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Net Optics 10_100_1000 Copper Port Aggregator User Manual

Page 10

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10/100/1000 Copper Port Aggregator Tap

6

Figure_3._140% Utilization

Figure_4._Return to 80% Utilization

State 1: Side A + Side B is less than or equal to 100%

of the NIC's receive capacity.

State 2: Side A + Side B becomes greater than 100%

of the NIC's receive capacity.

State 3: Side A + Side B is once again less than 100%

of the NIC's receive capacity.

10/100/1000 Copper Port Aggregator

Memory Operation

Copyright © 1996-2008 Net Optics, Inc.

Example: On a 1000 Mbps link, Side A is at 300 Mbps and Side B is at 500 Mbps.

The NIC receives 800 Mbps of traffic (80% utilization), so no memory is required

for the monitoring device NIC to process all full-duplex traffic.

Example: There is a burst of traffic, so Side A is now at 900 Mbps, while Side B

remains at 500 Mbps. The NICʼs utilization is at 140%, requiring the use of

memory to help prevent data loss.

Example: Side A is again at 300 Mbps and Side B remains at 500 Mbps. The

NICʼs utilization is again at 80%.

Router

Side A

300 Mbps

10/100/1000 Copper

Port Aggregator

Firewall

Side B

500 Mbps

Side A

900 Mbps

Side B

500 Mbps

Side A

300 Mbps

Side B

500 Mbps

Monitoring Device

Side A + Side B

800 Mbps

1

Using a single NIC, the monitoring device

receives all combined traffic from Side A and

Side B, including physical layer errors.

2

Monitoring Device

The monitoring device receives 1000 Mbps

of combined traffic from Side A and Side B,

including physical layer errors.

The traffic to the 1000 Mbps

monitoring device is limited

to 1000 Mbps. The extra 400

Mbps of traffic is stored in a

one gigabyte memory buffer.

Memory continues to fill until

the giggabyte capacity is

reached or the burst ends.

10/100/1000 Copper

Port Aggregator

Firewall

Router

Side A + Side B

limited to 1000 Mbps

1

Memory

The Tap applies a first-in,

first-out process to all

packets. Once the burst has

ended and the NICʼs utilization

is again below 100 percent,

the Tap processes the packets

that were stored in memory.

As long as the NICʼs utilization

remains below 100 percent,

this

process

continues

uninterrupted

until

the

memory clears.

Once the memory has cleared, the monitoring

device begins receiving new data directly

from the link. The monitoring device

continues to receive all traffic from Side A

and Side B, including physical layer errors.

1

10/100/1000 Copper

Port Aggregator

Firewall

Router

Monitoring Device

Side A + Side B

800 Mbps

2

Memory

Network

2

1

A

LINK

ACT

B

LINK

ACT

2

LINK

ACT

1

LINK

ACT

www.netoptics.com

Network

2

1

A

LINK

ACT

B

LINK

ACT

2

LINK

ACT

1

LINK

ACT

www.netoptics.com

Network

2

1

A

LINK

ACT

B

LINK

ACT

2

LINK

ACT

1

LINK

ACT

www.netoptics.com

State 1: Side A + Side B is less than or equal to 100%

of the NIC's receive capacity.

State 2: Side A + Side B becomes greater than 100%

of the NIC's receive capacity.

State 3: Side A + Side B is once again less than 100%

of the NIC's receive capacity.

10/100/1000 Copper Port Aggregator

Memory Operation

Copyright © 1996-2008 Net Optics, Inc.

Example: On a 1000 Mbps link, Side A is at 300 Mbps and Side B is at 500 Mbps.

The NIC receives 800 Mbps of traffic (80% utilization), so no memory is required

for the monitoring device NIC to process all full-duplex traffic.

Example: There is a burst of traffic, so Side A is now at 900 Mbps, while Side B

remains at 500 Mbps. The NICʼs utilization is at 140%, requiring the use of

memory to help prevent data loss.

Example: Side A is again at 300 Mbps and Side B remains at 500 Mbps. The

NICʼs utilization is again at 80%.

Router

Side A

300 Mbps

10/100/1000 Copper

Port Aggregator

Firewall

Side B

500 Mbps

Side A

900 Mbps

Side B

500 Mbps

Side A

300 Mbps

Side B

500 Mbps

Monitoring Device

Side A + Side B

800 Mbps

1

Using a single NIC, the monitoring device

receives all combined traffic from Side A and

Side B, including physical layer errors.

2

Monitoring Device

The monitoring device receives 1000 Mbps

of combined traffic from Side A and Side B,

including physical layer errors.

The traffic to the 1000 Mbps

monitoring device is limited

to 1000 Mbps. The extra 400

Mbps of traffic is stored in a

one gigabyte memory buffer.

Memory continues to fill until

the giggabyte capacity is

reached or the burst ends.

10/100/1000 Copper

Port Aggregator

Firewall

Router

Side A + Side B

limited to 1000 Mbps

1

Memory

The Tap applies a first-in,

first-out process to all

packets. Once the burst has

ended and the NICʼs utilization

is again below 100 percent,

the Tap processes the packets

that were stored in memory.

As long as the NICʼs utilization

remains below 100 percent,

this

process

continues

uninterrupted

until

the

memory clears.

Once the memory has cleared, the monitoring

device begins receiving new data directly

from the link. The monitoring device

continues to receive all traffic from Side A

and Side B, including physical layer errors.

1

10/100/1000 Copper

Port Aggregator

Firewall

Router

Monitoring Device

Side A + Side B

800 Mbps

2

Memory

Network

2

1

A

LINK

ACT

B

LINK

ACT

2

LINK

ACT

1

LINK

ACT

www.netoptics.com

Network

2

1

A

LINK

ACT

B

LINK

ACT

2

LINK

ACT

1

LINK

ACT

www.netoptics.com

Network

2

1

A

LINK

ACT

B

LINK

ACT

2

LINK

ACT

1

LINK

ACT

www.netoptics.com