Switching

Hi

Please tell me the way to calculate the switch backplane and switch Throughput  ( For Example , In Technical Specification it is written that switch supports 1Tbps non blocking backplane and 2 million packets per second trhoughput)

Thanks

Amit

Do you have the exact statement and the platform presented in the datasheet?

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Backplane Speed EX4500: Up to 128 Gbps (Virtual Chassis)

EX4550: Up to 256 Gbps (Virtual Chassis)

Data Rate 960 Gbps (full duplex)

This all are written in Juniper 4500 datasheet

OK, I see what you mean.

Backplane here means the dedicated VCP cables.

On EX4500, you can have 2 VCP. Each VCP cable has 64Gbps full duplex. Two cables, 128Gbps full duplex.

On EX4550, you have a slot where you can add 2 more VCP cables. Hence the 256Gbps full duplex

Dataplane rate is for network ports. And in ex4500 you can have up to 48 10G ports. This is 480Gbps simplex, 960Gbps full duplex. That's why it's unblocking. The data plane rate matches the maximum possible traffic that can be sent through the ports.

The number of maximum pps comes probably from the chipset used in the platform.

In case you need to find out how many packets you need for wire speed:

http://kb.juniper.net/InfoCenter/index?page=content&id=KB14737

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