Stacking 3750s

[GRANT3779]

I have a 3750 to install, with a view to adding another at a later date and run them as a stack. Is there anything "special" I need to do to prep the one being installed just now? Never dealth with building stacks before. I have the stacking cables, but just want to know if there is any pre planning required. The 2nd switch I will be installing at a later date I would like to be the master within the stack.

[InayathUlla Sharieff]

Hi Grant,

Hi,

Please find below link which explain how to stack the 3750 switches:

1- As of now you need to have to worry about configuring anything in respective of Stacking.

2- Once you planned to stack after getting the second switch kindly go through the link below which explains you step by step procedure of stacking the switches;

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

Easy way:

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

2.   Attach the stacking cable between Switch 1 and Switch 2. (Switch 1 will be Master and Switch 2 is your Member Switch).

3. After attaching the stacking cable now power up the Switch 2.

4- If you want this switch to be the master then you need to configure higher priority value on this.

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.

NOTE:  Ensure both the switches are running the same IOS version, same Feature Set (example IP Base);

HTH

Regards

Inayath

*********Please rate useful posts and remember to mark any solved questions as answered. Thank you.*********

[GRANT3779]

Great thanks a lot for that.

If the switches are both running say universal IOS 15 - do they need to have the same features enabled/licensed? How can I check they have the same?

Thanks again

[Bilal Nawaz]

Hello, generally speaking - if we was to add a switch to a stack, we dont really have to do anything, just plug the stack cables in. However if you want to pre plan there are some really neat things that can be done to save time. The IOS image needs to be the same on both switches.

If you want to provision a new switch, but you havent yet installed it you can do this:

Bilal-3750TEST(config)# switch 2 provision ?

  nme-xd-24es-1s         provision an EtherSwitch SM with 24+1G interfaces

  nme-xd-24es-1s-p       provision an EtherSwitch SM with 24+1G interfaces

  rulai                  RULAI test board

  ws-c3750-24fs          provision a Catalyst 3750 switch with 24FX+2G interfaces

  ws-c3750-24p           provision a Catalyst 3750 switch with 24pwr+2G interfaces

  ws-c3750-24ts          provision a Catalyst 3750 switch with 24+2G interfaces

  ws-c3750-48p           provision a Catalyst 3750 switch with 48pwr+4G interfaces

  ws-c3750-48ts          provision a Catalyst 3750 switch with 48+4G interfaces

  ws-c3750e-24pd         provision a Catalyst 3750E switch with 24GPwr+2TenG interfaces

  ws-c3750e-24td         provision a Catalyst 3750E switch with 24G+2TenG interfaces

  ws-c3750e-48pd         provision a Catalyst 3750E switch with 48GPwr+2TenG interfaces

  ws-c3750e-48td         provision a Catalyst 3750E switch with 48G+2TenG interfaces

  ws-c3750g-12s          provision a Catalyst 3750 switch with 12G interfaces

  ws-c3750g-12s-d        provision a Catalyst 3750 switch with 12G interfaces and DC power supply

  ws-c3750g-16td         provision a Catalyst 3750 switch with 16G+1XENPAK interfaces

  ws-c3750g-24ps         provision a Catalyst 3750 switch with 24Gpwr+4G interfaces

  ws-c3750g-24t          provision a Catalyst 3750 switch with 24GTX interfaces

  ws-c3750g-24ts         provision a Catalyst 3750 switch with 24GTX+4G interfaces

  ws-c3750g-24ts-1u      provision a Catalyst 3750 switch with 24GTX+4G interfaces

  ws-c3750g-24ws-s25/50  provision a Catalyst 3750 switch with 24Gpwr+2G interfaces + Wireless Controller

  ws-c3750g-48ps         provision a Catalyst 3750 switch with 48Gpwr +4G interfaces

  ws-c3750g-48ts         provision a Catalyst 3750 switch with 48GTX+4G interfaces

  ws-c3750v2-24fs        provision a Catalyst 3750V2 switch with 24FX+2G interfaces

  ws-c3750v2-24ps        provision a Catalyst 3750V2 switch with 24pwr+2G interfaces

  ws-c3750v2-24ts        provision a Catalyst 3750V2 switch with 24+2G interfaces

  ws-c3750v2-48ps        provision a Catalyst 3750V2 switch with 48pwr+4G interfaces

  ws-c3750v2-48ts        provision a Catalyst 3750V2 switch with 48+4G interfaces

  ws-c3750x-12s          provision a Catalyst 3750X switch with 12G+2TenG interfaces

  ws-c3750x-12s          provision a Catalyst 3750X switch with 12G+2TenG interfaces

  ws-c3750x-24           provision a Catalyst 3750X switch with 24G+2TenG interfaces

  ws-c3750x-24p          provision a Catalyst 3750X switch with 24GPwr+2TenG interfaces

  ws-c3750x-24s          provision a Catalyst 3750X switch with 24G+2TenG interfaces

  ws-c3750x-24s          provision a Catalyst 3750X switch with 24G+2TenG interfaces

  ws-c3750x-48           provision a Catalyst 3750X switch with 48G+2TenG interfaces

  ws-c3750x-48p          provision a Catalyst 3750X switch with 48GPwr+2TenG interfaces

This will allow you to provision an additional switch. (Once you have done this, you can start configuring the ports without having to plug the switch in to the stack yet)

If you want to take control on which switch is the master, you need to adjust the priority. The highest value wins.

Bilal-3750TEST(config)# switch 1 priority 15

Changing the Switch Priority of Switch Number 1 to 15

Do you want to continue?[confirm]

New Priority has been set successfully

This is all I can think of for now. Apart from that its really simple and can be done when the switches are 'on'/running.

Hope this helps

Please rate useful posts and remember to mark any solved questions as answered. Thank you.

[GRANT3779]

Thanks for that Bilal,

So this switch 2 provision command - I do this on my current switch and it will make the 2nd switch ports visible to me for configuring (even though switch 2 isn't yet plugged in)?

[Bilal Nawaz]

Yes, correct :-) just ensure the model is correct, that caught me out once!

Please rate useful posts and remember to mark any solved questions as answered. Thank you.

[GRANT3779]

Also, If I start stackig more than 2, say 4 / 5 switches, is there a certain way the stack cables need to be attached for redundancy? also the Power cables?

[Bilal Nawaz]

It would be a bit like this:

Reference:

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

What about the power cables? Do you mean stackpower?

If so, it would be very similar:

But I think this is for the 'X' series switches.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps6406/white_paper_c11-578931.html

Hope this helps

Please rate useful posts and remember to mark any solved questions as answered. Thank you.

[paul driver]

Hello

a couple.of.things you can.do

1) upgrade the ios to the.same version as the live 3750

2).provison the existing switch

think the command is " switch 2 name provison"

3) set the existing live switch higher priorty ( command escapes me at present)

4) attach the switch whilst running this then should obtain the.existing live switches config

res
paul


Sent from Cisco Technical Support Android App

[GRANT3779]

great help here thanks.

You mentioned point 4 below.

4) attach the switch whilst running this then should obtain the.existing live switches config

What sort of config will it pull down? Does it duplicate the config, e.g all my layer 3 interfaces / vlans etc,,? If one switch fails, does the other just take over all duties?

[Bilal Nawaz]

Hello - yes the config and vlan database remains the same on all switches, in sync.

If you do a show flash on each switch, all config files and vlan.dat files are the same. You can verify by doing a tftp to your pc/laptop to check config.text

Bilal-3750TEST#show flash1

Directory of flash:/

    2  -rwx    16074189   Mar 1 1993 00:10:10 +00:00  c3750-ipbasek9-mz.150-1.SE3.bin

    4  -rwx        1156   Mar 1 1993 00:03:31 +00:00  vlan.dat

    5  -rwx       12014   Mar 1 1993 00:04:16 +00:00  config.text.backup

    6  -rwx          24   Mar 1 1993 00:04:17 +00:00  private-config.text.backup

    7  -rwx        1968   May 3 2013 17:24:49 +01:00  private-config.text

    9  -rwx      249484   May 3 2013 17:24:46 +01:00  config.text

    8  -rwx        3096   May 3 2013 17:24:49 +01:00  multiple-fs

27998208 bytes total (11517952 bytes free)

Bilal-3750TEST#show flash2

Directory of flash2:/

    2  -rwx    16074189   Mar 1 1993 00:17:40 +00:00  c3750-ipbasek9-mz.150-1.SE3.bin

    3  -rwx      249484   May 3 2013 17:25:07 +01:00  config.text

    4  -rwx        1156   Mar 1 1993 00:04:00 +00:00  vlan.dat

    5  -rwx      249401   May 3 2013 17:11:48 +01:00  config.text.backup

    6  -rwx        1968   May 3 2013 17:11:51 +01:00  private-config.text.backup

    7  -rwx        1968   May 3 2013 17:25:10 +01:00  private-config.text

    9  -rwx        3096   Mar 1 1993 00:04:11 +00:00  multiple-fs

Remember, when the master fails if it did not save the config to the other switches, the whole stack would lose its configuration and fail your network. So stackwise etc... is a really good technology in this aspect.

Hope this helps

Please rate useful posts and remember to mark any solved questions as answered. Thank you.

[paul driver]

Hello

yes there is a certain way - check cco 3750 stackwise for the correct stackwise cabling as if you it incorrectly you could end up not getting he optimal backplane speed

but i am sure someone from csc eill supply you the url

res
paul

res


Sent from Cisco Technical Support Android App