Half to Full Duplex

I am looking at an ASA5510 that is using the management port for several VPN connections. It has connected at 100/HD and I am not sure what will happen if I start trying to force that to full-duplex. Will this take down the port? Will it cause any of the VPN connections to drop? Unfortunately, this is a live box and an outage would not be good.
Any help would be appreciated. Thanks.

Will this take down the port? Will it cause any of the VPN connections to drop?
Changing port transmission settings on any live port either on asa or switch or router will bring down the port for few ms and brought backup quickly..but connections most likely will be dropped and will required to reconnect.
suggestion is to make port changes during non-production hours.
Regards

Similar Messages

NIC Settings: Changing between half and full-duplex

issues connecting to a wireless router..
keep getting 169 (self assigned ip)
the last suggestion i got was to check that the nic was set to 10/100 half-duplex.
i have no idea how to check it or change it.
please.. any help would be greatly appreciated.

Hi, and welcome to Apple Discussions.
What brand and model of wireless router are you trying to use?

Half duplex or full duplex configuration for MDS9124 management port?

Hi All,
Is it possible to set the management port of mds 9124 about half or full duplex configuration?
I want to correct following error:
Jun 13 10:27:20.799 GMT: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet4/18 (not half duplex), with mtw1pc02bs0(FOX1450G8QG) mgmt0 (half duplex).
it seems mds 9124 set his port to half duplex.
Dennis

You may want to check this thread :
https://supportforums.cisco.com/thread/2059109
Else try the following :
switch# config terminal
switch(config)#
switch(config)# interface mgmt0
switch(config-if)# switchport duplex full
switch(config)# exit
switch#
switch# copy running-config startup-config
Also, I would suggest you check what the counterpart of your MDS switch mgmt interface is set to (i.e. is it set to autoneg, then try setting it to fix speed/duplex or the other way around).

10.6 update disables full duplex ethernet

Updated to 10.6 and immediately lost all internet connectivity. Network control panel reported "Cable Unplugged."
Restarted in 10.5.8 -- 100Mb connection worked fine.
Restarted again and back in 10.6, I fiddled with settings and found that by manually switching to "half-duplex" ethernet (under the "advanced" tab) internet connectivity returned. (Connectivity also resumes if I choose the "automatic" configuration, because that too switches over to half-duplex). Either way, the working connection seems a noticeably slower than 10.5.8, which I assume is the difference between half and full duplex.
Any ideas on how to restore the connection to full duplex?

Thanks for the tips
It is looking more and more like a driver issue with the Intel Pro 1000 card that came with the Mac Pro. I've found people with similar loss of full duplex with this card (sometimes unrelated to Snow Leopard).
Intel no longer supports the card or driver apparently, having sold that operation to www.small-tree.com. SmallTree's Web site states that a problem exists with the driver and Snow Leopard and offers a possible work-around at http://www.small-tree.com/gigabit-ethernet-driver-download-a/198.htm.
(The driver must be installed with the current ethernet card removed. Unfortunately, every how-to guide I've seen assumes you're replacing the easy-to-access PCI cards, but the preinstalled Mac Pro card appears to be hidden back behind the main fan and I don't see an easy way to get to it.
Am I missing something obvious?)

Forced Full Duplex changes to Half Duplex (no mismatch errors)

Guys,
I am going through a very weird situation and wondered if any of you had any ideas on how I could troubleshoot this issue.
I am running a 2960 Cisco, which has a single mode fiber cable which is connected to multiple rstp switches designed by a mining technology company.
The fiber port which connects these switches has "duplex full" written into its configuration. However, after a random amount of time, anywhere from 1 hour to 24 hours, the port is changes to operate in half duplex. This is found by doing a show interfaces status.
At no time whatsoever is there any duplex mismatch errors.
Once i notice that the port is actually operating in half duplex mode, i log into the port, do a "duplex half" then "duplex full".. the port goes back into full duplex for another 1-24 hour period.
Any ideas on why this port keeps jumping into half duplex operation?   I really need this port to run in full duplex and cannot understand why the port would go into half duplex operation when the end devices should support full duplex.
Again, i never get any duplex mismatch errors.
I appreciate any troubleshooting tips you can provide.

MSTswitchOVCC#sh version
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(53)SE2, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Wed 21-Apr-10 06:08 by prod_rel_team
Image text-base: 0x00003000, data-base: 0x01B00000
ROM: Bootstrap program is Alpha board boot loader
BOOTLDR: C2960S Boot Loader (C2960S-HBOOT-M) Version 12.2(53r)SE, RELEASE SOFTWARE (fc3)
MSTswitchOVCC uptime is 1 week, 6 days, 37 minutes
System returned to ROM by power-on
System image file is "flash:/c2960s-universalk9-mz.122-53.SE2/c2960s-universalk9-mz.122-53.SE2.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
[email protected].
cisco WS-C2960S-24TS-L (PowerPC) processor (revision B0) with 131072K bytes of memory.
Processor board ID FOC1435W6KX
Last reset from power-on
4 Virtual Ethernet interfaces
1 FastEthernet interface
28 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : AC:A0:16:F3:EF:00
Motherboard assembly number     : 73-11910-06
Power supply part number        : 341-0328-01
Motherboard serial number       : FOC14354WTE
Power supply serial number      : LIT142210AX
Model revision number           : B0
Motherboard revision number     : A0
Model number                    : WS-C2960S-24TS-L
Daughterboard assembly number   : 73-11933-04
Daughterboard serial number     : FOC1435437G
System serial number            : FOC1435W6KX
Top Assembly Part Number        : 800-30954-02
Top Assembly Revision Number    : A0
Version ID                      : V02
CLEI Code Number                : COMGG00ARB
Daughterboard revision number   : A0
Hardware Board Revision Number : 0x01
Switch Ports Model              SW Version            SW Image
*    1 28    WS-C2960S-24TS-L   12.2(53)SE2           C2960S-UNIVERSALK9-M
Configuration register is 0xF
MSTswitchOVCC#

Mac Pro 10.6.5 100baseTX Full Duplex Not Working

Hi Guys,
I am having some trouble with the Mac Pros that I support in my office (Early 2009 Model). Our network uses 100baseTX Full Duplex on all of our connections in a mixed PC/Mac environment. This was working perfectly fine until we updated our Mac Pros to 10.6.5 (Went straight from 10.5.6 to 10.6.5).
Every Mac Pro now has itself set to automatically detect the speed, and they keep setting themselves to 100/Half. If I go in and manually adjust it, setting it to 100/Full, I lose all connectivity to the ethernet (it doesn't even recognize that a cable is plugged in). This is causing a lot of troubles for our Mac users trying to access files on our shared drives. It is taking them about 5 minutes to download a 30MB file, rather than the 3 seconds it should.
I tried booting to our portable 10.5.6 drive and 100/Full works just fine. Our PowerMacs on 10.4.11 also work fine on 100/full. I tried using Cocktail and Sudo to force the change, but again the ethernet drops out. The problem persists through all user accounts on all the effected Macs. I have tried a fresh install of 10.6 and the problem persists. If I downgrade back to 10.5 the problem is gone. I know it is not an issue with the network because 2000 other machines are working just fine, and the affected ones work fine when downgraded.
I just spent a good hour on the phone with AppleCare, but after insisting it was a problem with our network for the first 45 minutes, they came to the conclusion that they simply could not help me. According to them, if I want networking help, I need to convince my company to spend $2,800 on their enterprise support, and even then they don't know if they will be able to help me. So, it looks like I am on my own here.
Anyone have any thoughts on what is going on or how to fix it?

Yalp wrote:
The only possibility that I can see is that it is a software problem on these Macs.
There is always a certain level of slack engineering into all these devices. When you start updating one part of a network, you risk exceeding the slack. It is always possible that the problem is with the router hardware or cabling. Certainly, the problem would be with 10.6.5 too. But if you jump to one conclusion or the other without troubleshooting you risk waiting forever for a fix that will never come.
So, what you have to do is connect these Macs to some other router/hub running 100BT/Full (with settings as close to default as possible) with cables that you know are rated at that speed. If that fails, submit a bug report to Apple. If it works, take your router/hub and put it in the network cabinet and connect it to the Mac Pro with the existing cable. If that fails, sue whomever installed the cable and redo it (network people sometimes try to save money with cable). If that works, look at the existing router/hub and see if it has any bugs or firmware updates available. At this point, you could submit a bug to Apple with precise details about your router/hub and also submit one to the manufacturer of the router/hub. Apple will either fix the problem or contact the router/hub manufacturer and get a fix. Once you know precisely what connection is causing the problem, there may be other ways to address it either on the router/hub side or on the Mac side.

Full Duplex Lost with Wave Files on SB Live! Value (W

Following a clean install upgrade from WinME to WinXP SP2 on a Dell Dimension 400 with an OEM-installed SB Li've! Value (WDM) PCI card onboard, full duplex wave audio (recording one wave file while playing back one or more other wave files) ups and disappears ? ME had it, XP doesn?t. The record side of software mixers I use on the XP OS (Quartz AudioMaster, NCH Swift Sound MixPad/WavePad) fail to acquire or record the wave signal(s) being played back by the mixer side of the application. Stand alone recorders (Roxio Easy Audio Capture, HotKey Sound Recorder) also fail to acquire or record the wave signal(s) being played back by the aforementioned mixers. But if I switch the record input to microphone during the record pass (on those apps that permit such midstream switching), the mic records without incident.
Creative?s Auto Update shows all drivers for the sound card are up to date. Applying Creative?s Knowledge Base Solution ID 645 passes all DXDIAG tests with no problems (text file results available if anyone cares to see them) but the manual test using twin Sound Recorders fails as the second copy (record-designated) Sound Recorder fails to acquire or record a signal from the first copy (playback-designated) Sound Recorder (no error codes display at any time). Clean booting WinXP and running the same record passes doesn?t rectify the problem.
Anyone know what?s going on here? And how to fix it's I?m stumped.
TIA . . .

For benefit of anyone who hits this thread in a search:
FWIW - Following 5-weeks of troubleshooting this problem with Microsoft Tech Support (including a parallel install of the XP SP2 OS), we reached the following conclusion: Since the OEM sound card (Creative Model CT4780) was known to operate in full-duplex mode without incident under my system's prior ME OS but the same card fails to consistently operate in full-duplex mode while running under a virgin parallel install of the XP OS, the source of my full-duplex problem must lie in the files and drivers resident on the XP OS CDROM and dropped to my system by the OS loader/installer. There really isn't any other plausible explanation. Absent its drivers, a sound card's nati've hardware state is either going to be full-duplex or it isn't - it would never be full-duplex sometimes and half-duplex (or simplex) the rest.
The problem was resolved when a retail, nearly identical, sound card (Creative Model SB040) and the drivers and files from its CDROM, were installed on the same system.
Perhaps, somewhere, drivers exist that will permit the CT4780 to operate consistently in full-duplex mode on an XP SP2 OS - but neither Microsoft, nor I, had any success in locating them.

Network board 10/100 full duplex

I have an issue with my system (solaris 8 sparc):
If I download a local file from a distant machine the file is going at about 100Mb. If I try to upload that same file then it is going at 10Mb.
I checked the cables etc but could not find anything.
ndd reports correct figures (100Mb and full duplex)
# ndd -get /dev/hme lp_autoneg_cap
1
# ndd -get /dev/hme lp_100fdx_cap
1
# ndd -get /dev/hme lp_100hdx_cap
1
# ndd -get /dev/hme lp_100T4_cap
0
# ndd -get /dev/hme lp_10fdx_cap
1
# ndd -get /dev/hme lp_10hdx_cap
1
Where should I look now?

Thank you for your help
With those parameters set, my bandwith is just worse so I came back to the previous configuration.
I tried hmeconfig (found on the web, a small perl script to display everything) and it showed:
hme0: using RJ-45 at 100 Mbps full-duplex
* RJ-45 Hardware supports: auto-neg, 100-full, 100-half, 10-full, 10-half
* Auto-negotiation is: ON
* Enabled modes: 100-full, 100-half, 10-full, 10-half
* Link Partner supports: auto-neg, 100-full, 100-half, 10-full, 10-half
with default values (nothing in /etc/system) and:
hme0: using RJ-45 at 100 Mbps full-duplex
* RJ-45 Hardware supports: auto-neg, 100-full, 100-half, 10-full, 10-half
* Auto-negotiation is: OFF
* Enabled modes: 100-full
* Link Partner supports: UNKNOWN - interface not in auto-negotiation mode
with the following in /etc/system:
set hme:hme_adv_autoneg_cap=0
set hme:hme_adv_100T4_cap=0
set hme:hme_adv_100fdx_cap=1
set hme:hme_adv_100hdx_cap=0
set hme:hme_adv_10fdx_cap=0
set hme:hme_adv_10hdx_cap=0
This sounds normal except that the second one is just slower for ftp exchanges.
I cannot understand this.

WAN Port Full Duplex

I have connected my UC540 latest software pack to a FIOS Box. i'm only getting half the speed.
Can someone post the steps on CLI to make the WAN interface full duplex please?

It would be `interface FastEthernet0/0` for a UC540 actually.
In any case, I believe they are set to "auto" by default... which should have chosen full duplex.
From his description it sounds more likely that he has a throughput problem than a half-duplex issue.
How fast is your FIOS connection? The UC500's aren't really designed for very high speed WANs.
The other thing to check would be traffic shaping settings, if misconfiged, they could certainly limit your speed.
Dan
Please rate useful posts.

Not getting full duplex throughput on WRT54GL

So here's the situation. I am on a university network that gives us a 10Mbps HALF duplex connection when using auto-negotiate, so we effectively get a 1Mbps connection. I can manually change the duplex setting on my network card to "full duplex" and then I get a solid 10Mbps connection.
Now I am attempting to use a WRT54GL with this connection. I have configured the router for "full duplex," but whether I am connected through wired or wireless to the router, I consistently get only 1Mbps throughput. Is there any additional setting or hack I can do to force the router to use full duplex with its WAN connection to the campus network?
Thanks in advance!

This option is not available on the linksys firmeware..

Wireless with Full Duplex

Wireless with Full Duplex
according to my CCNP switch book, it says
IEEE802.11 WLANs are always half duplex because transmitting and receiving stations use the same frequency. To achieve full-duplex mode, all transmitting would have to occur on one freqeuncy, and all recieving would occur over a different frequency.
Although thi is certainly possible and practical, the 802.11 stadards do not permit full-duplex operation.
Can anybody explain this "certainly possible and practical " case?

Hi,
I believe that "certainly possible and practical" mean that it would be feasible to send in one frequency and receive in the other achieving full duplex.
This would require a new standard to define devices with 2 frequencies active that would negotiate which one to transmit, and stuff like that.
However, the standards the define the wireless networks were not design for that so they do not allow it.
HTH,
Tiago
If this helps you and/or answers your question please mark the question as "answered" and/or rate it, so other users can easily find it.

Full Duplex Collisions???

OK Im really confused. I thought you couldnt have collisions with a full duplex port but yet my switches are showing collisions even though they are set to full. Also I was told that some applications will not run right if the network cards are set to full duplex. Has anyone ever run into this?

William
Part of the definition of full duplex is that the collision detection mechanism is disabled on a full duplex port/interface. So I believe it is impossible to have collisions on a port that is configured as full duplex - other than the possible result of some bug in the code.
Is it possible that the interface counters recorded collisions at some point in the past when the port was half duplex?
I have not run into any situation where an application would not run on a port set to full duplex. And I wonder how the application would know. One of the advantages of the layered model is that the upper layers are insulated from dependencies on what happens at lower layers. How would an application know whether the port was half duplex or full duplex?
HTH
Rick

Full duplex bluetooth with Iphone?

Both my wife and I have a 3G Iphone and our Jabra BT530 headsets seem to not work as full duplex. Is this an issue with Iphone? The Jabra BT530 claims to work in full duplex mode. When I test the system and talk while the other person talks, they can't hear me; it totally cuts out they say. Tried this on two Iphones.

Well, glad to see i am not the only one.
I posted about this issue back in October, and the forum admin removed my post!
I have experimented with this issue many times, and it's always the same result.
If you use your iphone and a BT headset, and the other person is talking, you can't talk over them - because it's only half duplex.
Worse is if you use your iphone with a BT headset and call someone who is driving in their car. The noise from their car occupies the channel, and the only way they can hear you, is if you yell into the headset!
I use my phone for several hours of talktime everyday, and therefore am dependant upon a BT headset (otherwise my arm would fall off).
Because the iphone is essentially un-useable with a headset, I can not use it as a phone!!!
I was praying that Apple would fix the issue with V3.0, but SOL!
I am very surprised that more people do not complain about this. Can we be the only ones to notice the problem? Surely not!

Full Duplex with Mini

I use both my mac mini and black mac book at work. I have been unable to get the mac mini to run at full duplex. I have locked the port on the switch(Cisco3600) but when I force the mini to full duplex it does not connect at all. I have put the mac book on the same port and no problems.As I like to take the mac book with me on the road syncing my files when one system is half duplex is a real problem. Help

Hi,
It might be something specific to the 3600.
I use minis on a 6500 with full duplex set at the switch and set on the Mac and it works great.
Mark

Full Duplex issues

        Hello I am seeing a strange issue.
hope to get a little bit of advice on this.
There are two switches connected WS-C3560-48PS-S on one side and WS-C2960-24PC-S on the other side.
the interface configurations are as follows:
WS-C3560-48PS-S
interface FastEthernet0/48
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 101,350
switchport mode trunk
bandwidth 1024
load-interval 30
end
WS-C2960-24PC-S
interface FastEthernet0/24
switchport mode trunk
load-interval 30
duplex full
end
the problem is, the moment i am setting the fa 0/48 on the 3560 switch as a full duplex the interface goes down / down.
the moment i put it back to auto it comes up but the negotiation comes as half duplex and causes duplex mismatch.
Any pointers to fix this ?
many thanks in advance.

***** 3560 Sh ver *****
sh ver
Cisco IOS Software, C3560 Software (C3560-IPSERVICESK9-M), Version 12.2(53)SE2, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Wed 21-Apr-10 05:33 by prod_rel_team
Image text-base: 0x01000000, data-base: 0x02E00000
ROM: Bootstrap program is C3560 boot loader
BOOTLDR: C3560 Boot Loader (C3560-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)
Switch uptime is 10 weeks, 2 days, 23 hours, 17 minutes
System returned to ROM by power-on
System image file is "flash:c3560-ipservicesk9-mz.122-53.SE2/c3560-ipservicesk9-mz.122-53.SE2.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
[email protected].
cisco WS-C3560-48PS (PowerPC405) processor (revision N0) with 131072K bytes of memory.
Processor board ID CAT1020N055
Last reset from power-on
2 Virtual Ethernet interfaces
48 FastEthernet interfaces
4 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 00:1E:13:AA:8B:80
Motherboard assembly number     : 73-9676-12
Power supply part number        : 341-0029-05
Motherboard serial number       : CAT10256D36
Power supply serial number      : LIT11337DCM
Model revision number           : N0
Motherboard revision number     : B0
Model number                    : WS-C3560-48PS-S
System serial number            : CAT1020N055
SFP Module assembly part number : 73-7757-03
SFP Module revision Number      : A0
SFP Module serial number        : CAT10243H19
Top Assembly Part Number        : 800-25859-03
Top Assembly Revision Number    : J0
Version ID                      : V04
CLEI Code Number                : CNMV3N0CRC
Hardware Board Revision Number : 0x01
Switch Ports Model              SW Version            SW Image
*    1 52    WS-C3560-48PS      12.2(53)SE2           C3560-IPSERVICESK9-M
Configuration register is 0xF
***** 2960 Sh ver *****
Switch#sh version
Cisco IOS Software, C2960 Software (C2960-LANLITEK9-M), Version 12.2(55)SE7, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Mon 28-Jan-13 10:22 by prod_rel_team
Image text-base: 0x00003000, data-base: 0x01400000
ROM: Bootstrap program is C2960 boot loader
BOOTLDR: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(53r)SEY3, RELEASE SOFTWARE (fc1)
Switch uptime is 2 days, 19 hours, 15 minutes
System returned to ROM by power-on
System image file is "flash:/c2960-lanlitek9-mz.122-55.SE7/c2960-lanlitek9-mz.122-55.SE7.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
[email protected].
cisco WS-C2960-24PC-S (PowerPC405) processor (revision K0) with 65536K bytes of memory.
Processor board ID FCQ1719Y3Y4
Last reset from power-on
2 Virtual Ethernet interfaces
24 FastEthernet interfaces
2 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
64K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : D0:C7:89:76:19:00
Motherboard assembly number     : 73-12784-05
Power supply part number        : 341-0266-03
Motherboard serial number       : FCQ17190CKN
Power supply serial number      : DCA1713H07L
Model revision number           : K0
Motherboard revision number     : A0
Model number                    : WS-C2960-24PC-S
System serial number            : FCQ1719Y3Y4
Top Assembly Part Number        : 800-33168-02
Top Assembly Revision Number    : A0
Version ID                      : V06
CLEI Code Number                : COMK400DRD
Hardware Board Revision Number : 0x02
Switch Ports Model              SW Version            SW Image
*    1 26    WS-C2960-24PC-S    12.2(55)SE7           C2960-LANLITEK9-M
Configuration register is 0xF

Half to Full Duplex

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