Cisco Switching/Routing :: 3750 - Removing Switch From Stack Of Three

Oct 30, 2011

We have a stack of 3 cisco swithes 3750s WS-C3750G-24TS 12.2(25)SEB4 .We plan to recover a switch from the stack as it is not needed any more The switch we plan to recover is the existing Master.If we change the priority (switch 1 priority) and make another switch the master using command line will we have any loss of connectivity to the servers conecting to the stack ?

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Cisco Switching/Routing :: Removing Provisioned Switch - Cat 3750 Stack

Oct 27, 2012

We have a live stack with 4 Cat 3750 switches of mixed varieties.  Switch 1 crashed the other day and didn't come back up.  A power reset brought the switch online again, and switch 2 is now running as the stack master.  We are going to replace switch 1 in a staged approach to minimise client downtime.  Switch 1 is a ws-c3750-48ts and we will be replacing it with a ws-c3750g-48ts.  I will be pre-provisioning and installing the new switch into the stack as switch 5 and configuing the ports to be the same as switch 1.  The cables will then be moved over from switch 1 to switch 5 so the changeover time should be minimal.  When all cutover, I'll power down switch 1, reconfigure the stack cables and remove switch 1 from the stack.
My question is to what occurs next.  If I perform a 'no switch 1 provision ws-c3750-48ts' will I be left with switch 2 through to 5 (ie no switch 1)?  I can live with this moving forward.  I know I can renumber switch 5 to be switch 1 if I want, but my understanding is that I have to reload the member switch which is something I'd like to avoid at this stage.  In my reading, I saw the statement - "Note: You cannot use the switch current-stack-member-number renumber new-stack-member-number global configuration command on a provisioned switch. If you do, the command is rejected."  I'm a bit confused by this statement, I'm assuming that it is saying that if I do as above but don't issue the 'no switch 1 provision' command, I cannot renumber switch 5 to switch 1 but as long as I use the 'no switch 1 provision' command first, I can renumber switch 5 to switch 1?  Will all of my switch 5 port configuration information and any associated references (eg port-channel configuration etc) be changed from gi5/0/x to gi1/0/x if I do renumber?

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Cisco Switching/Routing :: 3750 Removing Switch From Provision

Sep 3, 2012

I have 2 x 3750's in a stack, switch 2 is the master.  We only have 5 hosts in each switch so we decided to move all hosts into switch to and removed switch 1 as we need it elsewhere.  Anyway all worked fine, but I wanted to tidy the config up as it was still provisioned so I removed the provisioning for switch 1 and the config was now showing ports 2/0/1 to 2/0/24, I then wanted to renumber switch 2 in the stack to 1 and saved the config to NVRAM and reloaded and then disaster the switch reloaded with it provisioned with 2 switches.  Switch 1 was now the main switch with no config on ports 1/0/1 to 1/0/24, but the correct config was still on 2/0/1 to 2/0/24 so I just copied those ports over switch 1's ports and then removed the second switch and all was good, but I did this all wrong, what is the best way to un-provision a switch from a stack and change the master?
The more I think about it when the switch 1 member was removed should I of copied the port config from the switch 2 (master) first and overlaid it on ports 1/0/1 to 1/0/24, renumber then master form 2 to 1 then rebooted, then removed the 2 switch from the provision?

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Cisco Switching/Routing :: 3750 / Add A New Switch In Stack?

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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Cisco Switching/Routing :: Stack Behaviour Of 3750 Switch

Nov 17, 2012

I configured 3750 A  switch with vlan 20 and its IP address default gateway was i configured 3750 B  switch with same default gateway and vlan 20 IP question is now when we stack it becomes single switch and now vlan 20 ip address is 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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Cisco Switching/Routing :: 3750-X - How To Shutdown Only Switch In Stack

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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Cisco Switching/Routing :: 3750 - Adding New Switch To Stack With Different IOS

Sep 12, 2012

We have a WS-C3750G-24PS switch running 12.2(50)SE , C3750-IPBASEK9-M in production & stand alone and we want to ask a new Cisco WS-C3750-24P running 12.2(55)SE3 , C3750-IPBASEK9-M into the stack with the 1st one.
Just want to know if it is possible and are there any problems with the IOS being different version.

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Cisco Switching/Routing :: 3750 Switch Stack-port Changes

Feb 7, 2011

I have a stack with a lot of stack-port changes, but on all the ports, how can I determine the faulty switch in the stack, cables are already verified. We did also a restart of the whole stack power off/on
running version
WS-C3750-48P       12.2(55)SE            C3750-IPBASEK9-M
This is the output after 6weeks
Switch#/  Stack   Neighbor   Cable    Link   Link   Sync      #         In  Port#     Port              Length    OK   Active   OK    Changes   Loopback          Status                                          To LinkOK          --------  ------  --------  --------  ----  ------  ----  ---------  --------  1/1     OK         4      1


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Cisco Switching/Routing :: 3750 Switch Stack Partition

Jan 6, 2013

In the current set up I have a LAN stack of 5 3750 switches configured as an access stack. As per the requirement I need to partition the current 5 switch stack into two individual stacks of 3 & 2 switches respectively. Kindly let me know the step by step process withh all the necessary commands, reloads and reconnections. I purpose to do it by changing the priority of current member switch to 15 so that its elected as Master in the new partitioned switch stack. But not sure what all steps required and in which order.

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Cisco Switching/Routing :: Switch 3750 Of Stack Rebooted With No Reason

Oct 2, 2012

One switch of our stack of 8 3750 have reboot with no reason. Nobody was in the room server when it appears et there was'nt any electrical problem at this moment.

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Cisco Switching/Routing :: 3750 - Switch Stack Reboots Every 24 Hours

Nov 12, 2011

I have four-switch Cat 3750 stack that has been working reliably for a couple years. Suddenly the other morning it reboots itself, and has been doing so every 24 hours since. take a look at the attached log? This should really be a Smartnet thing, but as it turns out the warranty we have on this is not Smartnet .

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Cisco Switching/Routing :: High Memory And CPU With 3750 Stack Switch?

Dec 26, 2012

We are having 3750 Stack switch as our edge switch. Here we are having some issues as low memory & itermediate High CPU utilization.For memory when we checked its shwoing maximum memory is allocated to DHCPD receive & ARP Input as follows
Processor Pool Total:   70829380 Used:   56809532 Free:   14019848
      I/O Pool Total:   12582912 Used:    8554920 Free:    4027992
Driver te Pool Total:    1048576 Used:         40 Free:    1048536


i want to understand why this 2 proceses (DHCPD & ARP input) taking more memory?High CPU: We also facing intermediate high CPU utilization (above 95%). When CPU is high there were 2 processes consuming more CPU are 'Spanning Tree' (about 20%) & ARP Input (about 66%). we also checked the ARP entries, there were 1500 ARP entries & 2 incomplete ARP (out of 6000 ARP supported)

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Cisco Switching/Routing :: 3750 Connect Stack Cables To New Switch

Dec 11, 2011

At a customer i've tried to add a new 3750 switch til a running stack.I used the following proccess:
1. connect stack cables to the new switch

2. bootup new switch.
Normally the new switch will become a member of the stack, but here, the switch says its the stack master. I can see that the stack port from the old switches connecting the new is up.The only way i could make it work was to provisioning the new switch as switch nr x, save, power off and then connect it and boot it up.The IOS i the same on all switches.

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Cisco Switching/Routing :: Adding A New Switch In Existing Two 3750 Stack

Mar 25, 2012

in our network we were using three 3750-48-s switches with stacking one of the switch due to some hardware failure power problem,
now i want to add a new switch 3750-48-s in the existing Stack two switches , the old two switches ios version is = 12.2(25r)SEC the new Catalyst 3750 io verion is =   12.2(35)SE5
how to add this switch in the existing two stack switches , with documentation

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Cisco Switching/Routing :: How To Configure GLBP On 3750 Stack Switch

Nov 30, 2011

I have WS-C3750-48PS-S, i wanted to implement GLBP on this switch, Is it possible to configure GLBP on this switch?
IOS :                    c3750-ipservicesk9-mz.122-55.SE4.bin
Part number:     WS-C3750-48PS-S


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Cisco Switching/Routing :: 3750 / Stack Switch With Etherchannel Configuration

Dec 20, 2012

I have stack of 2 switches 3750?I config etherchannel between them.
here is result
2      Po2(SD)         LACP      Fa1/0/15(I) Fa2/0/15(I)
Both ports are up up but standalone Int port channel 2 is down down.Need to know if this is default behaviour when we config etherchannel between stack switches?

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Cisco Switching/Routing :: Stack L3 With L2 3750 Without Upgrading L2 Switch IOS To IP Services

Nov 20, 2012

is there a document that explains the compatibility of 3750 series that can be stacked together? for example can we stack 3750-x with 3750-v2 without the power sharing? Can we stack a L3 3750 with L2 3750 without upgrading the L2 switch IOS to ip services?

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Cisco Switching/Routing :: Adding 3750 Switch To Existing Stack?

Nov 23, 2011

I am looking to add a new 3750 Switcch to an existing stack shown below
Switch   Ports Model             SW Version             SW Image
------   ----- -----             ----------             ----------
*   1   26     WS-C3750-24P       12.2(35)SE5             C3750-IPBASE-M
     2   26     WS-C3750-24P       12.2(35)SE5             C3750-IPBASE-M
     3   26     WS-C3750-24P       12.2(35)SE5             C3750-IPBASE-M

I have looked on notes to add a switch to an existing stack and haven’t identified answers on how the IOS will be affected on the new switch – will it downgrade to the current stack version or will the current stack upgrade to its version. At this moment in time I would prefer if the new switch IOS downgraded to the current stack IOS version.The new switch is a 3750V2 – will this affect how it joins the stack?The new switch has the image of IPBASEK9-M – again will this affect how it joins the stack?

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Cisco Switching/Routing :: 3750 - Can Take (4) Ports From Each Switch In Stack And LACP Together

Jun 5, 2012

I have a Cisco 3750G-48PS Running IOS 12.2(40) and was wondering how many physical ports are supported in an LACP Configuration.  Is it 4 or 8 ports in a single switch.
If I have a dual 3750 stacked together,  and I want to configure (8) port LACP, Can I take (4) ports from each switch in the stack and LACP together.

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Cisco Switching/Routing :: Proper Cabling For 2 3750-x Switch Stack

Mar 26, 2012

I have been looking at the Cisco Hardware docs and I can't find anything on the proper way to setup a 2 switch stack for Stackwise redundancy and Stackpower redundancy. Everything details 3 or more switches.

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Cisco Switching/Routing :: 3750 - Power Stack Switch Out Of Order

Jan 16, 2012

I have 4 switches in a 3750-X stack.Here is the output from the stack why are the switches out of order and I'm not able to bring up switch 1 port 1.

switch 4 port 2 shows not connect it is I've checked the cables.
Power stack name: Powerstack-4
    Stack mode: Power sharing
    Switch 1:
        Power budget: 695
        Low port priority value: 22
        High port priority value: 13
        Switch priority value: 4
        Port 1 status: Shut
        Port 2 status: Connected
        Neighbor on port 1: 0000.0000.0000
        Neighbor on port 2: c471.fe84.e100
    Switch 2:
        Power budget: 713
        Low port priority value: 21
        High port priority value: 12
        Switch priority value: 3
        Port 1 status: Connected
        Port 2 status: Connected
        Neighbor on port 1: c471.fe85.3000
        Neighbor on port 2: c471.fe80.2800
    Switch 4:
        Power budget: 697
        Low port priority value: 19
        High port priority value: 10
        Switch priority value: 1
        Port 1 status: Connected
        Port 2 status: Not connected
        Neighbor on port 1: c471.fe80.2800
        Neighbor on port 2: 0000.0000.0000
    Switch 3:
        Power budget: 710
        Low port priority value: 20
        High port priority value: 11
        Switch priority value: 2
        Port 1 status: Connected
        Port 2 status: Connected
        Neighbor on port 1: c471.fe84.e100
        Neighbor on port 2: c471.fe7f.eb00s

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Cisco Switching/Routing :: How To Change Master Switch In 3750 Stack

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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Cisco Switching/Routing :: 3750 / Reload Member Switch In Stack?

Apr 5, 2012

I have just upgraded 2 3750 switches in a stack via the master and reloaded the master switch remotely, how can I reload the 2nd (member) switch?

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Cisco Switching/Routing :: Adding Switch To Existing Stack 3750

Oct 16, 2012

I am attempting to add and Catalyst 3750 - 12 port Gigabit switch to an existing stack of 3750 48 port switches (non-X fabric). I am not sure how to proceed. These are the two questions/thoughts I have. Any additional perspective I should have before proceeding.

What kind of configuration should I apply to the Gig switch before adding it to the stack?I am sure I will need to assign priority to the new switch, ideally, it will act as master.

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Cisco Switching/Routing :: VACL Implemented To All Switch 3750 Stack

Dec 8, 2011

I have used stack wise 3750 for a long time. Now,I have a new stack of 3750. Both of them are trunking together. If I have a VACL running in the old stack, do I need also implement in the new one.

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Cisco Switching/Routing :: Possibility Of Purchasing Few 3750 To Build Switch Stack

Jan 7, 2013

I'm looking at the possibility of purchasing a few 3750 to build a switch stack to replace my current core and access switches. I'd like for the stack to support server, SAN, and user traffic, as well as provide simple switch management, redundancy, and failover. I've also been looking at the 4500, 6500, and Nexus series switches (although the Nexus switches maybe a bit too much for my network).
My current environment consists of 3560's as the core/distribution/access switches, a mixture of Hyper-V and VMWare environments (although we're slowly migrating to Hyper-V), an HP SAN (P4500), and about 100 users. Any issues going with the 3750's or have an alternative, more efficient solution?

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Cisco Switching/Routing :: Use Both Interfaces On 2921 To Connect To 3750 Stack Switch 1 And 2

Nov 9, 2012

I have a Cisco 2921 and a 3750 stack. I want to use both interfaces on the 2921 to connect to the 3750 stack switch 1 and 2. Is this possible using same ip subnet?

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Cisco Switching/Routing :: Catalyst 3750 Switch Reboots Because Of Stack Failure

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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Cisco Switching/Routing :: Boot System Configuration In 3750 Stack Switch

Dec 13, 2011

boot system switch all flash:c3750-ipservicesk9-mz.122-55.SE1/c3750-ipservicesk9-mz.122-55.SE1.bin;flash:c3750-ipservices-mz.122-25.SEE2/c3750-ipservices-mz.122-25.SEE2.bin We have two stack of 3750 switches. When I enter above command getting below mentioned error, two images are showing switch 1, but one image only showing in switch 2, i.e 1st image in show boot command.
%Command to set boot system switch all  flash:c3750-ipservicesk9-mz.122-55.SE1/c3750-ipservicesk9-mz.122-55.SE1.bin;flash:c3750-ipservices-mz.122-25.SEE2/c3750-ipservices-mz.122-25.SEE2.bin  on switch=2 failed

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Cisco Switching/Routing :: 3750 Stack - Changing Switch Member Number From 3 To 2?

Sep 24, 2012

1)  current  switch have below mentioned  switch stack details
switch#sh switchSwitch/Stack Mac Address : CurrentSwitch# Role Mac Address Priority Version State----------------------------------------------------------*1 Master 10 0 Ready3  Member 1 0 Ready
2) I am in process of changing switch member number from  3 to 2   , I executed the command on the global config mode " switch 3 renumber 2 "but I yet to reload the switch .
here I have I doubt . as currently  the ports module are   fas 1/0/1-48  and  fas 3/0/1-48 under respective vlan  . once I reload the switch is the switch port module number will get change to  fastethernt 3/0/1-48 to   fastethenet 2/0/1-48 ???  .  if it happens  the vlan configuation which configured on the fas 3/0/1-48 module  also get configured automatically  or I need to configure  manually
3) as i said  i have execuated  the command  :  "switch 3 renumber 2 " , how to remove this or revert the change  , as i checked in the running config  this command not exist .

switch ( config) # switch 3 renumber 2WARNING: Changing the switch number may result in aconfiguration change for that switch.The interface configuration associated with the old switchnumber will remain as a provisioned configuration.Do you want to continue?[confirm]Changing Switch Number 3 to Switch Number 2New Switch Number will be effective after next reboot

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Cisco Switching/Routing :: 3750 - Firmware Upgrade Of Switch Stack Fails

May 9, 2012

I have a stack of 4 Cisco Switch 3750 (1 x WS-C3750G-24T, 2 x  WS-C3750-48P and 1 x WS-C3750V2-48PS) and I want to do an firmware upgrade of this stack. Actually, all the 4 switches are at the firmware version 12.2(50) SE1 "IPBase" and I want to upgrade them to 12.2(55)SE5 IPBase. According to the release notes, all the switches in my stack are supported.
To upgrade the firmware, I use the command "archive download-sw /imageonly /overwrite tftp://IP_Address/c3750-ipbaselmk9-tar.122-55.SE5.tar" The firmware gets uploaded correctly but then I get the error message "There is insufficient space in flash: to install the required image. Clean up some old images, and try again."
When I do a "show flash", I see that the switch has 5650944 bytes free of 15998976 bytes.
How can i upgrade my switches? Is there an error in my command which I use? Do I need to add an other option?
The problem is, the switches are located in a branch office and there is no direct access to them. Everything must be done remotely.

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Cisco Switching/Routing :: WS-C3750G-24TS-S1U High CPU Utilization In 3750 Switch Stack

Jan 30, 2012

WS-C3750G-24TS-S1U switch stack with high CPU utilization. 3 switches are stacked and using PBR on that. I am attaching the show cpu process as an attachment.The current template is "desktop routing" template.The selected template optimizes the resources in the switch to support this level of features for 8 routed interfaces and 1024 VLANs. [code]

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Cisco Switching/Routing :: Configuring EtherChannel Between 3750-X Cross-stack And 6509E Switch?

Mar 3, 2013

configuring EtherChannel between 3750-X cross-stack and 6509E switch. I use two ports on 3750s, and two ports on 6509. I just need it as a trunk. For some elusive reason one port on 3750 keeps being err-disabled, and one on 6509 notconnected.
Here is what I did so far.
interface GigabitEthernet1/0/22
description ***VSS-RNOC-link***
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 2

Problem with :

GigabitEthernet1/0/22 is down, line protocol is down (err-disabled)
GigabitEthernet2/1/29 is down, line protocol is down (notconnect)
I tried shutting them down, then no shutting them again. Didn't work.

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