Cisco 3750x no ethernet connection

Hi,
I seems to have a weird problem whereby clients are unable to get an ethernet connection (Port no LED lit/not connected) when using mac. Sometimes there is connection after multiple insert/disconnect using the same cable to the Mac client. This has also be tested with a direct connection between the client and switch (without going thru the backbone cabling). If I was to try using Windows client, there does not seems to have such issue.
Further observation; from the switch; if a shut and no shut was performed on the port connected to the client, it would cause the connection to be "UP". Not too sure if anyone may have seen similar issues of unable to get connection "UP"? The firmware on the switch is running 15.2(1)E2.
Any suggestion is appreciated.

You've got a 3750X? Good. This means you can test the cable run using TDR.

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Connect cisco 3750X and Dell N4032F

Hi,
I need to connect 2 diferent networks (192.168.x.x vs 10.44.x.x). this connection will be temporal because network 192.168.x.x will be migrated to 10.44.x.x.
On one side I have a Dell N4032F (L3) and on the other side a Cisco 3750X. What I need is just visibility between them? Wich is the best way to do it.
Thanks

Hi,
On the 3750X, you need to configure the IP address on the interface connecting to Dell.
example:
config t
interface gix/x
ip address 10.44.1.1 255.255.255.0
no sh
Not sure what you need on the Dell side.
HTH

Unable to hard code the ports of cisco 3750x series switch

hello,
I have tried with hardcode to 1000 7 Full on the ports which are connected to another switch.
After changing the port to auto from one side of the switch port came up. Is there any solution to make port up when both sides are hard coded to 1000 & full duplex.
Simple Words:
Switch 1 --> Switch 2 --> Hard coded to 1000 & Full --> Down.
Switch 1 --> Switch 2 --> Auto on one end to Switch 1 --> Up.
Switch model:
Switch 1 Cisco 3750x (Gi Switch)
Switch 2 Cisco 3750 (Gi Switch)
Regards,
Ezra.

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Yes, it's possible without a straight through cable, enable auto/auto both sides. Otherwise you'll need a cross-over cable.
BTW, if your standard is hard coding copper gig ports, for speed and duplex, you might consider bringing your standard up to date. Copper gig standard went much further in how auto/auto is supposed to work. By disabling auto/auto, I believe, you're also disabling some error monitoring too. Generally, all the major players, e.g. Cisco, would recommend auto/auto for copper gig Ethernet.

DAC Cable to Cisco 3750x

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Dear All,
I have 5 cisco 3750X switches ,but only 4 switches coming up 5 switches i am unable to see .
Connection for the switch :Please find the attached snapshot for the stack data connection .
Also find the snapshot for the stack power connection .
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Dear Marvin,
Thanks for your reply.
is my connection provided in attachment for data stack are ok .
i login to Switch # 5 through console
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switch: ?
? -- Present list of available commands
arp -- Show arp table or arp-resolve an address
boot -- Load and boot an executable image
cat -- Concatenate (type) file(s)
copy -- Copy a file
delete -- Delete file(s)
dir -- List files in directories
flash_init -- Initialize flash filesystem(s)
format -- Format a filesystem
fsck -- Check filesystem consistency
help -- Present list of available commands
memory -- Present memory heap utilization information
mgmt_clr -- clear management port statistics
mgmt_init -- initialize management port
mgmt_show -- show management port statistics
mkdir -- Create dir(s)
more -- Concatenate (display) file(s)
ping -- Send ICMP ECHO_REQUEST packets to a network host
rename -- Rename a file
reset -- Reset the system
rmdir -- Delete empty dir(s)
set -- Set or display environment variables
set_bs -- Set attributes on a boot sector filesystem
set_param -- Set system parameters in flash
sleep -- Pause (sleep) for a specified number of seconds
type -- Concatenate (type) file(s)
unset -- Unset one or more environment variables
version -- Display boot loader version
switch: version
C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(58r)SE, RELEASE SOFTWARE (fc1)
Compiled Tue 26-Apr-11 06:59 by abhakat
switch: boot
Loading "flash:/c3750e-universalk9-mz.122-58.SE2/c3750e-universalk9-mz.122-58.SE2.bin"...flash:/c3750e-universalk9-mz.122-58.SE2/c3750e-universalk9-mz.122-58.SE2.bin: no such file or directory
Error loading "flash:/c3750e-universalk9-mz.122-58.SE2/c3750e-universalk9-mz.122-58.SE2.bin"
Interrupt within 5 seconds to abort boot process.
Boot process failed...
switch:
All other 4 switches i can see in stack but not these switches and also the status light for this switches is blinking green please provide your assistance .

Can I extend the number of ethernet connections

I want to use my airport extreme for both wireless and wired. Since there are only three ethernet connections can I expand the connections by adding a unit that has just more ethernet connections? If so which connection on the airport extreme would you use as the uplink to the switch?

can I expand the connections by adding a unit that has just more ethernet connections?
Yes, you could add an Ethernet switch. They come in 5-port, 8-port, 16-port, etc. versions. Buy a switch with a few more ports than you need at the present time, since they have a way of filling up faster than you might imagine.
Connect the Ethernet switch to one of the three LAN <-> ports on the AirPort Extreme.
Since the Ethernet ports on the AirPort Extreme will handle Gigabit speeds, make sure that you get a Gigabit Ethernet switch.
The computer/electronic superstore near you will have just what you need. Recommended brands are Netgear and Cisco.

Solution for Apple TV 2, Xfinity router, Ethernet connection and Home Sharing

I have read over the past week the problems people have been having configuring their Apple TV and Home Sharing. I was experiencing the same issues as others....until tonight. I finally got it to work with an Ethernet connection. Previously, I was only able to get it to work via wifi and home sharing would drop after awhile.
1) Xfinity router settings. Like others I was suspicious if the Xfinity router was causing the issues because of the separation between wifi network and Ethernet network. It's not the router problem. I disabled the firewall. Enabled port forwarding. Gave a static IP address to the Apple TV. Added forwarding of ports
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DMZ is off
Device discovery is disabled
Port triggering is disabled.
The wifi is setup and functional using DHCP. Lease time is 1 week.
RESET ROUTER AFTER ENTERING CONFIGURATION.
2) Mac computer. As of this posting the latest version of iTunes installed. Latest Safari version. All programs updated. Turned on Home Sharing. Turned off firewall. Gave Mac a static IP address. Set Mac for hard drive to never sleep. Set monitor to sleep after 15 minutes. Set date and time to automatically find based upon time zone. ( Apple TV needs to be set to the same time zone as computer and set to manual). Enabled file sharing amongst users on Mac.
3) Apple TV. Ethernet connection. Configured TCP/IP to static IP address I configured on router for the Apple TV. Turned on AirPlay. Set date and time to manual and set as the same time zone as the computer with iTunes. Turned on Home Sharing. Using latest version of Apple TV.
Once the router was reset ( not restored and not just resetting the wifi. A complete router reset), the Apple TV found my iTunes library. It's been running now for over an hour and no drop in the home sharing. Working beautifully. I will be testing in the next couple days allowing the Apple TV to sleep, turning the firewall on the router to a minimal setting to see if it changes anything.
Just tested the AirPlay from my iPad 2 to the Apple TV while the Apple TV is connected via ethernet connection and it works. At this point it appears that the setup is correct and complete with no errors.
As a side note, the Ethernet connection between my router and Mac is via commercial devices using the power outlets as the wiring.
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spma3,
Appreciate your further message. As you say "it's not fixed", but at least your solution appears to be a viable workaround!
My Cisco RVS4000 Router will permit me to forward ports for up to 15 applications. Of these, thirteen already have default entries added, although none of these are presently Enabled. For example, here's just 2 lines...
Application           HTTP        NTP
External Port          80           123
Internal Port           80            123
Protocol                TCP          UDP
IP Address            No entries at both
and the Enabled box for both is unchecked. In fact none of these 13 possibilities is Enabled.
To do what you are advising, I would need to...
1) Enable the above Port 123 entry, changing it from UDP-->TCP.
2) Add new entries for 3689 UDP & 5353 UDP... using the two free slots at the end of the table.
3) Select three of the default entries, and reconfigure them for 80 TCP; 443 TCP; 53 TCP, all as per your guidance. And Enable them.
Now, my present setup here has...
1) My PC is wired straight to Port 2 of the Router, and has a Static IP Address set.
My new ATV2 is hard-wired into the same subnet, albeit thru a series of switches, and again a Static IP is set. My understanding is that hard wiring an ATV automatically disables its WiFi.
3) My wife's iPad2 is set for DHCP, so it can pick up an IP Address when on the move. It connects into the LAN using one of two WAP4410N Wireless Access Points. Ch-1 & Ch-6, with same SSID and security stuff set up on both. The WAPs in turn are wired in, again with Static IPs set. So depending where she is in the property she can connect with excellent signal strength, reaching the ATV2 by WiFi+LAN.
On the Router DMZ is OFF, Port Range Triggering has no entries, nothing is Enabled, so is OFF. No idea about Device Discovery!
Home Sharing is ON for the PC, ATV2 and iPad2, with the same Apple ID/Password set for each. It does work, just not consistently as it should.
So to fully implement your idea, all I need to do is to enter these details. But I am unclear which IP Address I should put in at each new Single Port Forwarding entry field. Certainly not the iPad2, as its DHCP allocated value will change. Is it the ATV2 or the PC? Not sure, please clarify.
BTW, I have no plan to deactivate my AVG Firewall on this PC. It is happy to pass all traffic related to iTunes, so cannot see this as a factor. Time zone same on all equipment.
I tried with just 3689 UDP and 5353 UDP yesterday, and things were definitely better. I used 192.168.20.227, the IP Address for the ATV2.
Look forward to your answer.

WLC 4402 Ethernet Connections?

Hello All,
What type of Mini-GBICS should I used for RJ45 ethernet connections for my 4402 Wireles Lan Controller? Should I use the GLC-T SFP? Is it the right one? aAso is Mini-Gbics a industry standard which means I can use any brand of Mini-GBIC for this Connection like Dell Brand Dlink or Others.

GLC-T is what you want to use. I don't know if other brands work but I bet it's not supported.
Sent from Cisco Technical Support iPhone App

Ethernet Connection Randomly Dropping w/ AirPort Extreme Router

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FiOS ISP (always been reliable in the past) -> AirPort Extreme (router) -> Cisco gig-e switch (reliable) -> 2008 Mac Pro running Snow Leopard (no I do not use wifi) (my computer) -> Internet sharing to my brother's computer via ethernet port 2 (set up after the new router was installed, but problem happened without it)
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Try the basics first:
Change your router channel number. Most times this works & is all you have to do.
Disconnect & reconnect your modem. unplug it for about 10 seconds. Plug it back in. Do the same for Apple’s routers. Wait for everything to reboot.
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Research Knowledge Base for network problems that pertain to the OS that is currently installed on your computer. See these basic networking KB Articles: http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
============================
What to do when you can't connect to the Internet
Also, run the Airport Utility app which is located inside the Utilities folder.
=====================
If using a Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.

How do I setup Airport express with ethernet connection to my modem?

Hi there - hoping to get some helpg as I'm having challnges setting up my Airport express via ethernet cable connection directly to my router. It will setup wirelessly no problem, but I occasionally get dropouts when streaming music and I'm hoping to remedy that with a direct cable connection. I know I have to change some settings in my airport utility, but haven't had any luck getting it right.
Here is my setups if it helps:
Airport express, 1st generation, model A1264
Cisco router (provided by my intenet provider)
Macbook Air, running 10.8.5
Airport utility version 6.3.1
Thanks!
Phil

Unfortunately, you are getting incorrect advice here. Might be a good idea to start a new post, since the original thread is long out of date.
First, please confirm that you have a compatible Express with the AirPort Extreme. This would be either the current A1392 version.....or the previous A1264 version.
Next, we need to confirm "how' you want to extend, since you do not mention this in your post.
Are you planning to "extend" by connecting the AirPort Express to the AirPort Extreme using a permanent, wired Ethernet connection (highly recommended).....or.....are you trying to "extend" by having the Express try to connect wirelessly to the AirPort Extreme?

Cisco 3750X -- 10G uplink - Can be used as access port?

Dear All,
I have small question, I am planning for Cisco 3750X with 10G SFP+ service module. I want to know that whether it can be used as Access Ports connecting to server as this is mostly used as uplink port.
Thank You,
Abhisar.

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Well if you want to connect anything with 10g to a 3750X, you're limited to using a module with 10g ports.
Other than 10g capability on some module cards, something to note, the module ports, I believe, are supported by larger buffers (including the gig module ports).
As the others have noted, you can use any port for any purpose. However, if you connect a server to a 10g port, be aware you might start to see drops on your other host (gig) ports as the server will now be able send faster than the host port can receive data. To minimize this, you might either disable QoS on the switch (providing maximum buffers to all egress traffic) or you might need to tweak buffer resource settings (the default settings often drop some packets, when there are bursts, of default marked packets).

Native VLAN on Cisco 3750x vs Cisco 2960S

Hi,
I have a scenario where I connect my Cisco switch 2960s with Cisco router 1941 as photo below
My question is when i connect router with cisco 2960s I config interface Gi1/0/1 as a trunk. everything work fine, I can ping from router to switch(172.16.29.2).
But when I changed to cisco 3750x, i config interface Gi1/0/1 as a trunk, it cannot ping from router to switch(172.16.29.2). But after I add native vlan 30 on interface Gi1/0/1 I can ping from router to switch (172.16.29.2)
Any idea why ? is there any different of native vlan on cisco 2960s and 3750x ?
Thank you for your kind answer
John

Hi John
It seems for me that the 3750 is doing what it should do, if the router do not have subinterfaces and dot1q, it will send traffic without dot1q tag, and the 3750 will drop these packets because they arrive without a tag. That's why native vlan fixes the problem.
The 2960 should work the same way that 3750 do, so I wonder if there is some differences in the config between the switches.
Can You share the config for gi0/1 on the router and also the switchportconfig for both switches.
Also a "show interface gi1/0/1 switchport" for both switches.
/Mikael

Is power supply 3k-X 715W AC hot swappable on Cisco 3750X?

Is power supply 3k-X 715W AC hot swappable on Cisco 3750X?
Thanks
Diego

Sorry, found the answer http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/hardware/installation/guide/3750x_3560x_HIG/HIGFRU.html
The power supply is hot-swappable. In some configurations, such as full PoE+ or power sharing mode, removing a power supply causes powered devices to shut down until the power budget matches the input power of a single power supply. To minimize network interruption, hot swap the power supply under these circumstances:
–The switch is connected to an XPS 2200 and sufficient power is available.
–The switch is in StackPower mode and sufficient power is available (Catalyst 3750-X only).
–The switch is powered by other switches in a power stack, and no active backup is in progress.
For the switch commands for displaying the available power budget, see the Catalyst 3750-X and 3560-X Software Configuration Guide.

Can iPhone have a wired ethernet connection?

There are places where there is a wired ethernet connection available but no wireless available.
Is there a way to connect an iPhone to a wired ethernet network?
Thank you.

Thank everyone for their help.
As I mentioned before, sometimes clarity is missing.
I realize that there are no "Apple Networks". What I should have asked was "Will an Airport Extreme when connected to a non-Apple modem/router provide a wireless signal that can be used by my iPhone" - and my MacBook Pro, and my ...
There are literally hundreds of posts both here and on other Apple Discussion boards that warn/advise against using a Cisco/Linksys/Belkin/Buffalo/whatever product in the network chain (wired or wireless) with Apple products.
I am not attempting to say whether these concerns/difficulties are valid or due to a lack of experience. I am just asking, and appreciative of the response that "YES" an Airport Extreme connected via a CAT 5 cable to an old Linksys switch will work.
As someone who has suffered/struggled for years with network problems I understand the pain.
And for those of you old enough to remember --
Thankfully I did not ask "Can I connect my Iphone to the Orange Micro SCSI card on my Motorola Starmax 5000"
Thanks again to all who helped.
I've ordered an Apple Extreme and will have it surgically implanted in my excessive adipose tissue with a tattoo reminding everyone that before I have an MRI, and take off my watch and my wedding ring, that maybe someone on the medical staff should take a look at their WiFi reception.

Cisco 3750x no ethernet connection

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