Ethernet lab
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Ethernet Lab. Lab #3. Overview. Create Ethernet Header Bitstuff packet Search for frames in the middle of physical layer 90 byte data. Preamble. Dest Address. Src Address. Type. Body. CRC (zero). Postamble. 8 bits. 48 bits. 48 bits. 16 bits. 1-56 bytes. 32 bits. 8 bits.

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Ethernet Lab

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Ethernet lab

Ethernet Lab

Lab #3


Overview

Overview

  • Create Ethernet Header

  • Bitstuff packet

  • Search for frames in the middle of physical layer 90 byte data


Ethernet header

Preamble

Dest Address

Src Address

Type

Body

CRC (zero)

Postamble

8 bits

48 bits

48 bits

16 bits

1-56 bytes

32 bits

8 bits

01111110

Bit stuffing

01111110

Ethernet Header

Type=0, CRC=0


Bit stuffing state machine

Bit Stuffing State Machine

0

1

0

1

0

1

0

1

0

1

Insert 0


Non byte boundaries

Non-byte Boundaries

Dst addr 0xffffffffffff, src addr 0x8000ff002311, type 0,body 0xfc,crc 0

ff,ff,ff,ff,ff,ff,80,00,ff,00,23,11,00,00,fc,00,00,00,00=

1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111

1000 0000 0000 0000 1111 1111 0000 0000 0010 0011 0001 0001

0000 0000 0000 0000 1111 1100 0000 0000 0000 0000 0000 0000

0000 0000

1111 1011 1110 1111 1011 1110 1111 1011 1110 1111 1011 1110

1111 1011 1100 0000 0000 0000 0111 1101 1100 0000 0000 1000

1100 0100 0100 0000 0000 0000 0011 1110 1000 0000 0000 0000

0000 0000 0000 0000 000

fb,ef, be,fb, ef,be, fb,c0, 00,7d, c0,08, c4,40, 00,3e, 80,00, 00,00, 0


Now with sentinels

Now with sentinels

0111 1110

1111 1011 1110 1111 1011 1110 1111 1011 1110 1111 1011 1110

1111 1011 1100 0000 0000 0000 0111 1101 1100 0000 0000 1000

1100 0100 0100 0000 0000 0000 0011 1110 1000 0000 0000 0000

0000 0000 0000 0000 0000 1111 110

7e,fb,ef, be,fb, ef,be, fb,c0, 00,7d, c0,08, c4,40, 00,3e, 80,00, 00,00, 0f,c0

Original 19 bytes, stuffed with two sentinels 23 bytes


Framing

Framing

  • There can be more than one Ethernet packet in a 90 byte physical layer data segment

  • If you encounter a bit stuffing error, look for a beginning sentinel for the next packet.


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