12-28-2018 11:32 AM - edited 03-08-2019 04:55 PM
in LAN network,
what is difference between core layer switches & Distribution Layer switches in terms of Function?
in LAN network,why it is useful to use 3 layer design rather than 2 Layer design i.e.core + Access
12-28-2018 12:43 PM
Hi @knaik99,
This link covers the layers and their functions:
https://www.cisco.com/web/learning/netacad/demos/CCNP1v30/ch1/1_1_1/index.html
Regards
12-28-2018 04:23 PM
12-28-2018 09:31 PM
12-29-2018 12:17 AM
12-31-2018 09:04 AM - edited 12-31-2018 09:05 AM
The function of core and distribution switches is to some extent based on the physical layout of your network. If you have an office building for example, each floor could have a pair of distribution switches, all connected to the core switches in the main server rooms. This helps simplify wiring and helps prevent bottlenecks.
If for example had a large amount of traffic between floors 4 and 8, and similarly between 6 and 10, a ring layout with each floor connected to the one above and below would require the links between the switches on floors 6, 7, and 8 to handle both the 4-8 and 6-10 traffic. The core and distribution tree avoids sending the data over unnecessary links.
Depending on the size of the network and the ammount of data transferred, you really don’t need all the layers.
Using layer 3 at the access or distribution layer means that inter VLAN traffic does not have to go as far before being routed to the other VLAN. Two computers on different VLANs connected to the same switch that want to connect have to talk to the router for the destination VLAN. If the only layer 3 routing is at the core layer, the traffic has to go all the way up to the core layer and back down to the same switch, utilizing those links. With layer 3 switches before the core layer, the computers can be configured to use their access or distribution switch as their router, and the traffic can be switched to the other VLAN locally without going up to the core layer.
01-01-2019 01:19 PM
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