2960X Switch Stack Master Switch all ports only link in Orange

I have 2 Cisco 2960X-48FPD-L switches running the latest version 15.0(2)EX5 software in a stack using the flex stack modules and 2 stacking cables between them.
The problem I am having is that even though I can manage the entire stack without issues the master switch for some reason will not let me link any devices of SFP's fully in. If I plug any device or fiber link in the show interface shows link and line protocol up but the ports only link in orange. I can see the connected devices via a show CDP neighbor command but cannot connect to them and if I do a show spanning-tree it says I have no spanning tree instances.
The second switch (non master) all ports link in just fine green and I can connect to it from the rest of my network via a fiber link on the SFP port. A show spanning-tree also shows the correct information for the spanning tree instance for the second switch.
Has anyone run into this and if so is there an easy solution?
Jim

Unfortunately removing the "cluster enable Switch-2960X-Cluster 0" configuration did not fix my issue. However I have found the following while troubleshooting that may be useful.
1. The problem seems to exist only on whichever switch is designated the master switch, connections to the member switch work fine.
2. If I switch the priority such that on a reboot the switches swap roles (Master to Member and vice versa) the ports that were linking in green, now link in orange and stop passing traffic and the ports that were linking in orange now link in green and start passing traffic. (Simply, the switch that is master will not link any ports in green only the switch designated as master).
3. Strangely the ports that link in orange show interface and line protocol up and I can see devices such as IP Phones and other switches with a show CDP neighbor and a show CDP neighbor detail. However they can't receive an ip address from the DHCP server and can't pass high level traffic.
4. The switch ports that are linked in only orange do not show up in the output of a "Show Spanning-Tree" command.
What do you think? This is really stumping me.

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ACL not working on 3750 Switch Stack on a trunk port

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Standard IP access list 10
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interface GigabitEthernet7/0/10
description ESX Trunk
switchport trunk encapsulation dot1q
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PACL only apply to an L2 interface. On an L2 interface the only direction that can be applied is INBOUND. On an L3 interface INBOUND or OUTBOUND can be specified.
In any case, I have worked around the issue by applying VACLs. Marking this as resolved.

2960X 15.0(2)EX5 Stack Bug? Master Switch Ports link in Orange, no spanning Tree

Is anyone aware of a bug in version 15.0(2)EX5 for 2960X Switches that would cause a switch in the master role to stop linking in new ports in green (and passing traffic). I have 2 2960X-48FPD-L Switches in a stack and whichever switch I designate master will only link new connections in orange and not pass traffic. All ports linked in show up/up and can be seen in a show cdp neighbor but won't pass any other traffic.
If I unplug the Stacking cables both switches become masters and ports linked in green on the previous member switch stay green, but after it switches to master any new connections plugged in only link in orange.
If I switch priorities and reboot the problem switches to the new master switch and the problem goes away on the member switch.
Also, a switch in the master role does not show any spanning tree instances for ports in the orange link state.
Has anyone seen this issue and do you know of a solution?
Jim

A quick update for those with this same problem.
1. 15.2(3)E turned out to be very unstable causing my switch stack to randomly lockup/reboot one of the switches about once a week.
2. I downgraded back to 15.0(2)EX5 but found a workaround. It turns out the switch stack with the 15.0 versions does not like the switchport voice vlan command on any of the interfaces on the master switch. I simply removed the voice vlan configuration on the interfaces and all the switch ports linked in just fine. I would prefer to run the phones on a voice vlan, but it still works without, just the PC's and phones are on the same vlan.
Jim

Blocked Stack Ports on 2960X-48FPD-L Stack (Unstable Switch Stack!) Spanning Tree?

I am having an issue where 2 2960X-48FPD-L Switches in a redundant flexstack (stack port 1 SW1 to port 2 SW2 and port 2 SW1 to port 1 SW2) ring.
At first running the 15.0(2).EX5 (and earlier EX3, and EX4) version IOS yielded all the ports on the stack master switch refusing to run spanning tree and would only link in amber and not pass any traffic other than CDP information (the slave switch linked in fine).
I upgraded to 15.2(3)E and this solved the problem of the ports not linking in green and participating in spanning tree.
Now, however, about every week or two I lose connectivity to the switch stack and I was able to go to the switch stack locally and found that for some reason the switch stack is blocking and unblocking VLANs on StackPort1 frequently (see below). When I was at the site, I sometimes had connectivity, sometimes not. A stack hard reboot brought everything back up, but this is the second time this has occurred and I would expect the same problem in the next week or so.
Has anyone else run into these issues, and have you found a solution?
I'm guessing that if I either get rid of the redundancy on the switch stack or stack using Ethernet cables between switches the problem will go away, but then what is the point of using stackable switches in a non redundant low speed stack. It seems to me that Spanning tree thinks that I have a spanning tree loop going on with the stack ports which I didn't even think was possible.
What do you think?
Jim
_BAD_TLV: Received SSTP BPDU with bad TLV on StackPort1 VLAN1.
Mar 11 09:02:59: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking StackPort1 on VLAN0307. Port consistency restored.
Mar 11 09:03:16: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on StackPort1 VLAN1.
Mar 11 09:03:27: %SPANTREE-2-BLOCK_PVID_PEER: Blocking StackPort1 on VLAN0307. Inconsistent peer vlan.
Mar 11 09:03:42: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking StackPort1 on VLAN0307. Port consistency restored.
Mar 11 09:03:46: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on StackPort1 VLAN1.
Mar 11 09:03:47: %SPANTREE-2-BLOCK_PVID_PEER: Blocking StackPort1 on VLAN0307. Inconsistent peer vlan.
Mar 11 09:04:12: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking StackPort1 on VLAN0307. Port consistency restored.
Mar 11 09:04:22: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on StackPort1 VLAN1.
Mar 11 09:04:56: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on StackPort1 VLAN1.
Mar 11 09:05:13: %SPANTREE-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id 207 on StackPort1 VLAN307.
Mar 11 09:05:13: %SPANTREE-2-BLOCK_PVID_LOCAL: Blocking StackPort1 on VLAN0307. Inconsistent local vlan.
Mar 11 09:05:30: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on StackPort1 VLAN1.
Mar 11 09:06:00: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on StackPort1 VLAN1.
Mar 11 09:06:04: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking StackPort1 on VLAN0307. Port consistency restored.
Mar 11 09:06:32: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on StackPort1 VLAN1.
Mar 11 09:07:02: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on StackPort1 VLAN1.
Mar 11 09:07:03: %SPANTREE-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id 207 on StackPort1 VLAN307.
Mar 11 09:07:03: %SPANTREE-2-BLOCK_PVID_LOCAL: Blocking StackPort1 on VLAN0307. Inconsistent local vlan.
Mar 11 09:07:34: %SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on StackPort1 VLAN1.
Mar 11 09:07:45: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking StackPort1 on VLAN0307. Port consistency restored.

Jim,
We have also the same problem with our 2960-X switches (access) connecting to a pair of 4500x (VSS) except our issue is with Portchannel with 2 physical links connecting the 2960xs to the 4500.
If we disconnect one of the physical links from the portchannel everything works fine, but when we connect the same physical link back all users lose connectivity and the physical link starts flapping. Here are some of the messages we see in the logs when both physical links are in the portchannel:
Mar 10 18:00:43 EST: %SPANTREE-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id 1 on Port-channel5 VLAN90.
Mar 10 18:00:43 EST: %SPANTREE-2-BLOCK_PVID_PEER: Blocking Port-channel5 on VLAN0001. Inconsistent peer vlan.
Mar 10 18:00:43 EST: %SPANTREE-2-BLOCK_PVID_LOCAL: Blocking Port-channel5 on VLAN0090. Inconsistent local vlan.
Mar 10 18:00:58 EST: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking Port-channel5 on VLAN0001. Port consistency restored.
Mar 10 18:00:58 EST: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking Port-channel5 on VLAN0090. Port consistency restored.
Mar 10 18:01:29 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/0/1, changed state to down
Mar 10 18:01:37 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/0/1, changed state to up
Mar 10 18:01:48 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/0/1, changed state to down
Mar 10 18:01:51 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/0/1, changed state to up
We have upgraded to 15.0(2a).EX5 and still have the same issue.
We have a ticket open with Cisco and have sent them all the logs and debugs and waiting to hear back from IOS developers.
HTH

Configuring Root Bridge Primary and Secondary on a Switch Stack

Hi, Consider a small LAN using a collapsed core design with two Catalyst 3650 switches in a stack as the core/distribution layer. There are several 2960X switches with cross-stack EtherChannels to the 3650's. After enabling Rapid-PVST, best practice would be to configure the root bridge. The question is, would it be sufficient to configure the stack to be the Root Primary and not configure a secondary, based on a failure of the stack master switch would elect the slave to become the stack master and effectively become the root bridge?
Thanks
Tony

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
BTW, don't know if issue also applies to 3650 stacks, but on 3750 stacks, if stack master fails, I believe your port channels will reset because, by default, stack's MAC changes. However (again at least for 3750s), the stack can be configured to retain the original master MAC.

2960x - stack cables connected while switches power on. SFP ports - status unknown

Connected 2960x uplink using SFP ports both stacks and all 4 ports worked good.
Remote tech connected last stack cable between first and last switch, in 2 different 2960x stacks of switches, while switches were powered on. A longer stack cable was needed. 3 of 4 SFP ports did stopped communicating.
One stack SFP stayed up in switch 2, not master. Completed reload - other SPF connected in switch 4/0/52
Second stack no connection on either SFP, remote tech power cycled switches.
After power cycle one SFP worked in Master 1/0/52, other switches SFP ports show "unknown" when inserting SFP.
Configured port 48 on stack with issue and connected second uplink just fine.
Has anyone experienced this with the SFP's?
- GLC-T P/N 30-1410-03
Looking for documentation on reccommending procedure for connecting stack cables while switches should be powered off or not.
Thanks,

Opened Cisco TAC case. the following bug was found.
the two different HBRN's below require 2 different IOS and they cannot be in same stack.
https://tools.cisco.com/bugsearch/bug/CSCur56395
switch#sh ver | s Hardware Board
Hardware Board Revision Number : 0x05
switch#remote command 2 sh ver | s Hardware Board
Switch : 2 :------------ Hardware Board Revision Number : 0x05
switch#remote command 3 sh ver | s Hardware Board
Switch : 3 : ------------ Hardware Board Revision Number : 0x12
switch#remote command 4 sh ver | s Hardware Board
Switch : 4 :------------Hardware Board Revision Number : 0x12
From Cisco.
Developers have recommended to upgrade the IOS version of switches with a Hardware Board revision Number below 0x10 to the release 15.0(2.0).EX5ES. this is the one attached to this email and should be applied to switch 1 and 2.
For switches with a Hardware Board revision Number above 0x10 to the release 152-2.4.E1ES, which I will send you right away. This should be done on switch 3 and 4.
Now, If you load the engineering special, you will need to do a full power-cycle (physically unplug the power and plug it back in for every single switch). A simple ‘reload’ will not resolve this.
The same must be done on Switch-0. For this stack you will only need to load the image attached to this email since all the Hardware Board revision Numbers are lower than 0x10.
done.

Replace master switch in stack

Hi Community,
I have a stack of 3750G and i want to replace the master switch priority 15 coz of faulty port .
And I receive new switch from cisco WS-C3750X-24
Switch Ports Model SW Version SW Image
* 1 30 WS-C3750X-24 12.2(55)SE4 C3750E-IPBASEK9-M
If I connect a new blank 3750X through the stack ports, will the OLD switch sync its config to the new one without causing problems? or i need to change switch only
Switch Ports Model SW Version SW Image
* 1 24 WS-C3750G-24T 12.2(55)SE4 C3750-IPBASEK9-M
2 24 WS-C3750G-24T 12.2(55)SE4 C3750-IPBASEK9-M
I change IOS of new switch to c3750e-ipbasek9-mz.122-55.SE4.bin
Please help me with this.
Awaiting your reply.

hi Leo Laohoo,
thankx for the reply,
and one more thing i want to conform that about IOS coz in my live switch having this version
Switch Ports Model SW Version SW Image
* 1 24 WS-C3750G-24T 12.2(55)SE4 C3750-IPBASEK9-M
2 24 WS-C3750G-24T 12.2(55)SE4 C3750-IPBASEK9-M
and new 3750X having
Switch Ports Model SW Version SW Image
* 1 30 WS-C3750X-24 12.2(55)SE4 C3750E-IPBASEK9-M
So this cause any issue???

How can I mirror all ports on CISCO 3750 switches to one Gigabyte port?

Hi,
I have a requirement to mirror all the ports on my 7 CISCO 3750 switches, which are in 3 separate stacks, to one single Gigabyte Ethernet port.
Does anyone know how I can do that?
Thanks in advance.

Vlad, thanks a heap for your response.
I want to apply to my sitation. Please let me know if I get them right in the following:
Catalyst A
vlan 901
remote-span
monitor session 1 source interface fastethernet 1-48 (I want to monitor all ports on the CISCO 3725)
monitor session 1 destination remote vlan 901
Catalyst B
vlan 901
remote-span (If I don't need to monitor this switch, do I still need to put anything into this switch at all?)
Catalyst C
vlan 901
remote-span
monitor session 1 source interface fastethernet 1-48 (I want to monitor all ports on this switch as well)
monitor session 1 source remote vlan 901
monitor session 1 destination interface gigabitethernet 3 (There are 4 Gigabit Ethernet Uplink in CISCO 3750, I want all the traffic to go to port 3, is this the right way to do?)
Thanks in advance.

I have just switched to samsung and i have removed the sim from the iphone however i am still receiving texts rather 'imessage' on the old iphone. how do i make sure all messages only come to my new phone??

i have just switched to samsung and i have removed the sim from the iphone however i am still receiving texts rather 'imessage' on the old iphone. how do i make sure all messages only come to my new phone??

You can turn iMessage off on your iPhone. That's relatively easy. Since iMessage is an Apple product/service, I have no idea how a Samsung phone will deal with an incoming one. For that answer you should probably contact Samsung support.

Configure all ports on a switch with one statement?

Is there a way on a 3500 series switch (IOS) to configure all the ports with 1 interface command...ie, setting ST-Portfast on ports 1-24, with something like
config t --> interf faste 0/1-24
Thanks for any replies

Yes, you can with the int range command.
SW1-3550#config t
SW1-3550(config)#int range f0/1 - 24
SW1-3550(config-if-range)#spanning-tree portfast
HTH,
Sundar

Switch stacking limitations?

Hi all, quick question.
I'm looking to stack Cisco 2960x switches in several locations. Would be doing them in stacks of 3. Is it possible to stack in this configuration?
48 port Poe
48 port Poe
24 port no Poe
Or does hardware need to be identical? They're going to be the same class switch (2960x)
When stacked we can use any port(s) on any of the 3 switches as if it was one big switch?
Thanks in advance!!! :)
Sent from Cisco Technical Support iPad App

Would be doing them in stacks of 3. Is it possible to stack in this configuration?
There is no problem with what you are planning to do.
Or does hardware need to be identical?
You can stack 2960X with 2960S. Because you can only stack up to four (4) 2960S, if you mix-stack 2960X and 2960S together, the most you can stack is four.
When stacked we can use any port(s) on any of the 3 switches as if it was one big switch?
Your understanding is correct. A stack is one big "logical" switch.

Can you stack 2960 Switch?

My question is can I stack two or more 2960 switches, master/slave design and be able to manage them both using the CMS technology or not. I don't quite understand the SFP, Small Form-Factor Pluggable, and the 2960 uplink ports. It appears as though one uplink will be in standby mode, therefore both ports can't be active at the same time. If that is the case it looks as though you can't stack becasue of only one uplink port being active.

Hi Washro,
You cannot stack 2960 switch like you can do 3750 switches but you can still achieve clustering on this switch.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2960/12240se/scg/swclus.htm
Also both uplink ports can be active at a time if they get connected to some other switches but if 2 get uplink to same switch then STP will block one port.
HTH
Ankur
*Pls rate all helpfull post

Can't write to flash1: in a 3 switch stack

I have a 3 switch stack at a remote office consisting of a 48 port 3750X, 24 port 3750X PoE, and a 48 port 3750v2. Currently this stack is functioning normally and is running 12.2(55)SE3 (universal on the X's, ipservices on the 3750v2). I want to upgrade to SE8 so that's 12.2(55)SE8 as I see in the release notes there are some vulnerabilities fixed in SSH.
For the life of me, I cannot copy the new file to flash1: which is the 24 port 3750X PoE. This switch has 20 IP phones and 2 Cisco Access points on it and is vital to the branch office. I have spare non poe switches but not spare poe switches (looking for approval), so go figure I am having the issue with the flash memory on this switch.
If I try to tftp the file c3750e-universalk9-mz.122-55.SE8.bin to flash1, I get Error opening flash1:/c3750e-universalk9-mz.122-55.SE8.bin (Bad file number).
I can get the file tftp'd to flash2 (the 48 port 3750X) fine, but if I try to copy it from flash2 to flash1, I get the same error (bad file number).
Cisco TAC reccomened format flash1: , so I tried that and get Error formatting flash1 (Device or resource busy). OK so on my own I figure maybe its corrupt, lets run fsck /test flash1: and see. NOPE can't run that either... Error fscking flash1: (Device or resource busy). Ok now lets see if any other sessions are hung where something or someone has locked flash1... so I run systat and I am the only user on the switch stack. Ok so no one else has a hung connection that may have had a write in process frozen.
So what should I do? The uptime is 30 weeks, 23 hours, 3 minutes. The last switch in the stack, the regular 3750v2 has an uptime of 15 weeks, 1 day, 20 hours, 28 minutes because it was added to the stack back then.
Anyway the network is fine and functioning... just looking to standardize all our 3750's to the 122-55.SE8 release because it is the one IOS that we've had the best luck with.

Well after a few days of SILENCE from Cisco TAC, they got back to me again and said to reseat the flash again! I said tell me how to reseat the flash when it is soldered onto the motherboard of a 3750X switch?
So they responded with this and they are going to replace the switch:
The error message( Error opening flash1:/c3750e-universalk9-mz.122-55.SE8.bin (Bad file number)) indicates that the flash is not visible,
This issue can be solved by the following steps :
Reseat the flash if you cannot,
Format the flash if you cannot,
Replace the device(hardware failure)
As I can see from this case that the device is unable to format the flash, the only way to solve the issue is to replace the switch 1,
I can tell you support has really gone downhilll. So much that I am considering Extreme Networks, Arista and Broacade for an upcoming 10gbps switching project. Another case we had with them was due to a random switch stack crash on 12.2.58SE2. Well they had the entire show tech ouput and they still reccomended to move to 15.0.2SE4. Well that was BAD advice. When you have 6 3750V2's and 3 3750X's in one stack of 9, release 15 doesn't have enough memory to even run a console. We had to break the stack and one by one go to 12.2.55SE8. I don't know what Cisco is thinking. How can they say oh run this release but then they see its a huge mixed breed stack with a large configuration and they don't take memory into consideration? I even asked are you sure, and they said yes we assure you this release will solve your problems.
So between that bad advice and this bad advice, I am really discouraged at throwing more money into "SmartNet" contracts.

2960-X stacking, 5 switches with interwoven 0.5 M cables

I am trying to understand how to connect 5 switches using 0.5 M cables only. I have read this "best practices" document, but it leaves some unanswered questions.
http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-2960-x-series-switches/white_paper_c11-728327.pdf
I would normally just daisy chain the switches and bring a connection from the bottom switch back up to the top to create a "ring" topology. But the documentation also states that switches can be connected with "interweaved cables". It makes no statement as to what if any performance considerations should be taken into account when designing stack interconnections, or whether this interwoven topology creates any operational complications. The only requirements that I have seen is that each switch must have 2 operational FlexStack links in order to be fully redundant and to fully utilize all available bandwidth. Does anyone have any guidance in this area?
Assuming no negative consequences by using the "interwoven" topology, does this make sense?
Thanks,
-Jeff

Well it probably wouldn't be confusing if I could find a clear set of ground rules. The documentation mentions "FlexStack protocol", but the discussions seem to indicate that this is a control plane protocol. Do the stacking modules operate as ethernet bridges when making forwarding decisions like any other switch port? If the answer is yes then at least I understand the principal of operation. But now if you throw multi-chassis etherchannel uplinks into the mix divining general layer 2 paths becomes a little murky.
Although now that I look at it, using this cabling has an advantage over a straight ring topology. Once a frame hits the stack it is never more than 2 hops away from it's destination. With daisy-chained switches it could be up to 4 hops. This is of course assuming standard 802.1d-like forwarding. This may be an invalid assumption. I don't see any way to get spanning tree info for the stack ports.
(EDIT: standard ring topology would also have a maximum of 2 hops to any switch, not 4)

2 Switch stack Design for redundancy

Hi Everyone,
I need to connect 2 switches in stack which will connect to 2 servers.
Each server will habe 12 NICs.
So for Redundancy purposes i can connect 6 ports from server A to Switch 1
6 Ports from server A to Switch 2
Same way i can do
6 ports from Server B to Switch 1
6 ports from Server B to switch 2
IF i go with above design and in case say switch 2 dies then stack will have single switch will it cause any outage?
Regards
Mahesh

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 i go with above design and in case say switch 2 dies then stack will have single switch will it cause any outage?
It depends.
One of your two switches will run in the role of switch master, and if that switch fails, there's a brief impact as control plane function are taken over by the second switch. Whether this control plane switch over causes any impact to the server hosts depends on switch configuration and how (via L2 or L3) the hosts are communicating to other hosts. For example, if you're running default, regarding master switch MAC persistence, that MAC will change, which I understand, will drop Etherchannel.

2960X Switch Stack Master Switch all ports only link in Orange

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