Why we are configuring controller command in Router?

Answered Question
May 18th, 2010
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Dear All,



      Can any one please clarify my doubts.


1.What is the difference between ethernet interface and serial interface?..( Both are giving 2 mbps,then what's difference)


2.Why we are configuring Controller configuration in router ?

i.e


controller E1 0/0/0
framing NO-CRC4
channel-group 0 timeslots 1-31


interface Serial0/0/0:0
description xxxxxxxxxxxxxx
ip address x.x.x.x 255.255.255.252
ip ospf message-digest-key 70 md5 7 password



Thanks in advance


Senthil

Correct Answer by Giuseppe Larosa about 6 years 10 months ago

Hello Senthil,


1) ethernet is a multi access technology that using Media Access Control allows to connect multiple devices. Each device is addressed by its MAC address. An ethernet frame has a destination MAC address, a source MAC address, protocol type that says what upper layer protocol is carried inside.

Ethernet does not use a TDM framing structure: when no traffic is sent there is silence. Each frame uses a 64 bits preamble to allow to potential receivers to sync with the frame. Between two distinct frames a mininum inter frame gap is needed this is equivalent of 12 bytes on wire.

Serial is point to point in nature, when synchronous there is a framing structure the frame header, there is no equivalent of MAC addresses (point-to-point)


2)

A controller E1 object handles a PRI interface allowing to configure some aspects like linecode, CRC, framing type and how the B channels are used (one or more channel-groups can be configured). From controller configuration one or more serial interfaces objects are created like in your example.

It is a choice of IOS for this kind of modules that have many configurable parameters.


There are some other modules that  haven't a controller object and use service-module commands in interface configuration mode to configure linecode and other E1 aspects.


Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Wed, 05/19/2010 - 00:03
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Hello Senthil,


1) ethernet is a multi access technology that using Media Access Control allows to connect multiple devices. Each device is addressed by its MAC address. An ethernet frame has a destination MAC address, a source MAC address, protocol type that says what upper layer protocol is carried inside.

Ethernet does not use a TDM framing structure: when no traffic is sent there is silence. Each frame uses a 64 bits preamble to allow to potential receivers to sync with the frame. Between two distinct frames a mininum inter frame gap is needed this is equivalent of 12 bytes on wire.

Serial is point to point in nature, when synchronous there is a framing structure the frame header, there is no equivalent of MAC addresses (point-to-point)


2)

A controller E1 object handles a PRI interface allowing to configure some aspects like linecode, CRC, framing type and how the B channels are used (one or more channel-groups can be configured). From controller configuration one or more serial interfaces objects are created like in your example.

It is a choice of IOS for this kind of modules that have many configurable parameters.


There are some other modules that  haven't a controller object and use service-module commands in interface configuration mode to configure linecode and other E1 aspects.


Hope to help

Giuseppe

Senthil Rajendra Wed, 05/19/2010 - 01:40
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Dear Giuseppe,



    Thank you for clarifying my doubts..What will be the maximum bandwidth,can we obtain in ethernet and Serial Interface?



Tks&Rgds


Senthil

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