INTRODUCTION TO SWITCHING

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SWITCHING

Switch

• It is Datalink layer device (Layer 2)
• Its is An Intelligent device
• It works with Physical addresses (i.e. MAC addresses)
• It works with fixed bandwidth
• It works with Flooding and Unicast
• It has 1 Broadcast domain and Number of Collision domains depends upon the number of ports.
• It maintains a MAC address table.

 

cisco-switching

Broadcast Domain

Set of all devices that receive broadcast frames originating from any device within the set.

Collision domain

In Ethernet, the network area within which frames that have collided are propagated is called a collision domain. A collision domain is a network segment with two or more devices sharing the same bandwidth.

Types of Switches
Manageable switches

On a Manageable switch, an IP address can be assigned and configurations can be made. It has a console port .

Unmanageable switches

On an Unmanageable switch, configurations cannot be made, an IP address cannot be assigned as there is no console port.

SWITCHING MODES

There are Three types of Switching Modes:

1) Store & Forward

A Default switching method for distribution layer switches.
Latency : High
Error Checking : Yes

2) Fragment Free

It is also referred to as Modified Cut-Through
A Default Switching method for access layer switches.
Latency : Medium
Error Checking : On 64 bytes of Frame

3) Cut through

A Default switching method for the core layer switches
Latency : Low
Error Checking : No

Latency is the total time taken for a Frame to pass through the Switch. Latency depends on the switching mode and the hardware capabilities of the Switch.

Console Connectivity

Connect a rollover cable to the Switch console port (RJ-45 connector).
Connect the other end of the rollover cable to the RJ-45 toDB-9 adapter
Attach the female DB-9 adapter to a PC Serial Port.
Open emulation software on the PC.

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