3750 Switches

Anyone have experience with these? I have read that the GB throughput on each port is not for each port simultaneously, but a shared 1Gbps for every 8 ports. First 8 ports have 1Gbps of throughput, next 8 ports share 1Gb throughput and so forth.............Surely this isn't correct?

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Comments

oli356

Where did you even read that

RouteMyPacket

Where did you "read" that?

Try reading this

Cisco Catalyst 3750 Data Sheet [Cisco Catalyst 3750 Series Switches] - Cisco Systems

control

It was here...

https://netappcommunities.jive-mobile.com/#jive-discussion?content=%2Fapi%2Fcore%2Fv2%2Fdiscussions%2F19108

TheShadow

May be true since the spec for it is only 32-Gbps switching fabric. What happens if you have 48 ports which seems over committed. I guess we would have to know the switching speed of the LSIC chips of which there is only one every 8 ports.

oli356

RouteMyPacket wrote: »

Where did you "read" that?

Try reading this

Cisco Catalyst 3750 Data Sheet* [Cisco Catalyst 3750 Series Switches] - Cisco Systems

Thanks, will read it over the next few days. Never heard about this before.

Corndork2

I believe the 48 Port versions are on a 40Gb backplane

I know the 3750G 24 port version is on a 40Gb backplane.

astorrs

The 3750G's had a 32Gbps switching fabric (48-port version is 1.625:1 over-subscription).

For northbound traffic all ports on the switch share the 1Gbps uplinks so again you're looking at over-subscription of somewhere between 6:1 and 12:1. If you have one of those weird ones with the 10GB Xenpack uplink those were 1.25:1 oversubscribed (8Gbps max) as well.