3750x Stacking Question

Hi,
I have a customer who is having 3750X Switch with IP Base Image.They are planning to add a new switch and these two switches will be stacked.
Could you please recommend a cost effective switch that can be stacked with existing 3750X Switch(IP Base Image).And also what all modules i need to add other than stacking cable?
Regards

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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.
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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
Do i need to order network module (C3KX-NM-1G) to stack two 3750X Switch other than stacking cable?
No. The network module, in the -X series, it to allow differ uplink ports.
What you might need to order it a stacking cable of a longer length. From Cisco, stacking cables come in three lengths. Don't know if still true, but it used to be, I believe, that a 3750 would come standard with the shortest stacking cable which is long enough to go between nearby units when physically stacked vertically together. In larger physically stacks, you would often need to order the longer cable to go between top and bottom stack units.

Similar Messages

Few questions about 3750X stack switch

Dear,
I have just joined this helpful community. Since I am still a newbie, it is my hope to comprehend through our discussions. I would like to ask few questions about 3750X stack switch:
What kind of switches are considered as provisioned switch?
What is the purpose of using provision switch?
Which advantages does a provision switch provide? If we don't use provision feature, what would be happened?
Thank you very much. Look forward to reading your replies.

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
Ivan's reference provides the details, but in real world where provisioned switches are nice include: if a switch member fails, that's switch member's configuration is still present and can be used on a like model replacement.
Also: for new stack members, being able to provision the new switch stack, before you add it to the stack, save a little time when you add the stack member to the stack. I.e. you can provision the stack member ahead of time, and then when you add the stack member, as soon as it joins the stack, it has the desired configuration.

3750x stack issue adding additional unit

I have a 3750X stack with 2 48 port members that have been up and running for over a year without issue.
I'm trying to add a new 24 port 3750X. I've made sure the priority is correct, and I've added a provision for the new member in the stack.
they are all running the exact same version of IOS.
I think the problem is, the version of the stack. the existing stack states it is version 1.45, while the new member states it is version 6.45
According to what I've read, the way to upgrade the stack version is to upgrade the IOS, but the IOS is already at the version of the new member.
I've not tried to reboot the existing stack because it's in high usage production.
here's the data I think is relevant. if anyone has a clue or needs more info, let me know.
Here's the existing stack:
The System image file is "flash:/c3750e-universalk9-mz.122-55.SE5/c3750e-universalk9-mz.122-55.SE5.bin"
BOOTLDR: C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(53r)SE2, RELEASE SOFTWARE (fc1)
                 Stack State Machine View
==============================================================
Switch   Master/   Mac Address          Version    Current
Number   Member                          (maj.min) State
1        Master    7cad.74eb.3300          1.45        Ready
2        Member    bc16.656a.5a80          1.45        Ready
Here's the new Member:
System image file is "flash:/c3750e-universalk9-mz.122-55.SE5/c3750e-universalk9-mz.122-55.SE5.bin"
BOOTLDR: C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(58r)SE1, RELEASE SOFTWARE (fc1)
                 Stack State Machine View
==============================================================
Switch   Master/   Mac Address          Version    Current
Number   Member                          (maj.min) State
3        Master    e4c7.22a1.f400          6.45        Ready

I actually need the IP Base because this stack does routing.
I think I need a license upgrade on the new switch.
I'm looking into it now.

3750x Stack is repeatedly showing error " %ADJ-3-RESOLVE_REQ : Adj resolve request: Failed to resolve IP Address vlan ID ..

Good Morning,
I have a 3750x stack running 15.0(2)SE6.
Today I started seeing some weird problems in the logs
" %ADJ-3-RESOLVE_REQ : Adj resolve request: Failed to resolve <IP Address> <vlan ID>..
To my knowledge no changes have been made except updating the NTP and Timezone settings of the switch.
The problems is that before I rebooted a vmWare - Host all communication with said host worked like a champ. After reboot of said host, the only communications that work are from the host outward. Anyone have any ideas? I would love to reboot, but as this is production hours that is not an option.

Seems that if your logged in you can't search this bug. If you google it while your logged out google will come up with a hit and you can read the bug.
The the text under conditions does not make any sense to me. Nobody wants to see a log message every time the device needs to resolve an arp entry. You shouldn't have to disable something the makes the switch perform better just to avoid filling up the log with garbage.
The message interpreter tells you
Explanation An internal software error occurred.
The details tell you to open a tac case.
Bottom line is..Will it be fixed, and in what code level will it be fixed.

Upgrading 3750X Stack IOS (suggestions)

I'm reading all sorts of problematic issues with upgrading the 3750X stack IOS on the internet. I have never performed this before and would like anyone'e suggestion on how I should do this and what I should be looking for. I will be upgrading from 12.2(53r)SE2 to 12.2.(55)SE8.

Let's say you have three 3750X in a stack. OK?
So before you even begin to push the IOS to your switch, you need to download the correct IOS for each member of your stack. Make sure each member of your switch is found in the Supported Hardware list.
Download the "universal" TAR file. Next, once you've downloaded the IOS, make sure you verify the MD5 hash value against the value found in the Cisco website. The MD5 hash value must match.
Make sure that all members of your switch stack have the same licenses and feature set.
Ok, now you've got the preparatory set, you do the actual command to push the IOS into your stack. The command is very simple. Remember, I presume that you have three switches in a stack.
The command is: archive download-sw /destination 1 /destination 2 /destination 3 tftp:///filename.tar
Using the simplified command above, this will instruct the switch to download the IOS from your TFTP server into the switch stack master's memory. The "/destination X" means it will be pushed out to each member one-at-a-time. The boot statement will also be changed so the stack will know what IOS to use.
Hope this helps.

3750x stack behavior

I installed a new 3750x stack today, 3 members. I found that one of the stack cables is too short, so I just plugged two of the 3 in and fired them up.
I expected them to form a single stack, but ended up with a stack of 2 and 1. Is this expected behavior? It's pretty much what what it would look like with a failed cable...
And no, I just powered them on and left for the day...didn't have an day time to console in.

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
I would also recommend getting the top and bottom switches connected, both for redundancy and performance. If the standard cable is too short, you can order a longer cable.

Switch ordering in a 3750x stack

Hello,
Does it matter which switch in a 3750x stack is the master (switch1)? I have two 3750x's, one a 48 port poe and another a 24 port poe. They are in a stack. Now the 48 port is on top and stacking cables connected to the 24 port on bottom. Of course the bottom switch becomes switch 1 and has interfaces Gi1/0/1 through 1/0/24.
They are both running 12.2(55)SE8 C3750E-UNIVERSALK9-M (ipbase). They are in staging now going to a new remote branch office.
I guess it really doesn't matter which switch is 1 and which is 2 does it? When we get into the new office and I break this equipment down, then I will rack the 24 port on top and the 48 port on bottom then if that makes more sense.
Or I could change it, I guess by altering this line in the config right
switch 1 provision ws-c3750x-24p
switch 2 provision ws-c3750x-48p
to
switch 1 provision ws-c3750x-48p
switch 2 provision ws-c3750x-24p
Or do you think a 24 port as the master would be better. If it has less ports to manage, maybe more CPU cycles to do master stack related things?

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
Cisco recommends the stack master not host stack uplinks. As best as I can tell, this is to try to keep some CPU processing off the stack master. So, in theory, having the master on the switch with the fewer ports might be "better" too. (Also if only one uplink, keep it off the stack master.)
As higher stack priority doesn't preempt (when a member joins a stack), you cannot guarantee which switch is the stack master unless you manually oversee the stack election. So, personally, I don't try to control it. Also, if the switch stack is forwarding in hardware, as it should, I wouldn't expect such forwarding to matter much to the switch running as master, i.e. available CPU cycles, for master needs, should be the about the same on any stack unit.

3750 stacking questions (2)

My first questin has to do with the Console port in a stack. It has been observed that the console port on the master switch is designated "Con 0". So my question is how do I access the other con ports on member switches to configure them?
The second question is what is the mechanism for statically numbering all of the switches in a stack so they are always numbered the way I configure them to be ie in case of some disaster or power outage I need to know that switch 5 will come back as switch 5 even if switches 1-4 do not come back to life.
Thanks

1. When you connect via a console cable to any of the switches in a stack you always access the stack master. The stack master is the only switch that can be used to configure the stack and its members. Assuming you have a stack of two 48 port (10/100/1000) switches; switch 1 is the master and switch 2 is a stack member. If you want to configure ports on switch2 you just use the appropriate port numbers (int gig 2/0/1 to 2/0/52). If for some reason you need console access to a stack member you can use the 'session ' command; however, do keep in mind that this access will be limited to only show and debug commands. All configuration is done via the stack master.
2. You can renumber a switch to ensure that it always retains the same number by using the 'stack renumber ' command. For example to renumber switch 2 in a stack to 3 you will use 'switch 2 renumber 3' global configuration command.
The following URL has great information on how to manage switch stacks.
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_guide_chapter09186a008050245f.html#wp1170757

3750x Stack UTIL-3-TREE: Data structure error--attempt to remove an unthreaded node from a tree

A Cisco Stack 3750X switch report the following error message:
%UTIL-3-TREE: Data structure error--attempt to remove an unthreaded node from a tree.
every minute +-20 sec
Cisco IOS Software, C3750E Software (C3750E-IPBASEK9-M), Version 15.0(2)SE4, RELEASE SOFTWARE (fc1)
analog bug: https://tools.cisco.com/bugsearch/bug/CSCsz93221

WS-C3750G-24PS-E C3750-IPBASEK9-M version 12.2(53)SE2
After implementing 802.1x with Avaya IP phones
%UTIL-3-TREE: Data structure error--attempt to remove an unthreaded node from a tree
Port then fails authentication and goes into vl-err-dis

%PLATFORM-1-CRASHED on 3750X stack

I have a stack of two 3750X's (WS-C3750X-24P-S) running c3750e-universalk9-mz.150-1.SE3.bin.
One of them (the master at the time) crashed on 27/28th Feb & appears to have kept restarting and crashing again.
Here is the syslog...
Feb 28 04:11:28.770: %PLATFORM-1-CRASHED: System previously crashed with the following message: (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.770: %PLATFORM-1-CRASHED: Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.0(1)SE3, RELEASE SOFTWARE (fc1) (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.770: %PLATFORM-1-CRASHED: Technical Support: http://www.cisco.com/techsupport (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.770: %PLATFORM-1-CRASHED: Copyright (c) 1986-2012 by Cisco Systems, Inc. (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.770: %PLATFORM-1-CRASHED: Compiled Wed 30-May-12 13:41 by prod_rel_team (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.770: %PLATFORM-1-CRASHED:   (QG-BLUECP-
Feb 28 04:11:28.770: %PLATFORM-1-CRASHED: ESR: 0x00000000 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: SRR0: 0x01B97A9C SRR1: 0x00029230 SRR2: 0x01B80DAC SRR3: 0x00029230 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: BESRA: 0x00000000, BESRB: 0x00000000, BEAR: 0x00000000 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED:   (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: CPU Register Context: (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Vector = 0x00000200 PC = 0x01B80DAC MSR = 0x00029230 CR = 0x30009005 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: LR = 0x01B80C90
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: R0 = 0x00000000 R1 = 0x06341CC8 R2 = 0x00000000 R3 = 0x00000001 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: R4 = 0x045A18E8 R5 = 0x00008002 R6 = 0x00000000 R7 = 0x0F000000 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: R8 = 0x00000000 R9 = 0x01B7AB64 R10 = 0x00000000 R11 = 0x00178298 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: R12 = 0x30000003 R13 = 0x0D98279C R14 = 0x00000000 R15 = 0x00000000 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: R16 = 0x01E8078C R17 = 0x03C00000 R18 = 0x00000000 R19 = 0x00000000 (QG-BLUECP-3750X-01-1)
Feb 28 04:11
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: R24 = 0x045A1BB0 R25 = 0x045A1DCC R26 = 0x00000350 R27 = 0x045A18E8 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: R28 = 0x00008002 R29 = 0x00000001 R30 = 0x045A18E8 R31 = 0x0ED0FAA8 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED:   (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Stack trace: (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: PC = 0x01B80DAC, SP = 0x06341CC8 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Frame 00: SP = 0x06341CE0    PC = 0x045A18E8 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Frame 01: SP =
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Frame 03: SP = 0x06341DF0    PC = 0x01E80790 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Frame 04: SP = 0x06341E10    PC = 0x01E80E5C (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Frame 05: SP = 0x06341E58    PC = 0x01E7DB4C (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Frame 06: SP = 0x06341EC0    PC = 0x022DF73C (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Frame 07: SP = 0x06341F20    PC = 0x022E00E8 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Frame 08: SP = 0x06341F40    PC = 0x022E0218 (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED: Frame 10: SP = 0x00000000    PC = 0x028478FC (QG-BLUECP-3750X-01-1)
Feb 28 04:11:28.778: %PLATFORM-1-CRASHED:   (QG-BLUECP-3750X-01-1)
Mar 3 08:38:41.986: %SYS-5-PRIV_AUTH_FAIL: Authentication to privilege level 15 failed by admin on vty0 (10.191.6.1)
The following files were created in flash...
QG-BLUECP-3750X-01-1#dir
Directory of flash:/crashinfo_ext/
475 -rwx      329296 Feb 27 2014 23:41:04 +00:00 crashinfo_ext_1
476 -rwx      260421 Feb 28 2014 03:07:18 +00:00 crashinfo_ext_2
477 -rwx      320129 Feb 28 2014 03:12:33 +00:00 crashinfo_ext_3
478 -rwx      290248 Feb 28 2014 03:16:54 +00:00 crashinfo_ext_4
479 -rwx      284496 Feb 28 2014 03:21:18 +00:00 crashinfo_ext_5
480 -rwx          65 Feb 28 2014 03:25:34 +00:00 crashinfo_ext_6
481 -rwx      276767 Feb 28 2014 03:29:52 +00:00 crashinfo_ext_7
482 -rwx      271592 Feb 28 2014 03:34:18 +00:00 crashinfo_ext_8
483 -rwx          65 Feb 28 2014 03:39:26 +00:00 crashinfo_ext_9
484 -rwx          65 Feb 28 2014 03:43:49 +00:00 crashinfo_ext_10
485 -rwx          65 Feb 28 2014 03:48:14 +00:00 crashinfo_ext_11
486 -rwx          65 Feb 28 2014 03:52:33 +00:00 crashinfo_ext_12
487 -rwx          65 Feb 28 2014 03:56:47 +00:00 crashinfo_ext_13
488 -rwx          65 Feb 28 2014 04:01:29 +00:00 crashinfo_ext_14
489 -rwx          65 Feb 28 2014 04:06:30 +00:00 crashinfo_ext_15
57671680 bytes total (13599744 bytes free)
QG-BLUECP-3750X-01-1#cd ..
QG-BLUECP-3750X-01-1#cd crashinfo
QG-BLUECP-3750X-01-1#dir
Directory of flash:/crashinfo/
491 -rwx        1761   Mar 1 1993 00:00:08 +00:00 crashinfo_1
492 -rwx        1446   Mar 1 1993 00:00:08 +00:00 crashinfo_2
493 -rwx        1761   Mar 1 1993 00:00:08 +00:00 crashinfo_3
494 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_4
495 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_5
496 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_6
497 -rwx        1761   Mar 1 1993 00:00:08 +00:00 crashinfo_7
498 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_8
499 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_9
500 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_10
501 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_11
502 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_12
503 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_13
504 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_14
505 -rwx        1671   Mar 1 1993 00:00:08 +00:00 crashinfo_15
57671680 bytes total (13599744 bytes free)
The second switch took over as the stack master as expected...
QG-BLUECP-3750X-01#sh switch
Switch/Stack Mac Address : 4403.a727.4980
                                           H/W   Current
Switch# Role   Mac Address     Priority Version State
1       Member 6c41.6a05.c780     15     1       Ready
*2       Master 4403.a727.4980     1      1       Ready
I have attached the crashdump files from flash1 that I listed above.
Is it possible for anyone to decode why the switch crashed both initially and then repeatedly when trying to come back up.
btw, It has been up for three days now since these events, but I would like to get to the root cause.
Many thanks
Steve

Hi,
It will be hard for someone on this forum to have the proper tools to the decode the crash files, that said my suggestion will be to reach out TAC for the proper assistance.
Regards,

CISCO 3750X stacking for 5 switches , only 4 switches are coming in stack

Dear All,
I have 5 cisco 3750X switches ,but only 4 switches coming up 5 switches i am unable to see .
Connection for the switch :Please find the attached snapshot for the stack data connection .
Also find the snapshot for the stack power connection .
Please provide your assistance and support to overcome this issue .

Dear Marvin,
Thanks for your reply.
is my connection provided in attachment for data stack are ok .
i login to Switch # 5 through console
following is the result :--
switch: ?
? -- Present list of available commands
arp -- Show arp table or arp-resolve an address
boot -- Load and boot an executable image
cat -- Concatenate (type) file(s)
copy -- Copy a file
delete -- Delete file(s)
dir -- List files in directories
flash_init -- Initialize flash filesystem(s)
format -- Format a filesystem
fsck -- Check filesystem consistency
help -- Present list of available commands
memory -- Present memory heap utilization information
mgmt_clr -- clear management port statistics
mgmt_init -- initialize management port
mgmt_show -- show management port statistics
mkdir -- Create dir(s)
more -- Concatenate (display) file(s)
ping -- Send ICMP ECHO_REQUEST packets to a network host
rename -- Rename a file
reset -- Reset the system
rmdir -- Delete empty dir(s)
set -- Set or display environment variables
set_bs -- Set attributes on a boot sector filesystem
set_param -- Set system parameters in flash
sleep -- Pause (sleep) for a specified number of seconds
type -- Concatenate (type) file(s)
unset -- Unset one or more environment variables
version -- Display boot loader version
switch: version
C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(58r)SE, RELEASE SOFTWARE (fc1)
Compiled Tue 26-Apr-11 06:59 by abhakat
switch: boot
Loading "flash:/c3750e-universalk9-mz.122-58.SE2/c3750e-universalk9-mz.122-58.SE2.bin"...flash:/c3750e-universalk9-mz.122-58.SE2/c3750e-universalk9-mz.122-58.SE2.bin: no such file or directory
Error loading "flash:/c3750e-universalk9-mz.122-58.SE2/c3750e-universalk9-mz.122-58.SE2.bin"
Interrupt within 5 seconds to abort boot process.
Boot process failed...
switch:
All other 4 switches i can see in stack but not these switches and also the status light for this switches is blinking green please provide your assistance .

3850 Stack Question. I'm new to stacks

So, I have two 3850's I want to put in a closet. Do I stack them or just leave them stand alones... My plan was to connect each to the core switch using fiber and users on each switch.
When I conenct the switches using the stackwise cable, I have an active and standby... Is there a way to make the standby a member? is the standby in true "standby" mode? Can I use the ports on the standby switch?
SO many questions Apppriecte any help..
Thanks

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
BTW, when you stack your pair, ideally, you still want an uplink from each switch. Depending on L2/L3 configuration, on both your stack and core device, you should be able to use the bandwidth from both links to/from the stack too. Also, if possible, try not to have the two links terminate on same line card on your core device, to avoid that also being a single point of failure.

Stack question

I use a series of <1 or 0> values in a two-dimension array, and use a boolean[][] variable to store them. But the size of each element on the stack is static, isn't it, so if I need the 1/0 values as binary strings, I might as well use an int[][] variable? I mean, it wouldn't take up any more memory or any more system resources to process? The difference actually is of little importance in my program, but I hope I'm not the only one to find the question interesting.
~H

What ever you are actually looking for, the answer is "it depends". See
http://java.sun.com/docs/books/vmspec/2nd-edition/html/Overview.doc.html#22909 and
http://java.sun.com/docs/books/vmspec/2nd-edition/html/Overview.doc.html#6654
What comes to memory usage, boolean arrays (equivalent to byte arrays) are smaller than int arrays. That means that the stack size, which may vary, can be smaller if you use boolean arrays.

Upgrading a cisco 3750x stack IOS

Hi all
can anyone tell me the quickest and easiest way to upgrade the IOS in my stack on 4 3750x switches
cheers
Carl

Hi Carl,
1. Copy the TAR IOS to your TFTP server.
2. Make sure you have access to the TFTP server (from the switch).
NOTE: There are two methods of doing this. One is via Ethernet and the other is via USB. I'll discuss USB later.
3. Jump into your stack and run this command: archive download-sw /destination 1 /dest 2 /dest 3 /dest 4 tftp:///IOS_filename.tar
If you have a USB stick:
1. Format the USB stick with FAT16;
2. Copy the IOS into the stick;
3. Insert to the Master of the 3750X USB port;
4. Command: archive download-sw /destination 1 /dest 2 /dest 3 /dest 4 usbflash0://IOS_filename.tar

SG500 stacking question

Hello we have 3 SG500 switches in my company's network, my question is can we stack them using a combination of udp and sfp cables? The problem is that the first switch is approximately 60 meters away from the others two.

Hi ,
Stacking is supported with twinax cable , not with UTP copper cable or SFP fiber cable .
Maximum Supported is 10 meter ,
Stack Connection Options
500
500X
500
5G copper – SFP-H10GB-CUxM
1G fiber or copper – MGBxxx
1G Base-T – embedded RJ45 (S1/S2)
5G copper – SFP-H10GB-CUxM
1G fiber or copper – MGBxxx
http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html
HTH
Sandy

3750x Stacking Question

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