Will on-board Gigabit Ethernet ports on a Cisco 3845 support a 100 Mb SFP?

Hi,
This is a very specific question - hopefully someone has tested this or run into this scenario...
I was trying to connect a Cisco 3845 router to a 100 Mbps circuit. Specifically, I was trying to connect this circuit to the on-board Gigabit Ethernet port (Gig 0/0). This is the port that can be used as either an RJ45 or SFP slot. The only SFP I had was a multi-mode 100 Mbps SFP. When I hooked it up to Gi0/0, I got a message saying the SFP type wasn't supported on the chassis.
I was able to deploy the 3845 and since then I haven't had the correct hardware to recreate the exact scenario. Has anyone experienced this? Is it simply because Gigabit interface on a 3845 won't support a Fast Ethernet (100 Mbps) SFP?
Thanks.

Not all SFP's will just plug in and work. Here are the SFP's that are considered compatible with the 3800 series ISR's.
GLC-LH-SM= Gigabit Ethernet SFP, LC connector, LX/LH transceiver
GLC-SX-MM= Gigabit Ethernet SFP, LC connector, SX transceiver
GLC-ZX-SM= 1000BASE-ZX SFP
CWDM-SFP-1470= Coarse wavelength-division multiplexing (CWDM) 1470-nm SFP Gigabit Ethernet and 1G/2G Fibre Channel (FC)
CWDM-SFP-1490= CWDM 1490-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1510= CWDM 1510-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1530= CWDM 1530-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1550= CWDM 1550-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1570= CWDM 1570-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1590= CWDM 1590-nm SFP Gigabit Ethernet and 1G/2G FC
CWDM-SFP-1610= CWDM 1610-nm SFP Gigabit Ethernet and 1G/2G FC
http://www2.bt.com/static/i/media/pdf/cisco_3800_routers_faq.pdf

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Hi ,
Whether someone know the minimum interframe gap in gigabit ethernet port in Cisco switch ,3750.
Also ,would like to know the IEEE standard for the same.
Thanks in advance,
Thomas.

the interframe gap for 1-GB is 96 nanoseconds of 96 bit size.
the minimum IFG for is 96 bit times. (the time it takes to transmit 96 bits of data at the specified data rate)
ie:
10Mbps - 9.6 milliseconds
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http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ethernet.htm

Using both Dual Gigabit Ethernet Ports

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If I plugged both of my ethernet ports into my LAN switch, that would double the bandwidth to and from my machine. A switch does not used shared bandwidth like a hub does. I realize that it won't speed up any of the other devices that are plugged into the switch. Regardless, I would have the capacity for double the bandwidth to my machine.
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It's easy to try... it's call "Link Aggregation"...
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MDS9222i Gigabit Ethernet Ports

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In addition to Bob's comments, it's important to understand that Gigabit Ethernet requires using all four pairs of wires inside the cable ... regardless of whether that cable is CAT-5, CAT-5e, or CAT-6 certified. The real difference of the categories is how high of a frequency can they support. For example CAT-6 is rated for 10 Gigabit traffic. It's not that CAT-5 won't work, but it's not guaranteed to do so.
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As you probably have noticed this is way out of the range of my apple-knowledge:
Where can I find the coupps-folder?
And how can I reinstall them?
The Printer Setup Repair says:
2 missing files/directories found during the verification process. They may be responsible for certain printing problems. Printer Setup Repair cannot replace these items. Please refer to the log file for a list of the missing files/directories. You may need to reinstall OS X to resolve your printing issues. Certain files and directories are deleted when using the Reset Printing System option. These files and directories, if required, will be recreated during normal printing.
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Hi dynastyuk,
There are some other really cheap alternatives around for gigabit ports...
This for example:
http://www.google.co.uk/products/catalog?hl=en&q=gigabit+switch&cid=18212157716750550582&ei=O2BUTZ2W...
12 quid for a gigabit switch (Just connect all gigabit capable devices into the switch and connect the switch to the homehub)
I hope this helps
Like this post? Give it a Star . If this post answers your question, please Mark it as the Accepted Solution.

The three gigabit ethernet ports:

Do the three 1000Base-T ports form a switch, managed switch, transparent bridge, or a bus (Hub)? If capable of switching at layer two what standards are manageable? I am wondering if Vlan and Trunking (IEEE 802.1Q) is supported as well as common spanning-tree protocol IEEE 802.1D.

Kmann wrote:
Thank you for your reply. My questions concern layer two functionality. Specifically IEEE 802.1q Vlans and VTP. Since ServerX supports dot1Q I was curious if these interfaces could be assigned vlan membership. I was at the apple store yestrday and I did not think to ask.
There is nothing in the Airport utility management interface to suggest either support for VLANs or trunking. Actually, trunking seems fairly silly on a 3/1 port hub, so even if it were possible, it likely be a waste of time to implement it (after all, any trunk of two would have to uplink either to the 1 WAN port or up the remaining 1 LAN port).
As for VLANs, that could be more useful, but again, there is no ability to manage that -- not in terms of either segregating ports into VLANs nor trunking mulitple 802.1q tagged VLAN down a single port -- even if it's possible on the switch. Again, I'd imagine few users would make use of this function, so even if possible, it'd be a low implementation priority. Especially, since OSX VLAN implementation is very, very crippled (e.g. seems like neither DNS nor mDNS works in OSX VLANs -- see http://discussions.apple.com/thread.jspa?messageID=5425126).
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Airport Extreme with Gigabit Ethernet - Does it have jumbo frame support?

Please, can I get definite answer to this question? I do not need speculations as I read some reviews already. Can we have Apple finally put complete specification of the product rather than "popular one" with attachement of protocol numbers?
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3. If there is no support then does Apple plan on update for this (firmware or hardware) in the future?
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I just need reliable answer by product specification that should be on paper at Apple, but it is not so I hope that one of guys here has access to some engineering team.
Thank you,
Maciek Samsel

The spec. on the chip used by Apple support your conclusion.
BCM5395 Features
Complies with IEEE802.3, IEEE802.3u, IEEE802.3ab standards
5 10/100/1000Mbps Auto-Sense RJ45 ports supporting Auto-MDI/MDIX
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Compact field processor (CFP)
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Z87-GD65 LAN Gigabit ethernet port issue

I just installed my new Z87-GD65 and it boots up just fine, but the LAN port is not functioning. The indication lights on the LAN port is not flashing at all.
Tried swapping network cable and tried to connect it to two different switches and a router, all with same result. Do I have a dead LAN interface on my hands?

What OS are you running?
Install drivers from below:
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Dropping Gigabit Ethernet connection

Hello,
I found out a strange issue on my mac mini 2011 with Gigabit Ethernet port and what I see that it is works on automatic mode, in 100 mbit speed, but today I bought cisko 1 gbit switch and I still see in network utility 100 mbit. If I force the 1 gbit speed in seeting I will get error message like cable was unplugged.
Don't tell me that I have broken logic board. My varanty finished 2 months ago.
Thank you.

OK ****! - was I wrong...
After the above entry I packed up my MacBook, headed out to the Mac store and dropped it for repair; they had it overnight. "The Genius" called me to pick it up the next day. The answer:
There's nothing wrong with your MacBook. They copied files back and fourth between my MacBook and many other hosts on their network; it performed as expected.
I gave him a short history of the problem, and he said, "OOOOOooohhh, it's the Belkin." I brought my baby home, did a little research, found that others had a similar problem and found an acceptable fix. I ordered the new switches, a 5-port for my desk and an 8-port for the servers in the back room; incidentally, these items were inexpensive.
I swapped out the Belkin F4G0500 for the TrendNet TEG-S50g and everything started popping:
The MacBook received (and retained) a DHCP lease
Files copied between the Mac and other hosts at gigabit speeds
I should say the rest of my gear, 3 Linux Servers, a Linux Desktop/Laptop, and printer all made use of the Belkin at gigabit speeds (100MB file between Host A <--> Host B in 2 seconds), it was only the Mac that had trouble with the Belkins.
I split this evenly between Belkin and Apple as a responsibility to fix for we the buyers. It's 2012, we should have layer 3 (switching) sorted out by now. This was minor but pricey pain in the ***.
Troubleshooting Techniques:
Create Files of a Specific Size
You can use the "dd" (Unix) program to create files of a specific size. To test gigabit speeds, specific file sizes take the guessing out of the equation.
Open the Terminal (Utilities directory)
To create test files, enter both of the following lines (line one, then line two, giving each time to finish):
dd if=/dev/zero of=~/Desktop/output_100MB.dat bs=1M count=100   # Creates a 100MB file
dd if=/dev/zero of=~/Desktop/output_1GB.dat   bs=1M count=1000 # Creates a 1GB   file
The files created in Step 3 will now be on your desktop ready for transfer/testing.
Quit the Terminal.
File Transfer Calculator
This calculator will give you an approximation of what transfer times should be; at least it's close enough for me. There will be a little flux due to various (network) conditions, within 2-3 seconds it seems, but generally these estimations should hold.
For my problem, I wanted to test a 100MB & 1GB file transfer between 2 computers (both with Gigabit Network Cards) on the same switch.
EG: for the 2 files, I fill in the calculator:
100MB file: Size: 100; Size Lable: MB; Speed Lable: -none ; Select Speed by interface: Wired Lan Gigabit Ethernet --> click Calculate = estimated 2 seconds.
1GB file: Size: 1; Size Lable: GB; Speed Lable: -none ; Select Speed by interface: Wired Lan Gigabit Ethernet --> click Calculate = estimated 9 seconds.
Verify Gigabit Speeds on the Switch
The Trendnet ports will light up GREEN for each port that is functioning at gigabit (1000 Mbit/s) speeds; ports that are only running at Fast Ethernet speeds (100 Mbit/s) will light up AMBER. Transfers must occur between any 2 computers lit green on the switch.
When I copy the files to another (host) computer I see transfer times for:
The 100MB file is on the money: 100MB   50.0MB/s 00:02 seconds.
The 1GB file takes a little longer: 1000MB 47.6MB/s 00:21
Here we see approximately 50.0MB/s transfer times for both. The File Transfer Calc estimate was off by 12 seconds but I did notice that the transfer degraded slightly (in speed) the longer it persisted; even though that's true, the MB/s is similar.
If you have a similar setup as me (1 switch under your desk, and 1 in the server room), repeat the transfers to (hosts) computers in the back room with a green light on the switch. The transfers should be similar if not the same.
It's not perfect but it's a week later and I'm almost $200 down; it's close enough for jazz and better than what I had before. I'm tired of screwing with it.
Cheers all,
TT

How to tell if my netbook has gigabit Ethernet (and/or can use it)

I have owned an Asus Eee 701SD (the 8GB version) since 2009, and installed Arch on it last summer (a great move :-) ).
The other day, I came across a page on the FreeBSD wiki, which suggested that certain 700-series Eee's have a gigabit Ethernet interface (rather than the usual 10/100). Through checking 'hardinfo' and 'sudo lshw -c network', it appears that my machine might have a gigabit interface, but I'm not sure. This is the output from lshw:
*-network
description: Ethernet interface
product: AR8121/AR8113/AR8114 Gigabit or Fast Ethernet
vendor: Atheros Communications
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: b0
serial: 00:24:8c:3f:3a:ba
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=ATL1E driverversion=1.0.0.7-NAPI firmware=L1e latency=0 link=no multicast=yes port=twisted pair
resources: irq:44 memory:fbfc0000-fbffffff ioport:ec00(size=128)
This is a bit confusing - the "capacity" heading above indicates the Ethernet is 10/100, but the Atheros Ethernet interface is given as "AR8121/AR8113/AR8114 Gigabit or Fast Ethernet" (confirmed by 'lspci'), which I guess means it can act as either gigabit or 10/100.
Assuming that all this means I do have a gigabit Ethernet port on my netbook: will the Arch system make automatic use of the extra speed, or do I need to issue any commands, change any settings, recompile the kernel, etc.?
Many thanks :-)
Tim

If it were a Gigabit NIC, it would simply be "AR8121/AR8113/AR8114 Gigabit"
Seriously, if the driver is working properly, 100Mbit/s is what you have got. You can check again with
ethtool eth0
which lists the supported device speeds.
Last edited by lolilolicon (2012-01-12 11:21:30)

Ethernet Port Software Issue

A few weeks ago, I noticed that my ethernet port was not working. It would not recognize when a cable was plugged in. This came along with a startup issue, so when I took it into the apple store to have it looked at, they replaced the logic board. It fixed the startup issue, so I assumed that it fixed the ethernet issue. I have now realized that it didn't. So I took it back to the apple store and they booted my computer from a separate drive, and the ethernet port worked just fine. So, the genius told me, the port problem is a software issue. He told me to reinstall leopard and that it should fix it. It didn't. So my ethernet port is not working because of a software issue. Does anybody know where to start? Thanks!

One way to test it is to configure it via the Unix back end. From a terminal window (you have to be root to do this, or prefix every command with sudo):
ifconfig en0 192.168.16.12 255.255.255.0 up
route add default -net 192.168.0.0 192.168.16.1 255.255.0.0
Substitute your own numbers for the correct addresses and subnet mask. The address on the ifconfig line is for your ethernet interface. The one in the route line is your default gateway.
Then type:
ifconfig en0
and it will show how the ethernet port is configured. Be sure the address and subnet mask are correct.
netstat -r
and it should show the routing table, including the default route you added, bound to the en0 interface.
Then try using the network. If it works correctly, it's a software issue.

Ethernet port speeds on the new airport extreme

What is Apple's reason for making the ethernet ports on the new Wifi Extreme 10/100 instead of the now common 10/1000 Gigabit variety?

The most obvious reason is that Apple realizes that few home users would benefit from the higher speed when using Apple’s base station. Most users doing professional type work would be using a Mac Pro for example and most likely professional type routers, themselves quite different from consumer routers such as Apple’s base station.
My guess is that the next base station will have the higher speed. Methinks Apple rushed into the latest with “N” to keep up with the router competition, which is also offering “N”. I suspect the next iteration of the base station will have the higher speed.
Of course the higher speed is useful only for a LAN. Speed to the internet is governed by the ISP used. If you have a home LAN with only a few computers attached, you wouldn’t likely see much of an improvement with the higher speeds depending on how much you are transferring. For most home users, that is not very much for a given transfer.
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Gigabit ethernet connection to existing Airport wifi?

I have a new iMac with a Gigabit ethernet port. If I want to connect it with a gigabit ethernet cable to my 2010 Airport Extreme box, and therefore to my existing wifi network:
1) How do I determine if the Airport Extreme [802n (4th Generation)] is gigabit ethernet capable? Airport Utility does NOT tell me if it is 802.11n (Gigabit Ethernet) or 802.11n (Fast Ethernet).
2) Will the gigabit ethernet's INTERNET connection be faster on this iMac than on the other wireless-connected devices? In other words, is there a real internet advantage to using gigabit ethernet connection?

Does this mean a Mac on Ethernet can see all devices on an AE wifi network, including a USB printer connected to the AE?
Yes, wireless and wired devices are on the same network. Wireless and Ethernet are two doors that open into the same room.
Does connecting a Mac with gigabit ethernet prevent/replace a wireless connection?
The Mac can connect using either wireless or Ethernet, but not both at once. If you connect an Ethernet cable to the Mac, that connection will become the active connection.....assuming that you are using the Mac's default settings. If you want to use the wireless connection on the Mac, then you will need to physically disconnect the Ethernet cable.
I guess I'm asking about the advantages and disadvantages of connecting a Mac via gigabit ethernet.
Advantages......Faster speeds on your local network between network devices.....no speed loss up to 330 feet or 100 meters......and there are no wireless interference issues in a wire. A wireless signal loses speed the further it gets from the router and with any obstruction that it hits. Other wireless networks around you tend to generate noise that will also slow down your wireless signal.
Disadvantages....you have to run the Ethernet cable.

Will on-board Gigabit Ethernet ports on a Cisco 3845 support a 100 Mb SFP?

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