Why we are configuring controller command in Router?

Answered Question
May 18th, 2010

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

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Correct Answer by Giuseppe Larosa about 6 years 6 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

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

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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