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troubleshooting switch stack

q-le
Level 2
Level 2

                   Hi All,

In a lab environment I have stacked Master switch 3750-x series 48 ports & 3750G -24ps slave success fully.

The both have ios 12.2(55)SE6.

However we have in production a 3750x series 48 ports and I tried to stack a 3750G to it by connect it to the Master and power it on.

it keep boot up as master and does want not join the stack!!!

How do I force it to join the stack.

Any advise is much appreciated.

Thanks

QL

5 Replies 5

Ton V Engelen
Level 3
Level 3

Hi

what does the logging say? Can you post that?

Can you also post the output of:

show version

show switch

show switch stack-ports

of both the 3750-G and the 3750-X

Hi Ton,

for the 3750-X:

sh switch

Switch/Stack Mac Address : d48c.b5a3.5400

                                           H/W   Current

Switch#  Role   Mac Address     Priority Version  State

----------------------------------------------------------

*1       Master d48c.b5a3.5400     15     1       Ready

Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 54    WS-C3750X-48P      12.2(55)SE6           C3750E-UNIVERSALK9-M


Configuration register is 0xF

sh switch
Switch/Stack Mac Address : d48c.b5a3.5400
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
*1       Master d48c.b5a3.5400     15     1       Ready

sh ver

for the slave switch 3750G:

Switch#sh switch detail
Switch/Stack Mac Address : 0025.b42c.af00
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
----------------------------------------------------------
*1       Master 0025.b42c.af00     1      0       Ready

         Stack Port Status             Neighbors
Switch#  Port 1     Port 2           Port 1   Port 2
--------------------------------------------------------
  1       Down       Down             None     None

cisco WS-C3750G-24PS (PowerPC405) processor (revision H0) with 131072K bytes of memory.
Processor board ID FOC1318Z5MD
Last reset from power-on
1 Virtual Ethernet interface
28 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 00:25:B4:2C:AF:00
Motherboard assembly number     : 73-10217-08
Power supply part number        : 341-0108-04
Motherboard serial number       : FOC13191KDT
Power supply serial number      : AZS13170157
Model revision number           : H0
Motherboard revision number     : A0
Model number                    : WS-C3750G-24PS-S
System serial number            : FOC1318Z5MD
Top Assembly Part Number        : 800-26855-02
Top Assembly Revision Number    : B0
Version ID                      : V06
CLEI Code Number                : COMXD00ARA
Hardware Board Revision Number  : 0x09


Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 28    WS-C3750G-24PS     12.2(55)SE6           C3750-IPBASEK9-M


Configuration register is 0xF


Hi

looks ok to me except the G also is switch 1 but that would be resolved by stackmanager.

too bad there is no logging. is it possible (as it is a production env.) to try and add the G again and capture the logging of both switches? I m interested in what it tells us about the stacking process and what goes wrong.

You could also try to add the lab G switch to rule out any hw issue.

Hello,

Check your cabling, its possible you may have the stackwise cables wrong and this has created two separate stacks

Also prior to adding the switch to the stack:

Set the stack member and priority number - (The stack memeber defines the interface number it will use and the priority will define if its to become a stack master, the higher the number the more chance of election to stack master)

switch 1 renumber 2

switch 1 priority 1

Once connected, you can make sure that the switch stack is operating at full speed, press the mode button on a one of the switches until the Stack LED comes on, the last two led's on the switches in the stack should turn green, if this doesn't happen again you may have a cabling problem.

res

Paul


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Kind Regards
Paul

Hi Paul,

You wrote " its possible you may have stackwise cables wrong".

I connected stackwise cable from stack-port1 of master to stack-port1 of slave - that did not work so I tried

stack-port2 of slave.

what is the correct stackwise cable's configuration?

I have also set switch1 to priority 15 and switch 2 to priority 1 but they did not make any different.

One interesting thing is when switch 2 or slave boot - it looking for the master and ask for the master to be reload.

I did not want to reload the master just in case it wipe out the config of the production switch or master switch.

Thanks

Ql