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Core switch in network

suthomas1
Frequent Contributor
Frequent Contributor

Hi,

This might be very naive question, but i am curious to know why is a core switch needed in the network.

I know for core routing this device needs to be there. But, if i have a network involving wan/internet links, Firewalll, edge switch etc.

In this case, can't i use the firewall to have all the major vlans and use it for routing?

appreciate all inputs to help get an idea on this. Thanks.

3 Replies 3

mfurnival
Enthusiast
Enthusiast

Hi,

You don't have to have a core switch. But it is standard practice to do so  - it is part of Cisco's hierarchical three layer model (access, distribution and core) where each different tier has different functions. The core's main function is the high speed switching of packets whereas more CPU intensive operations (classification of packets, ACLs etc.) are performed at other layers.

You could define VLANs and routed interfaces on the firewall but this might not be optimal depending on the size of your network. Do you really want every inter-VLAN routed packets going up to the firewall and back? And if your firewall fails then you have crippled your network.

Maybe if you can post a diagram of what you are planning it might help to understand your requirements better.

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

The three-tier-hierarchy is about to change with the impending release/announcement of the 6807-X/6880-X.  The announcement will be made during Cisco Live 2013 (Orlando).

There's a WebEx you can participate during the Breakout Sessions but the announcement will be made during the Openning Keynote Address.

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend
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