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Why we are configuring controller command in Router?

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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Hall of Fame Super Silver

Re: Why we are configuring controller command in Router?

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

2 REPLIES
Hall of Fame Super Silver

Re: Why we are configuring controller command in Router?

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

New Member

Re: Why we are configuring controller command in Router?

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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