2 Cisco Stacks, need to add switches

Andy White · ‎08-28-2014

Hello,

I have 6 x 3750 switch split into 2 stacks ( A & B). This is for our VMware hosts and SANs and it works well. We have now run out of space and I have been given 2 x ws-3750G-12s-s chassis switches to add, 1 to each stack. So I have a few question on added these to the stacks, here is a diag to help:

These switches are slightly different to what we are using (in red) and we have to buy the SFP modules as the ports are empty, however will these switch be compatible?
I will need to use the same old IOS 12.2(53)?
I have highlighted in red where I think the stack cables need to go/moved does it look about right?
Will pullin gthese stack cables cause downtime?
I have to provision the stack to see the 4th switches is there any reboot required?

Thanks

Joseph W. Doherty · ‎08-28-2014

Disclaimer

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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

#1 yes (they are compatible)

#2 no, but stacks need to run same StackWise version - easiest to guarantee when all running same IOS version

#3 yes

#4 no (as long a connectivity is maintained between existing switches)

#5 no for existing switches, switch be added to stack should be connected with power off

PS:

BTW, the 12S model supports SDM templates unique to it, so insure it's running one of the "normal" SDM templates before adding to stack.

Andy White · ‎09-02-2014

Hi Joseph,

I didn't know I had a reply!

How do I know whcih StackWise versions I'm using and the DSM templates?

Thanks

Joseph W. Doherty · ‎09-02-2014

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

Examples:

sh platform stack manager all

.

Stack State Machine View
==============================================================

Switch   Master/   Mac Address          Version    Current
Number   Member                          (maj.min) State
-----------------------------------------------------------
1        Master    ####.####.####          1.45        Ready
2        Member    ####.####.####          1.45        Ready
3        Member    ####.####.####          1.45        Ready

.

sh sdm prefer

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.

number of unicast mac addresses:                  3K
number of IPv4 IGMP groups + multicast routes:    1K
number of IPv4 unicast routes:                    11K
    number of directly-connected IPv4 hosts:        3K
    number of indirect IPv4 routes:                 8K
number of IPv4 policy based routing aces:         0.5K
number of IPv4/MAC qos aces:                      0.5K
number of IPv4/MAC security aces:                 1K

Andy White · ‎09-03-2014

Hi,

What do you make of this:

Current stacks both on:

Stack A

“sh platform stack manager all”

Stack State Machine View
==============================================================

Switch Master/ Mac Address Version Current
Number Member (maj.min) State
-----------------------------------------------------------
1 Master 0023.ab09.d600 1.43 Ready
2 Member f4ac.c1c8.f900 1.43 Ready
3 Member 18ef.6333.4f00 1.43 Ready

“sh switch”

Switch/Stack Mac Address : 0023.ab09.d600
H/W Current
Switch# Role Mac Address Priority Version State
----------------------------------------------------------
*1 Master 0023.ab09.d600 5 0 Ready
2 Member f4ac.c1c8.f900 1 0 Ready
3 Member 18ef.6333.4f00 1 0 Ready

“sh sdm prefer”

The current template is "desktop default" template.

2 Additional switches:

Stack State Machine View
==============================================================

Switch Master/ Mac Address Version Current
Number Member (maj.min) State
-----------------------------------------------------------
1 Master 0019.e7d1.fa80 1.45 Ready

sh sdm pref
The current template is "aggregate default" template.

Thanks

Joseph W. Doherty · ‎09-03-2014

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

What do I make of your posted information?

I assume the -12S has a newer IOS since the stack version is newer. It also appears to be running the the default "special" -12S SDM template.

The former might or might not be a problem, but to be safe, best to install the same IOS version on all stack members. (55SE9 is very solid.)

The latter is a problem but should be fixable by changing the SDM template on the -12S (done using the SDM prefer command in config mode - do before trying to add to stack).