Catalyst 3560 GBIC Connection Drops

We currently have a Catalyst 3560G connected to a Catalyst 3750G via GBICs, and the connection will go up, and then a few seconds later it will go down. If the GBICs are reseated, the connection will go back up, but then go back down a few seconds later. The 3750G is connected to two other Catalyst switches via GBICs, and those connections are without issue. We have tried both GBIC ports on the 3560G, the other free ports on the 3750G, as well as swapping the GBICs between the 3750G and the 3560G, but we end up with the same result of the connection dropping after a few seconds. I will try swapping the GBICs with know working GBICs when we can afford some downtime, but I wanted to see if there is anything that can be attempted in the meantime.

Post the complete output to the command "sh interface <SFP interface>" of both ends.

Similar Messages

Gbic on Catalyst 3560

hi, I'm sorry for my poor English.
I have a problem to make some gbic modules work on a catalyst 3560: installing the gbics the catalyst tells me the following error: "_SECURITY_CRYPT-4-ID_MISMATCH: Identification check failed for GBIC in port 65585.". The installed IOS is the following: 12.2(25)SEB2 and the model of gbic it is: GLC-SX-MM =.
Thanks in advance for your attention
Regards

Where did you get these SFP GBICs from? It appears you have 3rd Party GBICs. To enable 3rd
Party GBICs, you need to configure it using hidden command "service
unsupported-transceiver"
Stack1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Stack1(config)#service unsupported-transceiver
Warning: When Cisco determines that a fault or defect can be traced to
the use of third-party transceivers installed by a customer or reseller,
then, at Cisco's discretion, Cisco may withhold support under warranty or
a Cisco support program. In the course of providing support for a Cisco
networking product Cisco may require that the end user install Cisco
transceivers if Cisco determines that removing third-party parts will
assist Cisco in diagnosing the cause of a support issue.

Catalyst - stratix gbic

Hi,
I ran into a small problem the other day that I'd like to get some feedback on.
I was connecting a Catalyst 3560 switch and an Allen Bradley Stratix switch via Fiber with LC Connectors. I couldn't get the ports to light up and kept getting "High Power" errors on the stratix end. (I didn't pull the exact logs).
On the catalyst end, I was using a Cisco Branded GBIC.
On the Stratix end, I was using an Allen Bradley branded GBIC.
I wound up putting a Cisco GBIC into the stratix switch and after that everything lit up all right.
Is there a stated requirement to have the same GBIC on both ends? Is there a best practice configuration that I should review to compare to my own?
This is our first time connecting the stratix and the catalyst via fiber, so I am just trying to do it right. ;-)

Maybe the Allen Bradley optic is of a different wavelength?

Media Converter & Catalyst 3560 giving me headaches

Physical location 1 is connected to Physical location 2 with fiberoptic cable.
Location 1 fiber is terminated at Catalyst 3560.
Location 2 fiber is terminated at a media converter, so that the fiber link should be able to transparently be connected to a gigabit ethernet by rj45 cable.
The two fiber cables at each end is the same (62.5/125) - all is multimode fiber, and the gbic in the catalyst, and the media converter are both 850 nm.
On the Catalyst gbic where the fiber is, no link.
On the media converter there is link on the rj45, but no link on the fiber.
I cant seem to get what could be the problem.
The media converter is a tp-link mc200cm, which is gigabit, as well as the gbic module in the catalyst.
At first I bought the wrong tp-link (mc100cm - wavelength wrong) - however, on that, the fiber link lights (but very quick flashes only).
Any help, pointers oir the like would be greatlty appreciated!

It would seem the two devices should be compatible; both 850nm, short-reach interfaces and the instructions for the media converter shows a single-ended configuration. In the past, others have found that some media converters only operate in matched pairs; typically meaning they are not 802.3 compliant on their fiber links.
Have you confirmed that the fiber connectors are clean and the fibers are routed to the correct ports (Tx to Rx, and Rx to Tx)? Are the ports set on both devices for Auto speed and duplex setting? Have you tested the fiber links to ensure they are good? If you loop the fiber cable on the 3560's GBIC from Tx to Rx, can you get link? At the media convertor end, disconnect the fibers and connect the fibers together; does the 3560 show link? If you loop a fiber at the media converter's optical ports, does the media conv show link?
Let us know. Thx!

CISCO CATALYST 3560 SFP INTERCONNECT CABLE

What is the advantage of using this SFP cable over a 1000BaseT GBIC and daisy chaining the switches together?
Just curious???
Thanks!

The advantage comes down to cost. Whether you can realize this advantage depends on the distance between the two Catalyst 3560 switches.
If the distance is less than or equal to 50cm, then one SFP Interconnect Cable (CAB-SFP-50CM=) at US$250 is a much less expensive way to connect the two switches than two 1000BASE-T SFP (GLC-T=) at US$395 each = US$790 plus a Cat5 or better UTP Gigabit Ethernet crossover cable.
If the distance is greater than 50cm but less than or equal to 100m, then the 1000BASE-T SFPs are your least expensive option. The alternative is MM or SM fiber.
If you have to connect a Catalyst 3560 SFP interface to another Catalyst switch that takes GBICs, then the SFP Interconnect Cable is not even an option. From 0 to 100m, 1000BASE-T SFP and GBIC (WS-G5483=) would be your least expensive way to go.
If there's any chance you will be redeploying these switches somewhere else in the future, you may want to put the 1000BASE-T SFPs in now. That way you'll already have them when you need them later.

Installing c3kx-nm-10gt module in Catalyst 3560-X-24T-L

I am attempting to install a C3KX-NM-10GT network module into my Catalyst 3560-X-24T-L switch. Any time I do this, the interface fails to operate, and the web-based status interface fails to operate correctly until the system reboots. When I connect using the CLI, it sees the 10Gigabit interfaces, but they will not operate when I connect a device. Utilizing the shutdown and no shutdown commands does not seem to affect the interface.
Current software version on the switch is 15.0(2)SE7 IP Base.
Any thoughts would be appreciated.

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
If it's not a license issue, then it's possible you have a hardware issue, with either the switch or the module.
BTW, you might be able to enable IPBase license, in a timed evaluation mode. If so, you could use that to rule out the license question.

Assistance Disabling BPDU Guard: Catalyst 3560 CG

Good Morning Guys,
Here's the situation:
Configuring cisco wireless bridges - every time I get both devices up in my wireless controller, the port my root bridge is connected to on the catalyst 3560 CG switch gets disabled with the following error:
"SPANTREE - 2- BLOCK_BPDUGUARD: Received BPDU on port, *** with BPDU Guard enabled, disabling port."
I've done some research on BPDU Guard and I've tried applying the following commands to no avail:
1. errdisable detect cause bpdguard shutdown vlan (global and config mode)
2. spanning-tree bpduguard disable (configuration mode at the interface)
any assistance to prevent the port from shutting down would be greatly appreciated.
Christian

You should double check the interface configs on both. It is shutting the port down because it is receiving BPDUs. This could be cause your switch port is configured for access but the WLC is configured as trunk...

Catalyst 3560 and MGBIC

Hi,
I would like to know if the MGBSX1 and MGBLX1 are compatible with Catalyst 3560 SFP ports (WS-C3560G-24TS). I'm looking to directly connect my fibers to my switch, but I couldn't find out the difference between MGBICs and GLC-LH-SM=, for example. Cause MGBICs are really, really cheaper.
Thanks,
Caio.

Yes the MGBIC is cheaper then the GLC-LH. Although made by the same group of manufacturers Cisco has inserted an IDPROM algorythm to check. The MGBIC doesn't have this value.
Cisco has put a stop to the enterprising practice of purchasing 3rd party (and cheaper) modules to be used in their equipment and then ring up TAC for issues with it.

BT Wi-Fi connection drops and cannot be closed

I use BT Wi-Fi on a monthly subscription - 500 minutes for £6 a month, plus 12p a minute for any extra minutes.
Occasionally my connection drops, and I have to reconnect and login again, which I can do OK.
But when I check later how many minutes I used, via my online subscription info, it's clear that I end up with two connections running in parallel. The connection which dropped carries on as active in the background somewhere until it is eventually auto-disconnected (after 15 or 20 minutes ?) due to inactivity. So I lose those minutes each time this happens.
There is no way to close the dropped connection. Even if I log out of my new 2nd connection, it only closes that one, not the dropped one which I can't access.
Today this happened when I was at the end of my monthly allowance, so because I couldn't close the connection I've now gone around 30 minutes over my allowance, which will cost me £3.60.
Please can we have a way of closing all connections on a BT Wi-Fi account, to deal with this issue.
And a refund would be good, as I had no way of preventing my account going into the 12p a minute rate.

this is a customer help customer forum and your posts do not go to BT
have you tried the helpline 0800 022 33 22
If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post.
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

Internet Connection drops when incoming telephone ...

On 14th December 2011 during a period of very high winds and heavy rain an incoming telephone call caused the internet connection to drop and it eventually restored itself after about 2 hours. When I answer a call the internet connection drops after about 30 seconds and then reconnects after about a further 40 seconds. All incoming local calls cause the internet connection to drop. As far as I can tell incoming calls from other exchanges seem to be OK. Incoming calls from mobile phones sometimes cause the internet connection to drop. The line is unaffected by outgoing telephone calls. I have a BT HomeHub 2B plugged into an upstairs telephone socket and connected by ethernet to my PC. I have another telephone socket downstairs, each socket is fitted with a filter. I have have tried every combination of my two standard telephones and 4 filters in each socket and every local call causes the internet connection to drop and reconnect. I think it very unlikely that both phones and 4 filters have become faulty at the exactly the same time. I have connected the Home Hub and telephone with a filter to the test socket and asked a friend on the local exchange to call me and the internet connection dropped and reconnected as before. Since moving to this house 2 years ago I have had four previous interruptions to the broadband service all of which were caused by problems probably at the exchange. The last one took 8 days to correct after countless calls to the "Help Line". Their fall back position is always to assume that there is no problem with the BT line. So I am not even going to try to explain this over the telephone. This is the information on the BT Home Hub Event Log, it is typical for every occurrence of the problem. Dec 26 11:42:42 2011 ERR 2011-12-26T11:42:42Z cwmp: mt_cwmp: session error: Could not resolve host Dec 26 11:43:19 2011 (1035438.010000) RTNL: Received ERROR reply 'No such process' for message type 0x19 Is this a problem with the Homehub, the line, or at the exchange?

not sure I read your post correctly but are you saying if someone from another exchange phones then the broadband is ok and it only drops if someone from your own exchange phones?
if the possible sollution from chris6273 does not work, and you have already tried the test socket then I would contact the mods for assistance http://bt.custhelp.com/app/contact_email/c/4951
the mods can take up to 3 days to reply
If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post.
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

Internet Connection Drop Outs when remote administ...

I did not want to trouble anyone here if I thought it unnecessary but now I feel that I do need some assistance so this warrants opening a new thread.
BT Infinity Option 2 customer with BT HH 4 and its separate modem - not hacked so cannot read any useful information or login to see what is going on and both BT and the manufacturer long ago removed the open source code of the modem.
I am quite confident now that these disconnections happen when a remote server/attacker attempts to gain access to my network. These can be from China, Iran and other places too. Sometimes Ministry of Defence? I don't know why I get these connection attempts and most of the time I see BT HH 4 does block these so why I get disconnected I have no idea?
I made a post in an old thread before opening this thread and said it was due to firmware upgrade but I misread the date! It was not updated since the 8th of May I think. These disconnections have been happening only this past 4-7 days with the most 4 days with intensity greater than the 3 before. I am not 100% certain it is caused by the remote administration that is blocked.
What happens when this takes place is the BT servers are then unreachable sometimes and I cannot regain a connection for up to 3 hours at a time, usually it is 5-10 mins max though. Without looking at my event log, any ideas?
I want to get different gear now and never wanted to use BT equipment anyway because I want greater control and options to configure. I would like to go with DD-WRT or OpenWRT Router with Integrated VDSL v2 modem. Anyone here that may suggest one that supports either of these open firmwares? Not so much the concern to prevent any security holes or backdoors but just as much if not more for versatility and configuration and just having control over my network. being able to do upgrades when I want and not when my ISP decides needs doing. And before you say BT do not have backdoors then why would they admit they can remote login to devices and storage contents with their pwerline adapters even. I remember reading a news article quoting BT as admiting this. Anyway, that is not my main concern here, as much as privacy and security is not a crime it is rather rare online. First I need to get to the root cause of this.
BT HH 4 is not reporting any DDOS attacks and even if it were I would not expect to experience any disconnection. I used to get tons of floods from DDOS attacks years ago when using Netgear routers and never exeprienced any downtime, but that was with another ISP. I don't detect any malware or anything like that and rarely download anything on this machine, I know web browsing can infect a system but I don't think that is it.
I want to go back to how I used to do things. Any help with this is appreciated. I will need to get my router login details because I was never given those when I singed up with BT Infinity Option 2. I don't even know what my BT email is but do believe there is a way to recover that under my account. **In the past we have had intermittent connection drops and loss of sync but this is not the same right now.
Edit:
** Just to clarify that was before we upgraded to BT Infinity Opt 2. This is the first time any probs with this service since upgrade and that must be about 6 months or more now.

When running BT HH diagnostic it printed out that the username for login had changed and needed resetting or for me to enter my own in that I was NOT given! Anyway, when going to select manual reset it had not changed from default at all so I think this is just some default BT diagnostic that is false. I realise that other BT customers are affected by this with the BT HH5 but mine is HH4...my posting probably isn't as clear right now as I have not slept as much past few nights trying to figure this out. This is happening at different times of the day but more often during early hours.
So I am getting these WGET TLS error(s)
How do I enter in log excerpt from BT HH? Forums says my post exceeds 20K chars...

Internet connection drops with new HH4....

I recently signed up to a new deal with BT and had to pay for my HH4. I have it all connected up the exact same way as my HH3. I am receiving a faster connection now but am now getting VERY frequent internet connection drops....
My PC is wired to the HH so NOT a wireless issue. I have checked ALL my microfilters and seem to be working. Nothing within my home has changed apart from the homehub. I used to be connectiong at around 6.5Mb, I am now connecting between 7.5 and 8Mb....
9 times out of 10 the connection drops when I receive an incoming call.... but not always. I can make outgoing calls with ZERO issues....

Shand359tbe wrote:
I forgot to state also that I since removed the HH4 and put my old trusty HH3 back into use......... it does the EXACT same thing now.........
BT engineer was out to fix the line in February of this year. A new main box was fitted (which I was billed for) and he also fitted an iplate to the box to allow the hub to be connected without the need for a filter since they are built in.......
an Iplate will not do away with any filters and they will be required on all sockets - unless you mean a filtered faceplate not iplate - 2 sockets 1 adls and 1 phone
If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post.
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

My Internet Connection Dropping Issues...

I too am having the occasional Internet connection dropping issues. Phone and TV continue to work.
Since I had Fios installed last November I am on my third ONT and 2nd router. When I called in my latest drop yesterday the call center person told me I had a hardware issue because my computer had a valid IP address assigned. I tried to teach her something about DHCP but she would not listen to me. I asked her to please reboot the ONT and she refused because "nothing was indicating a problem with it". Whatever...
Each time the Internet goes out the router acts fat and happy. I have full green on WAN Coax, and strangely enough, a flashing green Internet activity indicator. Logging into the router shows that I am MOCA connected and assigned a WAN IP address. But I can't get out past the router at all. On the event that led to me getting a replacement router the lady said she could talk to the ONT just fine, but not the router. We reset the router and ONT port numerous times and the connection finally came back up.
I am not sure of the protocol between the ONT and router, but I think the ONT is keeping enough signal going to make the router "think" its happy, but then the ONT is not passing packets at some point. After yesterdays call and the refusal to reset the ONT I just hung up on her and reset it myself. Of course everything started working just fine...like I thought it would.
So what is the issue here? Is MOCA a mess? Is an Ethernet connection to the ONT better? I am utterly disgusted with this miserable system and can't afford to continue having these outages.
I should also add the other wonderful features I have seen. When I tried to powercycle the *new* router yesterday it decided to dump its entire config including my port forwarding. Nice... And I have given up using wireless because if I set the router for WPA it locks up so hard that it takes a master reset to get going again.
Anyone have some advice on getting this system stable?

I would try using a non-verizon router. I used the Netgear router and it fixed my problem. The Verizon router seem to be pieces of garbage and they over-hear.

Connection drop iMac to Apple TV - OSX Lion

Hello.
Hope someone might have a solution. Ever since i changed to OSX Lion i have had a really irritating bug with my Wifi. While browsing, downloading and doing everyday stuff my connection is fine.
However when streaming movies and tv-shows to my Apple TV (2nd) i have been getting som nasty connection drops. Its not always but to often to be anoying since i havnt had this problem before.
Scenario: I can start a movie and watch almost an hour when all of a sudden the connection drops on my iMac Late 2009 - OSX Lion 10.7.3. Everytime this happens my Wifi icon turns gray and i need to shut the Wifi off and turn it on again and all works. But once it has started the connection drops every 10 min or so and i need to reboot the machine to be able to watch the movie like "normal".
The connection between my Airport Express and the Apple TV is no problem and works flawless but my Mac cant seem to handle the "heat". I didnt have this issue on SL so im a bit bugged about it.
RSSI: -45
SPEED: 130
This is what ive tried.
1. Repair the permissions thru the OS, and the Command and R at start up, including the "resetpassword" thing.
2. Update firmware on my Aiport Express and downgraded since it just got worse.
3. Updated the airport utility, but needed to install back the old one since the new for Lion doesnt support the switch between 2.4 and 5.0 band.
4. Reset PRAM
5. Reset SMC
6. Rebuild the connection by deleteing and resetting the router.
7. Done some cleanup with OnyX.
Now im out of ideas since nothing seem to work and i hate that i have all this Apple gear for thousands of dollars and the f**** Wifi ruins everything.
Anyone?
Cheers
Chris

I have the same issue

Home hub 3, broadband connection dropping

Hi, just a few days ago I recived my new home hub 3. The reason I wanted the upgrade from the hub 1 is because the broadband connection would drop and also the old hub would reset it self constantly.
The new hub is much better in terms of not resetting itself, if i try and watch something on 4od etc, youtube, it feels like any stress and the braodband connection drops, I had this on the old hub but it feels like its happening more now.
So much so I decided to make a paint version of my wiring so someone can maybe help me out.
http://i144.photobucket.com/albums/r173/guysy1110/routerproblem.png
Sorry the paint image came out much smaller than I wanted.
The main phone line is dowstairs in the lounge, its split into 2 using a 2 way splitter, one goes to the main phone which has a microfilter attached, the other plug leads up to the spare room and there a phone box (sorry not sure what its called) is in place, this box was split into another one because a long time ago there was a router that lived in the spare room (the split box is unused). Probably confusing people now, but the main box upstairs in the spare room is extended into my room and then a microfilter is used and then goes into the hub.
The extension cable is FAR too long, possibly 10m of cable wound up and tucked behind the drawers. Could this be a problem? I guess so.
So my main questions are, if both the router and main phone have new microfilters on, what other causes could keep my router dropping the broadband connection? the extension into my room is FAR too long possibly 10m which is wound up behind my drawers, first off im going to get a shorter cable.
Also the microfilter is closest to the hub, would it be better at the first source downstairs, or even in the spare room?
Any suggestions would be great. thanks.

Im reviving this thread, so far from the phone box upstairs Ive shortened the cable, It still goes into my room but now instead of having a ridiculous 15m amount of calbing unused Its a straight 3m from the other room to mine.
This has slightly improoved things.
However the hub still suffers and drops the broadband connection when under "stress" when the phone rings it sometimes drops, and when downloading files it drops halfway through if the file is large which is a massive pain.
On the downstairs master socket I removed the facia and did a quiet line test on the inside socket, there was no noise. I used a corded phone. I wasnt sure if it mattered but I tested all other sockets using this method and none had any noise.
I phoned BT and was advised to take the hub closest to the master socket, but if i do this I have no wireless card in my PC so cannot connect, The obvious option is to get a wireless card but that will cost money. As will buying the power lines.
Any suggestions? I guess plugging the hub in downstairs and trying to connect to something is the best option.
Any advice please?

Catalyst 3560 GBIC Connection Drops

Similar Messages

Maybe you are looking for