2960 stack stopped responding

[axfalk]

Hi,

we're running a 2960 four switch stack, Version 15.2(2)E6, and yesterday it had just stopped communicating such as responding to pings, etc. Neither could we console in to see what's going on, but all the lights appeared to be green and it never lost power. When we power cycled only the master switch, it still wasn't responding, but when we power cycled all the switches, it started responding. 

Has anybody run into a similar scenario and happened to know what the root cause might be? As a corollary to that, why did it take power cycling ALL the switches for the stack to start communicating again?

Thanks.

_Greg

[ngkin2010]

Hi,

Were you pinging the switches's SVI or the management interface?

Your problem may happen if the IP address (that we were pinging) is on management interface, and also if the current stack master didn't patch (no cable connected to) the management interface.

Only the master switch's management interface will response to the incoming management traffic.

[axfalk]

Thanks for your response..

So, this stack had been up for awhile until it stopped responding yesterday, so all the cables were in place. Also, we were pinging the management address, which is on the master switch.

Thanks.

_ Greg

[paul driver]

Hello

show switch

show switch stack-ring speed
show switch stack-ports
sh version

[axfalk]

sh switch
Switch/Stack Mac Address : 701f.5324.f480
H/W Current
Switch# Role Mac Address Priority Version State
----------------------------------------------------------
*1 Master 701f.5324.f480 15 4 Ready
2 Member 50f7.22d2.3b00 13 4 Ready
3 Member 701f.5324.8b80 11 4 Ready
4 Member 701f.5324.a100 9 4 Ready

#show switch stack-ring speed

Stack Ring Speed : 20G
Stack Ring Configuration: Full
Stack Ring Protocol : FlexStack

show switch stack-ports
Switch # Port 1 Port 2
-------- ------ ------
1 Ok Ok
2 Ok Ok
3 Ok Ok
4 Ok Ok

sh ver
Cisco IOS Software, C2960X Software (C2960X-UNIVERSALK9-M), Version 15.2(2)E6, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Fri 16-Dec-16 21:27 by prod_rel_team

ROM: Bootstrap program is C2960X boot loader
BOOTLDR: C2960X Boot Loader (C2960X-HBOOT-M) Version 15.2(3r)E1, RELEASE SOFTWARE (fc1)

usdal5-sw-fl5-core-1 uptime is 19 hours, 15 minutes
System returned to ROM by power-on
System restarted at 19:20:49 UTC Mon Jan 6 2020
System image file is "flash:/c2960x-universalk9-mz.152-2.E6/c2960x-universalk9-mz.152-2.E6.bin"
Last reload reason: power-on

Thanks..

_ Greg

[Leo Laohoo]

---

@axfalk wrote:

Neither could we console in to see what's going on

---

Why not?  Was there any error message when consoled? 

---

@axfalk wrote:

this stack had been up for awhile until it stopped responding yesterday

---

How long has this stack been up?  

[lucasfreitas83]

Hello,

For troubleshooting, I think do you have two ways:

Configure Syslog server for view logs.

Try use tftpd32 for tests only, if do you don't have Syslog server

and

Use reserved memory for access console

Router(config)#memory reserved console 512

[lucasfreitas83]

Additionally, put the commands:

show controller ethernet-controller stack port 1 and 2

show platform stack compatibility

show platform stack manager all

show platform stack passive-links

show switch detail

show switch neighbors

show switch 1 | 2 | 3 and 4