Cisco Switching/Routing :: 3750 Stack Master Failure?
Apr 18, 2012
We have a stack of a 3750E with a 3750X, when we turn off the master, a disconnection occurs for around one minute while only one request timeout is seen when the slave is turned off. Is this normal? Details: in other words, when the slave switch is elected as the new master all the port-channels and some physical ports become in 'down' state before reobtaining the up state again, this results in a one minute outage. The question is: is it normal to have a layer2 control traffic interruption when the master fails and re-election occurs and if yes, what is the normal downtime in seconds. the layer2 control information such as port-channels LACP protocol are not synchronised to all slave switches by the master?
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Jan 30, 2013
I would like to know if it's possible to change a master in a 3750 stack without rebooting it?I searched in Cisco documentation, in the forum, and I googled it but I didn't find anything.
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Feb 27, 2013
I have two like switches in a stack (WS-C3750G-48PS 15.0(1)SE2 C3750-IPBASEK9-M). Switch#1 is the master and is the one that needs to be replaced. Can I force Switch #2 to be the master, then power down switch#1, remove switch#1, insert the replacement, and then power on the newly added switch without shutting down or rebooting switch#2?
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Oct 18, 2012
We have 2 3750 24 port fiber switches in a stack and we would like to change the member to become the master. Both are running the same IOS and they are alive on the network. I read that you can change the who becomes the master by setting the priority number higher on the member, which we did. However this requires a reboot of the member to take effect. Is there a way to force this without having to reboot? One other note, both switches in stack have a single gig connection that goes to the core (6500). One gig link is blocked due to spanning-tree and this is on the member that we want to become the master.
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May 14, 2008
The Catalyst 3750 switch reboots, and the " Reloading because of stack merge or communication failure" error message appears.
I saw this issue at "Cisco wiki" but the resolution in that page is just "Open a case with TAC". Because of the reasion is H/W Problem.
Is The resolution only one ? anything else? The 3750 does not use Stack.It is just stand alone. So i think it has other resolution as "disabling Stack" or another one. How about my opinion ? Is the Resolution only "Open a Case with TAC"
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Jan 22, 2013
We currently have as our stack master a 24 port Non-PoE that we want to replace with a 48 port Non-PoE. The 48 port switch at one time was provisioned as switch 3 in the stack (not the master). Correct me if I am wrong, but theoretically all I should need to do to get this working is to shut off the existing master so it re-elects a master and then provision the 48 port switch as the new switch one and make sure switch 1 has a high priority?
Do I need to write erase the switch that is replacing the current master first?
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Jun 4, 2012
I have a stack of 2960S (c2960s-universalk9-mz.122-55.SE2.bin) and the master has failed (used to have a priority of 14). The second switch has become master (priority 1) as can be seen below: [code]
If I connect a new blank 2960S (same IOS) through the stack ports, will the master sync its config to the new one without causing problems?As I understand the new blank switch will also have a priority of 1 and will by default be numbered as 1. So if the config is correctly synced and I later on want to make switch 1 the master, I need to set the priority: [code]
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Jul 18, 2012
I have 2 x 3750 stacked, the port number of the master switch is gigabitEthernet2/0/1, slave as gigabigEtherent1/0/1.
Can I change the port numbering so that the master switch gets GigabitEthernet1/0/x?
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Jan 24, 2013
IOS upgrade tried on the stack of 2XWS-C3750X-24T-S , Upgrade was tried to support WCCP on the platform. Current version is Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(58)SE1, Not able find any IP Plus ios in the site ? Only available are IP base and Universal K9 , Tried upgrading to c3750e-universalk9-tar.122-58.SE2.tar by using stack upgrade method as per document [URL]
Upgrade fails with error :
%Error opening flash:update/info (No such file or directory)
ERROR: Image is not a valid IOS image archive.
Why current ios is not supporting WCCP , I hope it is there in the featureset. ( tried "sdm prefer routing" but no success) Does c3750e-universalk9-tar.122-58.SE2.tar will give me wccp support ? What is the issue with my upgrade and how do I do a successfull upgrade ?
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Nov 5, 2011
applied an iOS update to a stack via tftp. I used the archive Download-sw tftp:// method. I rebooted the stack after complete and it never came back up. I discovered the master switch upgraded but not the member. The member was sitting there with all amber lights on and frozen after the iOS load. The master wouldn't finish boot until I removed the member from the stack. I had a version mismatch and they would not communicate.
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Dec 20, 2012
7x stack WS-C3750E-48TD-E orignal code 12.2.35...i wanted to get it to 15.0.1 so as a test i disconnected top switch (not the master ) and installed via archive download-sw /allow upgrade 15.0.1.tar. and it worked away fine...
so i moved onto the stack, issued the same command, image loaded rebooted and stack hung..Consoled in and switch was unable to boot..looping on trying to load flash. [code]
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May 29, 2013
I have a stack of 3750x switches running 15.0 (2) SE2 IOS. When I reload the switch stack, I am seeing the following message in the logs: IPv6 user port trust TCAM write failed.
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Sep 16, 2008
When installing the license for a 3750-E I get an error that the license doesn't reside on the flash though dir reveals the image in flash. Seen this, know of a resolution?
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Dec 6, 2011
I have two 3750s stacked and one 3750 standalone all in one data closet. The both have the same versions. I want to combine them to make one stack. How do I force the standalone to be the master? sw 1 priority XX(Higher then the existing stack)? Both the stack and the standalone have management addresses. Would it be ok to delete the stack ip address? That way, the standalone(master's address will be the only management address)?How should I connect the standalone 3750 to the stack? At present, the 3750 stack is connected via a cascade cable going from the stack 1 port of the top switch to the stack 2 port of the bottom switch.
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May 19, 2013
I have a stack of 4 3750 Switches.
1. WS-C3750G-12S
2. WS-C3750G-12S
3. WS-C3750X-48P
4. WS-C3750X-48P
The stack cable connected to Switch 1 Port 1 and Switch 4 Port 2 will not come back online. The logs show that there was a Stack line change. I have replaced the 1 meter Stack cable from Switch 1 to Switch 4 three times and it still does not come back online. This is the part that is interesting.. I have disconnected Port 1 Switch 4 and connected it to Port 2 Switch 4 and then Switch 4 came back online. This made me think Port 2 on Switch 4 was working correctly. Then I disconnected Port 2 Switch 1 and connected it to Port 1 Switch 1 and then Switch 1 came back online.
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Feb 20, 2013
i have two cisco 3750 in stack firts, master switch have all swports busy second have only 5 how can i see cpu utilizations of the second switch, and its reasonable to move somme devices from first switch to second for deacreases of cpu and memory utilisatio ns of the master? the stack tehnologies use both cpu as one? or its only for simple management ?
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Mar 11, 2013
have a cable i think is bad, is it possiable to switch the cable out without causing any downtime to the switch or connected devices?
HQ-1st-Flr-Stack#show switch stack-ports summary
Switch#/ Stack Neighbor Cable Link Link Sync # In
Port# Port Length OK Active OK Changes Loopback
Status To LinkOK
[Code].....
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Apr 29, 2012
I just need a little refreshing on upgrading a stack of 3750's. This stack only has 2 switches: [code]
1.) If I remember correctly I simply tftp the IOS to the flash of each switch and then reload the master only?
2.) Can I safely assume these are the 2 flash locations:
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Jun 21, 2012
i want to remove an access layer 3750 48 POE master switch and replace with a new 3750 switch in the stack. i want to copy the same configuration to new switch since the old switch is having POE issue and I got replacement of the malfunctioned switch. we have VTP domain is configured in the network...
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Mar 15, 2012
I have been given 2 3750 switches and need to put a config onto it wuld is for 2 3750's in a stack, how should I put this on the 2 switches? Is it bested to install it onto 1 switch first then physically attach the 2nd after?
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Jul 10, 2012
One of the stack member has failed and we need to replace the same with the new one.
[code],....
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Nov 21, 2011
I'm setting up a web cache using the wccp protocol on a Catalyst 3750 stack.
Probably missing something real simple here but when I from the global configuration mode are trying to enter the ip wccp command it just says "invalid input" from wccp. There is no such command.. should be supported on my device from IOS 12.2(37)
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May 19, 2012
We have two 6k5 configured as vss and it is working fine. For each floor we have a 3750 stack. In each 3750 stack we have 4 switches. From the first 3750 we have a fiber link to the first 6k5 and from the fourth switch we have another fiber link to the other 6k5 switch, for each floor/3750 stack, both configured as etherchannel. We installled each 3750 stack/floor in different maintenance windows; in all these installations we have problems configuring the etherchannel. After we configure the etherchannel on 3750 stack and in the vss, the etherchannel does not go up/up. We see the etherchannel up/down; after a lot off work, try and error, configuring shut/ no shut, adding and excluding links from the etherchannel; in any aleatory moment the etherchannel goes up/up and works fine. Is there any bug related with these IOS versions, or is there any right procedure to configure etherchannel from vss to 3750 stack?
3750 stack config (IOS
Cisco IOS Software, C3750 Software (C3750-IPBASEK9-M), Version 12.2(50)SE1, RELEASE SOFTWARE (fc2))
interface GigabitEthernet1/0/1switchport trunk encapsulation dot1qswitchport trunk allowed vlan 100,101,371,372switchport mode trunkchannel-group 1 mode on!interface GigabitEthernet4/0/1switchport trunk encapsulation dot1qswitchport trunk allowed vlan 100,101,371,372switchport mode trunkchannel-group 1 mode on!interface Port-channel1switchport trunk encapsulation dot1qswitchport trunk allowed vlan 100,101,371,372switchport mode trunk
[code]....
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Mar 5, 2012
I currently have 5 3750s connected via Stackwise. This stack is connected back to my core (6509s) via fiber (1Gig to Core1 & 1Gig to Core2). I want to move the 5th 3750 to another closet due to an addition of a new patch panel. Due to max length of 10 ft. for stackwise, my plan is to connect this 5th switch back to the stack using trunked fiber ports, with them being an etherchannel (2Gig). Also plan to use single fiber port form 2 different switches in the stack to provide some redundancy for the 5th switch. Should I be alert of any issues with this connection design? Do I need to properly remove the 5th switch from the stack using, no sw 5 provison sw-model or can I just disconnect stackwise and connect back with fiber?
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May 29, 2012
I had 2 3750 stacked and one of them decided to die (power supply) cisco replaced it and now i want to re-add that switch to stack. I have already upgraded my replacement switch to the same IOS version.I was reading that i can do it without powering down operational 3750 so the action plan so far is:
-power down NEW member
-connect stacking cable
-power up
as you can see my switch 2 is now a master and it still holds config of all Gi ports for switch 1. If i connect my NEW switch without any config (vlan.dat and startup-config) will my existing switch 2 copy all ports config to new switch ?
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Oct 22, 2012
We had an "Event" on our process network at the mill yesterday. I connected a new WS-C3560V2-48TS-S to our network and we lost communications with all of the other switches.
The core is a stack of 3 WS-C3750 switches, one is a -24TS-1U and the other two are -12S-S. These connect to 10 WS-C3560G-24TS and 5 Rockwell Stratix 8000 (IE3000) over fiber. I am planning on replaceing two 24 port switches with the new 48 port. I had the switch configured and running at my work bench. It was connected to the network with one sfp module and ran all weekend with no issues. Yesterday afternoon I took it to the network cabinet and installed it. I powered it up and connected two sfp modules to the fiber patch panel and made the connection at the core stack.
Everything looked OK. I had communication link lights working on everything. Within minutes, we lost communication with every switch connected to the core stack. I shut down the new 48 port switch and the network slowly came back up.
The new 48 port is configured with Flex Links for the fiber redundancy protocol and was connected to each of the 3750G-12S-S stack members.
I though it might have been a power issue but the stack is UPS protected and shows it has been up for over 10 weeks. I'm not even sure "Crash" is the best decription for what happened. The new switch has a high enough IP address that it would not take over as a IGMP Querier.
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Jul 17, 2012
Any one try to form a stack with mixed 3750-X and 3750G? Is there any prerequisites in hardware and software?
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Aug 2, 2012
I've a situation where I need to add a new 3750x to a existing stack of 3750. [code] When I tried to stack them together, I get a version mismatch error. Is this because of the difference in SW Image? What are my options next ? My ultimate goal is to make the new switch stack correctly with the exisitng switches.
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Nov 17, 2012
I configured 3750 A switch with vlan 20 and its IP address 192.168.20.41Its default gateway was 192.168.20.3Then i configured 3750 B switch with same default gateway and vlan 20 IP 192.168.20.43My question is now when we stack it becomes single switch and now vlan 20 ip address is 192.168.20.43 thats only IP i can see.So how does stack switch choose vlan 20 IP?Does it choose highest IP address between two switches if they have same vlan 20 as in my case?Also when i go to switch 3750 b by session command and do sh ip route it does not show ip default gateway .Also it shows vlan 20 as admin down .
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Jan 4, 2013
I am replacing our 2 3750s which are in a stack and are running in VTP server mode for the domain with 2 new 3750Gs. There are 4 trunks to other switches which bare in client mode and 2 trunks to 2 ASAs which are in active/standby mode (one in each switch). Anyway what will happen to the VTP clients when I replace the stack as the revision number will be 1 on the server? The clients will ignore any VTP updates from the server ?
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Aug 11, 2011
I have a doubt. In my environment I have two Switch 3750-X in stack.
My question is: How to shutdown remotely only a switch in stack?
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Dec 13, 2011
attached diagram and following is the basic configuration on L3 and L2 switch. Is this configuration sufficient for simple routing?
L3SWITCH:
switch 1 priority 15
switch 2 priority 10
[Code].....
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Jul 17, 2012
I am getting a version mismatch when adding the following 3750X to the 3750 stack:
WS-C3750X-48 12.2(55)SE3 C3750E-UNIVERSALK9-M
2 0 WS-C3750-24TS 12.2(25)SEA C3750-I9K91-M
Can I upgrade the 3750's to be able to correct this? Which version does this require?
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