u move ur network from flat switched network that contains alot of proplems like single point of faulor to a hirerichal switched network
the core usualy link betwenn diffrent networks block for example
lets say u have two big buldings each building has its access and distribution layers the core layer will link between those two buildings and route traffic between them on L3 then go the distribution switches in dist switches will be routed to the right L3 valn and passed to corsponding L2 vlan in the access switch
The purpose behind "physical" network layers, such as access/distribution/core, really concerns scalability.
If you had 30 or 300 hosts, that could be connected to one network device, would you have them connect to just one device, or multiple devices? If multiple devices, how many, what kind, and how would you structure the network device interconnections?
The prior questions answers are "it depends". You might need a distribution layer for 30 hosts and not for 300, the converse, both or neither.
I can't think of advantages of a "distribution layer" in the abstract (beyond layers in general). Actual advantages (or disadvantages) need to be examined in light of an actual network with actual requirements.
I have to do a presentation on the new distribution layer that we are installing, I need to tell management probably 4 or 5 benefits in simple terms , Can anyone help on this with the best things to say?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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