3750 Switches
control
Member Posts: 309
in CCNA & CCENT
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?
Comments
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oli356
Member Posts: 364
Where did you even read thatLab:
Combination of GNS3 and Cisco equipment if required. -
RouteMyPacket
Member Posts: 1,104
Where did you "read" that?
Try reading this
Cisco Catalyst 3750 Data Sheet [Cisco Catalyst 3750 Series Switches] - Cisco SystemsModularity and Design Simplicity:
Think of the 2:00 a.m. test—if you were awakened in the
middle of the night because of a network problem and had to figure out the
traffic flows in your network while you were half asleep, could you do it? -
control
Member Posts: 309
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TheShadow
Member Posts: 1,057 ■■■■■■□□□□
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.Who knows what evil lurks in the heart of technology?... The Shadow DO -
oli356
Member Posts: 364
Thanks, will read it over the next few days. Never heard about this before.RouteMyPacket wrote: »Where did you "read" that?
Try reading this
Cisco Catalyst 3750 Data Sheet* [Cisco Catalyst 3750 Series Switches] - Cisco SystemsLab:
Combination of GNS3 and Cisco equipment if required. -
Corndork2
Member Posts: 266
I believe the 48 Port versions are on a 40Gb backplane
I know the 3750G 24 port version is on a 40Gb backplane.Brocade: BAIS, BACNS, BAEFS Cisco: CCENT, CCNA R&S CWNP: CWTS Juniper: JNCIA-JUNOS
CompTIA: A+ (2009), Network+ (2009), A+ CE, Network+ CE, Security+ CE, CDIA+
Mikrotik: MTCNA, MTCRE, MTCWE, MTCTCE VMware: VCA-DV Rackspace: CloudU -
astorrs
Member Posts: 3,139 ■■■■■■□□□□
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.
