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New Member

How to stack 2 3750 switches?

I have seen lot of documentations as how to stack 2 3750s switches.

I am looking for a step-by-step instructions on how to stack 2 3750 switches.

Really, appreciate if someone who has done it before and have hands-on experience (in lab or production environement) can direct me.

Thanks,

NG

1 ACCEPTED SOLUTION

Accepted Solutions
New Member

Re: How to stack 3750 switches?

You will not see line (with priority) when doing "sh run". But some one has done it

manually. I think, you can do it either in config mode and by setting "SWITCH_PRIORITY" environment variable.

12 REPLIES
Cisco Employee

Re: How to stack 2 3750 switches?

Hi Naveen,


Not sure if had a look at this document but take a look at this link and see if helps:

Hall of Fame Super Gold

Re: How to stack 2 3750 switches?

Read the documents posted above.  If you are still confused, here's the quick-n-dirty way:

1.  Power up the switch master (ONLY!);

2.   Attach the stacking cable to the rest of the members;

3.  Power up the members ONE-AT-A-TIME and based on the order of your choice.

Example, if switch 2 is the 2nd switch, then power this switch after the master has been powered up and stacking cable has been applied.  This is followed by switch 3, switch 4, etc.

Rules-of-the-Thumb:

1.  Ensure all switches are running the same IOS version, same Feature Set (example IP Base);

2.  Once all switches are up, ensure you enable "switch n priority XX";

New Member

Re: How to stack 2 3750 switches?

Thanks I was able to access the link.

I am not able to access the link.

Cisco Employee

Re: How to stack 2 3750 switches?

Attached the document..

JayaKrishna

New Member

Re: How to stack 2 3750 switches?

I did this scenario one month ago.

1. upgrade the new switch's IOS to match the same as the actual one (let's call it Master)

2. I shut down Master,

3. connected the new switch through its Stack cable,

4. boot Master, wait a few minutes and boot the new switch.

At this point, most of the configuration is synchronized between the two switches (vlans, etherchannel port, STP...). I had to manually configure switch ports.

Regarding stack master election and switch priority, I didn't change anything. But you should check for your gear.

Hope it helped.

New Member

Re: How to stack 3750 switches?

I am not sure if we need to boot the master?

I have these 3 switches stacked together, where SW01 is the Master.

SW01 : Stack 1 <--> Stack 2 : SW02

SW02 : Stack 1 <--> Stack 2 : SW05

SW05 : Stack 1 <--> Stack 2 : SW02

Now, I want to add SW06 to this stack

SW01 : Stack 1 <--> Stack 2 : SW02

SW02 : Stack 1 <--> Stack 2 : SW05

SW05 : Stack 1 <--> Stack 2 : SW06

SW06 : Stack 1 <--> Stack 2 : SW01

- Change the switch priority of SW06 to 1.

   switch 6 provision ws-c3750g-48ps

   switch 6 priority 1

- Make sure that you redo the connections, dis-connect and connect the stack cables

SW06 : Stack 1 <--> Stack 2 : SW01

SW06 : Stack 2 <--> Stack 1 : SW05

- Power on the newly added switch.

This I plan on doing in the production, so please let me know if I am missing any steps here or I am doing something wrong.

-NG

New Member

Re: How to stack 3750 switches?

Anyone?

New Member

Re: How to stack 3750 switches?

show switch detail
                                               Current
Switch#  Role      Mac Address     Priority     State
--------------------------------------------------------
*1       Master    0014.f2bc.6b00     15        Ready
2       Member    0019.e888.2600     10        Ready
5       Member    0016.4773.3780     1         Ready

I added switch 5 to the stack. But, when I looked at the "show switch detail"
command I see that switch 1 and 2 have priority configured on it.

But, in the config I have not configured any "switch 1 priority 15" and
"switch 2 priority 10" commands on the switch.

Where is the switch picking the priority from?
VIP Super Bronze

Re: How to stack 3750 switches?

The default priority for the switch is 1.  So, some one has changed switch-1 (master) priority to 15 and switch-2 to 10

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00807811ad.shtml#stack3

New Member

Re: How to stack 3750 switches?

You will not see line (with priority) when doing "sh run". But some one has done it

manually. I think, you can do it either in config mode and by setting "SWITCH_PRIORITY" environment variable.

New Member

Re: How to stack 3750 switches?

You can configure switch priority by issuing this command.

switch priority

A higher priority value for a stack member increases its likelihood to be elected stack master and to retain its stack member number. The priority value can be 1 to 15. The default priority value is 1.

Do "show switch detail" to find which switch you need to change the priority.

show switch detail
                                               Current
Switch#  Role      Mac Address     Priority     State
--------------------------------------------------------
*1       Master    0014.f2bc.6b00     15        Ready              
5       Member    0019.e888.2600     12        Ready              
7       Member    0016.4773.3780     10         Ready

switch 5 priority 12

switch 7 priority 10

Remember, that you will not see the switch priority command in the running config. These are written to system environment variables which you can I think grab once you are in ROMMON mode.

New Member

http://www.ccnaccnplinux.com

http://www.ccnaccnplinux.com/2015/01/switch-stack-configuration.html

if You visit i am sure you will get useful information

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