Gigabit SFP-port speed?

Toggle sidebar Toggle sidebar
H

helloha

Honorable
Jun 4, 2012
27
0
10,530
I'm in the market for a gigabit switch, I've seen the Cisco SG-300-10. It has 2 x Gigabit SFP-ports.

The SFP implementation seems a bit vage to me. Can anyone tell me if they feature more bandwidth then standard gigabit ethernet on this switch? For future usage it might come in handy if they feature higher bandwidth. But if its just a Gb speed I'm better off buying a regular Gb switch.

THX!
 
Sort by date Sort by votes
B

bill001g

Titan
Aug 9, 2012
28,280
2,741
125,640
This is what comes from cisco site. Cisco tends to be a little better than some in stating the throughput rates.

What this means is it has 10 ports that can each send 1g and receive 1g for a total capacity of 20g. Not that anyone can possibly ever come up with a senerio that will actually use all ports at those rates. This is what makes the switch non blocking or wirespeed. You need to be sure other switches you compare it to are similar. Many unmanged switches do have the same ability.

The key here is this switch is a layer 3 switch so in addition to doing vlans and port aggregation and many other things this device can actually function as a router. This is where the second number related to forwarding performance comes in. These are normally state in packets per second rather than bits since the size of the packet makes a difference in the throughput but the processing power it takes is the same. Good manufactures always quote these numbers for worst case ...ie 64byte packets. In this case you can only route traffic at around 7.6 gbits/sec if you do the conversion. This is of course worse case but it is important when comparing it to other layer 3 switches. Many of the off brand switches will do their best to make their equipment look better than it is so you must really dig to get the true numbers.


Ports 8 x 10/100/1000 + 2 x combo Gigabit SFP
Performance Switching capacity : 20 Gbps ¦ Forwarding performance (64-byte packet size) : 14.88 Mpps

Still if you posted a similar question yesterday yes this only takes 1g sfp not 10g sfp+
 
Upvote 0 Downvote
barto

barto

Expert
Ambassador
Apr 20, 2009
5,465
0
27,960
As others have posted, SFP is simply the Gbic type for fiber optics. If you aren't using fiber, than ignore the SFP part.
http://www.cisco.com/en/US/docs/routers/7200/install_and_upgrade/gbic_sfp_modules_install/5067g.html

The switch you chose has either 1Gig downlink ports and two 1Gig ethernet combo ports. The four uplink ports are combo ports in pairs and tied together. Basically, if you use the ethernet port, the tied fiber port is unable to be used. Same thing if you use the fiber port, the ethernet port is unable to be used.

As other's have posted, your switch is capable of 20 Gig data processing. That doesn't mean it can shoot 20 Gigs down one line. Each line can only handle 1 Gig. And a Gig is the same regardless if it is copper (ethernet cable) or Fiber.

Do you know anything about networking? The switch you picked is a very capable switch and requires some knowledge of Cisco switching and the OSI model.
 
Upvote 0 Downvote
H

helloha

Honorable
Jun 4, 2012
27
0
10,530


I don't know that much about networking, I need to connect a file server with a ZFS raid to a couple of client computers. I put an extra HP 360T dual intel nic in the NAS server to aggregate 4 Gigabit lines to a switch.

From what I have been told it is safest to get a managed switch because sometimes the automatic settings flake out when you try to bind ports together? Thats why I went for this model.

I was also interested in the SFP-ports should they be faster then gigabit but this is not the case.

You think I should go for the entry model like this one?
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps10863/sg100D-08.html

THX!
 
Upvote 0 Downvote
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom