Cisco Switching/Routing :: 2950 Cannot Seem To Correct A Duplex Mismatch
May 14, 2012
I cannot seem to correct a duplex mismatch issue.I have a Cisco 2950 switch connected to a Cisco 2621 router. I am running a per-interface Vlan. I have two fastethernet ports and one NM-1E card installed on the router. One fastethernet port is connected to my gateway router, the second fastethernet port is connected to my switch for one Vlan. The NM-1E Ethernet card is being used for the second Vlan which consists of nine IP cameras. Though the cameras on the Vlan are working fine.Now, the NM-1E card is set to half-duplex. I know that I should be using a fastethernet module like a 1FE 2W or a 2FE 2W card, (which I have,) but the router does not recogonize either one of these cards when they are installed, and yes, they have been confirmed as good cards.
Using Router-on-a-Stick configuration is out due to the bandwidth contention besides the fact that the router I am using it on will not handle this due to the flash being an older version.I have forced the switchport to half duplex, setting the speed to 10. I was getting fewer error messages at first, but they soon increased back to the frequency that they began with.I have set the switchport to duplex auto, but this failed to resolve the issue.Obviously, I cannot force the switchport into duplex full since the NM-1E interface is set to half duplex. Can the NM-1E card be configured to full duplex? I can't seem to find any documentation showing where it can be forced to full duplex mode.Could nine IP cameras just be too much for both the router and switch to handle?
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Jul 8, 2012
I have a 4503 switch (in L2 mode) running 12.1 hooked into a C2950 running 12.1, using regular 4 pair Cat5e cables to connect between them. The 4503 has Gigabit port 2/1 trunking to the 2950's Fa port 0/13.
When I set the duplex mode to DUPLEX FULL and SPEED to SPEED 100 on both switches (for their trunk ports) the link fails, and my 4503 loses connectivity (since it gets it from the 2950).
Here is my config from the switches (per description):
The 4503:
interface GigabitEthernet2/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,100-140
[Code].....
Note, this is the only mode that works (which seems to work fine, but I get TERRIBLE throughput for anything that goes over the 2950.
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May 25, 2012
1 week ago, I got a call from a client that reported a network outage, the client told me that, 3 switch has crashed he try to console but it just hang. I ask him, did you change something? he said he didn't change anything, he just pluged a nortelswitch to the cisco switch number 9, but that switch doesn't crash like the others (3,4,8). I check the uptime, and yes the switch never been powered off..
the topology look like this
____ 6500 ____
/ / |
1 2 3 4 5 ...... 9
the vlan is end to end vlan, so vlan span between all those switches. transparant. this is collapsed topology, core and distribution is the 6500 itself all of the 1-9 access switch are in the same rack, with no loopguard, and bpdu guard configured. and connected to the core using etherchannel. the problem is there is no log available to start the troubleshooting/investigation.
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Jan 21, 2010
I have the following issue; I am getting a duplex mismatch between a Cisco 2960 TT-L Switch running IOS 12.2(35) LAN Base Image (Gig0/1) and a Cisco 6506 Switch running IOS 12.2(33)SXH Adv IP Services (Gig2/19).
I have tried several combinations of the duplex/speed settings on both sides but the only that works is setting duplex/speed AUTO on the Cisco 2960 which ends up autonegotiating to HALF duplex and 100Mbps.
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Jun 2, 2012
Seen Duplex MisMatch errors on a N7k with a LAG going to the 5508 WLC? WLC code is 7.0.203.0. I found a BUG that is private to Cisco ( CSCth11041 ) that looks like it, but I want to make sure.
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Sep 18, 2012
In LMS I have a 6513 with several sx 1000 interface setup for etherchannel to catalyst 3750
both sides are set for autoduplex but LMS reports that there is a link duplex mismatch. We just installed the latest patches for the LMS 4.0.1
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May 16, 2013
[code] Can't find any wrong with the switch ports and AP's that can result in Duplex mismatch.The only difference I can find is the AP that is in all duplex missm. log's is used for other Mesh AP's to connect to.
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Jun 4, 2012
We have some legacy Cisco 6513 switches with the backbone (16-port GBIC blade) MTU set to 1500. It has a WS-X6148A-GE-TX blade as well, MTU set to 9K.
Now we have a customer sending MTU of 1546, their copper interface terminating on WS-6148A keeps flapping. Does the flapping have something to do with the backbone set to 1500? We cant set the backbone to 9K at this moment since it may be intrusive (reuire a reboot).
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Feb 18, 2013
I'm able to upgrade the master of a 3750 stack, but the member fails to upgrade. [code] I couldn't do rmdir flash:update unless I reload chassis... but even after reloading still cannot make the 2nd member to load with the newer IOS.
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Jun 4, 2013
I have C3750X with C3KX-NM-10G, and have-T SFP in slot 3 ( means it is not in SFP+ slot ).I need to set speed&duplex hard to 100/Full, but if I do the link goes down. I have the same settings on the other side, only IOS version is different.I tried other speeds - 10 and 1000, but no one works with Full. When I change duplex to Auto it works fine.The reason why I am doing this on C3KX-NM-10G is because I need to use NetFlow and cannot use the chassis' copper port. At the moment the ports are connected through a copper patch cord, but in full production there will be a radio link in between that requires 100M/Full to be set hard.I am trying to search for any document that would describe this limitation, but cannot find any. Also port capabilities do not indicate duplex could not be set to full:
show interfaces g1/1/3 capabilities
GigabitEthernet1/1/3
Model: WS-C3750X-48P
Type: 10/100/1000BaseTX SFP
Speed: 10,100,1000,10000,auto
Duplex: half,full,auto
Trunk encap. type: 802.1Q,ISL
[code]....
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Aug 12, 2011
3750G-12S-S.Problem description:I had a WS-3750G-12S-S in production with a defective fan tray and needed to change it.I faced to trouble with inter g1/0/1 on the new switch( it worked fine on the old).
Here the config for old switch:
interfacigabitEthernet1/0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 111-113,278,790
switchpmode trunk
speed 100
[code]....
even if I configure speed nonegotiate that does not work.
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Jun 7, 2012
I have a video feed coming into my 3570. It comes in at 5 minute input rate 18777000 bits/sec, 1695 packets/sec. However, the uplink to the router is much different, 5 minute output rate 130000 bits/sec, 28 packets/sec. I am in a lab and about ready to go into testing phase for a project when we discovered this problem, as this video feed is not veiwable on the other end.
Below is the config and capture from the switch.
BLOSSw1#sh int g1/0/6GigabitEthernet1/0/6 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is a44c.112f.3506 (bia a44c.112f.3506) MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, reliability 255/255, txload 1/255, rxload 4/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000BaseTX SFP input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:00:00, output hang never Last clearing of "show interface" counters 15:16:25 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute
[code]....
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Mar 2, 2013
I am seeing Native VLAN mismatch errors on my 6506 switches as below [code] Will it(VTP Version mismatch) be the issue for getting the VLAN Mismatch Error ?
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Feb 24, 2013
Will a MTU mismatch in Nexus 7000 affect the performance ? I have a nexus 7000 at one end with MTU set to 1500 and Melanox bx5020(Storage switch) at other end with MTU set to 9600. Storage team is complaining about performance issue related to slowness.Does MTU mismatch plays any role in slowness ??
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Dec 26, 2012
I am just wondering on how mismatched MTU sizes are handled in Layer-2 networks and also inside a particular switches internal architecture.Layer 2 devices do not do fragmentation in the even of MTU mismatch. is this because Layer 2 devices do not re-write header information (like inserting destination IP and next hop MAC into the newly created frame.) i believe this is what they call per-hop behaviour? if this not the reason, then...? assuming this is the reason, let me proceed to my next question. When we set MTU on an interface , there is no mention of direction (ingress or egress), so i take this as means in both directions. so if a jumbo frame comes in on an interface which is set to recieve jumbo frames and forwarding decision is made and the frame is scheduled to egress via an interface whose MTU is not set for Jumbo frames, will the switch drope the frame at the egress buffer? if not, this implies MTU is an ingress property(only for incoming packets). But, again if it drops the packet, then MTU shoud have been system wide or global configuration as opposed to interface level configuration (just like nexus 5000).
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Jan 27, 2013
I have a pair of 5596 running in a vPC with Nexus 2248 connected to each N5596. When I do the command "show fex" I get the following output on the 2nd 5596
Number Description State Model Serial
------------------------------------------------------------------------
101 FEX101 AA Version Mismatch N2K-C2248TP-E-1GE SSI16390705
102 FEX102 AA Version Mismatch N2K-C2248TP-E-1GE SSI163704AD
122 FEX122 Online N2K-C2232PP-10GE SSI16370195
I'm running version 5.1(3)N1(1) on both of the 5K's. I have looked through all the configuration and I am not understanding why I am getting this error. I have tried to look it up on [URL], but not having a ton of luck.
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Mar 21, 2012
I got Two Distribution Switches of Cisco 3750G. Each Distribution have two 3750G switches stacked. I also have one Cisco 3750V2 Access Switch connected to both Distribution. When I am checking for redundancy, I can only get redundancy test pass for one link not atall for other. If I have a link up with Distribution 1 only then its fine; but disappointment with Distribution 2 link. I can see that the switch priorities of Dist 2 is not correct ie. Master's priority is 10 and Member's is 15.
My question is that due to misconfigured priorities on Distribution 2 stack switches I am failing with redundancy if ONLY Dist 2 is up and Dist 1 is down.
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Jan 2, 2012
I am doing an small project, I have to connect 4 cisco switches SF 302-08 (1 GBIC each one) to a core switch SGE 2000 (4 GBICs). Because of cable length I have go connect all 5 switches with fiber. The fiber termination is multimode LC duplex. My confusion is on the mini GBICs. There is compatibilities issues i been reading. [code]
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May 3, 2012
what is causing " Gigabit port is restricted to full duplex" while trying to hard code speed/duplex on a 4507 switch port?
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Jun 11, 2013
I'm trying to stack 3750G & 3750X. As discussed in previous threads I am aware of that the version need to match.
Here the switch details:
Switch Ports Model SW Version SW Image
------ ----- -------------- ----------
* 1 24 WS-C3750G-24T 12.2(55)SE7 C3750-IPBASEK9-M
---------------------------------------------------------------------------------------------------------------
* 1 54 WS-C3750X-48 12.2(55)SE7 C3750E-IPBASEK9-M
I have changed the universal IOS on the 3750X to IP base..but they still wont come up as a stack. On the 3750X I don't see any log entry, on 3750G (major version mismatch).
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Apr 3, 2012
We have bought four identical 3750X switches with identical SW-images: 12.2(55)SE3 C3750E-UNIVERSALK9-M
We initially connected two switches, this resulted in forming a stack.With the other two switches we wanted to do the same thing. However, we received the following message:
%STACKMGR-5-MAJOR_VERSION_MISMATCH: Major Version Mismatch (Local 1 - Received 6) with neighbor-1
Both switches will not see each other and the output of show switch stack-ports shows only one switch and both stack ports as being Down.
I did some digging using the show platform stack-manager all command to find out that three of the 3750X's have the stack version number 1.45 and one has 6.45. This would obviously indicate the reason behind the mismatch, but the SW-versions on all new switches are identical!
Checking the CISCO site explains that mismatching of Major version is critical:
Major Version Number Incompatibility Among Switches
Switches with different major Cisco IOS software versions usually have different stack protocol versions. Switches with different major version numbers are incompatible and cannot exist in the same switch stack.
That's all I could find. Nothing about changing the major version number, so all I can suspect is that IOS version needs to be the same.
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Nov 15, 2012
What should the duplex mode to be set on a routed port gi0/21 that are running HSRP ? I try setting the gi0/21 to full, but it caused the port to be down. The only way for the port to be up is setting it to half duplex.
Cisco 3750 Switch
==============
interface GigabitEthernet0/21
no switchport
ip address 10.200.104.34 255.255.255.248
[Code].....
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Sep 24, 2012
We recently upgraded the switch to which an old security device was connected. It worked fine on the old switch's FastEthernet port, which was configured for speed 10 and duplex half, as that is what the device required. The new switch is a 3560X with all Gigabit ports, but the security device's port, also configured with speed 10 and duplex half, does not connect properly.As a temporary test, we daisychained another switch that has FastEthernet ports, and the security device works again.Is there anything else that needs to be added to the configuration, when using Gigabit ports at 10/half?
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Nov 2, 2011
I would like to know why i can't configure to 100 full duplex one port from target follow: WS-X6724-SFP
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Mar 31, 2013
I am trying to hard code the speed and duplex settings on interfaces gigabit 0/1 - 2 interfaces with out success.
DSW121(config)#interface range g0/1 - 02
DSW121(config-if-range)#speed ?
Nonegotiate Do not negotiate speed
[Code]...
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Jun 11, 2012
We are facing to an annoying issue. We have a 6509 running in Catos 8.3(4) with WS-X6548-GE-TX, WS-X6348-RJ-45 and WS-X6148-RJ-45. When we configure the mode in auto negotiation, it comes up in half duplex. We need to configure the speed mode at 100Mbit/Full to make it work. But if the chassis or port restarts (not the server), the link becomes half duplex. This happens only on module in Gigabyte like WS-X6548-GE-TX.
Cable have been replaced but does not work. It is not happened on another chassis running on IOS 12.2(18)SXF17b with WS-X6548-GE-TX.
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May 13, 2013
What is the correct way to lic VSS on a 4500 SUP7L-E ? url... Under Table 5 - Support by Image Type; VSS is listed as available on IP Base (SUP7E only) and a plain Yes under Enterprise Services, inferring that you need Enterprise Services lic on SUP7L-E to get VSS? url...Under Table 1 - Minimum License for VSS; IP Base or higher (7-E) or special license (7-LE and Catalyst 4500-X)Can find no option on CCO / configuration tools to list a 'special' VSS license for 4500R+E chasiss with dual SUP7L-E and IP Base.How are you meant to purchase/license VSS on 4500E Chassis + SUP7L-E ?
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Jan 20, 2013
I have two cabinets in a datacentre (with 12 CAT5 links available between them), at the moment I just have a single firewall and a very basic 3Com 2824 unmanaged gigabit switch in each cabinet that are connected together. This works perfectly as the traffic use is very light and is typically server->firewall->Internet rather than too much heavy inter-server traffic.I want to improve the redundancy and reliability however. So I plan to get two Fortigate firewalls, put them in a HA cluster and have one in each cabinet with connections to the WAN. The servers are all VMware so have mulitple NICs teamed. The last bit then is between the VMware host servers and the firewalls - the switches. I'd like to have each server connected to two switches to give multiple paths, so I'm looking at two switches per cabinet. From doing a fair bit of reading it looks like I'll have no problem with this, STP should be able to sort out the multiple routes to whichever firewall is the active member at the time. There will be some need for basic VLANing as I would like to separate management traffic and certain servers I wouldn't expect to exceed 5-10 VLANs.
As I said the traffic is very light and from what I can tell I don't require any "fancy" features, and given the I need to buy four switches I'm trying choose a switch that is reliable but will do the job and not much more. If we experience growth down the road then we can buy more expensive switches then. So I've been looking at the WS-C2960-48TT-S and the WS-C2960-48TT-L, the first using the LAN Lite software while the second uses the LAN Base. The LAN Base version is virtually twice the price so I'm wondering if there are any features of LAN Base that are required in my scenario? I've done quite a bit of reading but cannot really see a reason why LAN Lite should not work fine, but don't want to discover I missed something when it is too late .
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Jun 14, 2012
Looking at the following output (show interface status) from one of our 4507s I see gig interfaces 3/2 to 3/6 are all trunked (dot1q). When I look at a show run they do not show as trunked. They should indicate switchport trunk encapsulation dot1q and switchport mode trunk (as does interface gig4/2). I have seven other 4507s all running the same IOS: 12.2(25)EWA8 and they all show the same information in show run and show interface status (as far as trunked goes). This is not a problem as I know the interfaces are trunked and working properly I am just puzzled as to why I see this difference.
Here is the sho int gig3/2 trunk. It looks like you are correct. I did not realize some were set to trunk mode on and others were not. I would think the running config would still show the port using dot1q but I guess not.
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Apr 22, 2012
We tested a QoS in a Cisco 3750E, IOS: 12.2(58)SE2.Voice traffice in the correct Q without any problem, but all the others traffic the Defualt Q (0), tried to capture the traffic and tcp/udp port are correct.Any thing wrong with my ACL or DSCP - CoS?? ( that ACL works fin on 4500 and 6500) [code]
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Jan 1, 2012
Clarifying whats the correct # of port asic in WS-X6704-LC?According to the following link (Catalyst 6500 Architectural white paper): [URL]
"In the WS-X6704-10GE line card, there are two port ASICs each supporting 2 x 10 Gigabit Ethernet ports"
While in the document: Understanding Quality of Service on the Catalyst 6500 Switch: [URL]
Table 10.
WS-X6704
Number of 10 GE Ports 4
- QoS on 10-Gigabit Ethernet Line Cards (WS-X6704-10GE)
So whats correct? 4 port asic or 2 port asic?
# Port ASIC’s on the linecard 4
# Physical Ports per Port ASIC 1
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Sep 1, 2007
Can we force the Gigabit Ethernet port to be 1000 full duplex in Cisco Catalyst Express 500 series?
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Jan 12, 2012
The network in my building consists of several 2950s connected back to 3550s using redundant fiber links and MST. Recently one tenant decided they wanted to run their own switch and use the existing building network for VoIP only which is on a dedicated VLAN. I was thinking about creating an access port on the 2950 and setting it to the VoIP VLAN as I do not want to give them a trunk port. The client can take this link and connect to their switch. So far does not seem to be an issue. Now what happens if the client configures spanning-tree on their switch? I have no control over their device and cannot manage it. Is there a way I can protect my edge switch and access port to allow them to run their own spanning tree without it interfearing with my existing MST instances? I was thinking BPDU guard but if they turn on stp and my switch sees a bpdu then the port is disabled and they lose VoIP access. At the same time I dont want them to be able to create a loop on their switch and have it affect mine. But since the is only a single cable from my device to theirs?
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