Layer 2 vs. Multilayer Switches (CCNP) Tutorial Ebook Free

Ethernet Switch:-A Device that make forwarding decision based on Layer2 or Mac-address information

Its 48 bits in length and first portion of mac-address identifies Vendor(That manufacture that device).This Vendor identification called OUI(Organizationally Unique Identifier) and remainder of  24 bits are assigned by Vendor and this help keep all the different network devices in the world unique from one another base on the unique mac address and


Layer2 switch can use this mac-address information to make forwarding decisions

witch Populates the mac-address table also called as “CAM TABLE” and it can make forwarding decisions based on destination mac-address. That’s the general theory of Ethernet switch operation

Here if we Layer2 Switch if this switch trying to determine at which port it should forward the frame it can inspect multiple things:-

1. Layer2 Forwarding information (information in CAM table)
2. May be we have some “ACL for security” and also “ACL for Qos”

So Cisco Switch take those “Security ACL” and “Qos ACL” and some other information and merge that together logically and put that information to table referred to “TCAM Table”

Router vs. Switches

Layer Structure:-

Ø  Building Access Layer:- End user devices connected to the network in this layer might have L2 or L3 switches and these access layer switches may connect to the switches that reside at the network “building distribution layer”

Ø  Building Distribution Layer:- Probably Layer3 or Router which have multiple connection between switches and we have “red oval” going around the connection that called “etherchannel” 

Ø  Campus backbone: - concern with speed, getting traffic from one building distribution layer switch to other building distribution layer switch. We don’t do much packet manipulation at campus backbone. Some higher level switch cisco catalyst 6500 or other

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