topic When I consoled to it and in Switching

unstacking C3850 switch issue

Per_Cas — Fri, 08 Mar 2019 13:54:31 GMT

Hello guys,

I have an issue two C3850 switches. One of C3850 is in the production and operates normally - second one I am adding to the production. Previously those switches were stacked - however I DO NOT want them to stuck. I want them to operate as two stand-alone switches.

The issue is when I connect second C3850 to the production. I does not have any configuration in it, just trunk link which is connected to router.

As soon I connect it, second switch stop working. To clean up all other background issue, I reset second switch to the factory settings. But issue still exist.

I suspect issue with stuck - second switch things that it is a active and other switch is standby.

C3850-1#sh switch
Switch/Stack Mac Address : 9c57.ad9f.4300 - Local Mac Address
Mac persistence wait time: Indefinite
                                             H/W   Current
Switch#   Role    Mac Address     Priority Version State
------------------------------------------------------------
*1       Active   9c57.ad9f.4300     1      V06     Ready

C3850-2#show switch
Switch/Stack Mac Address : 9c57.ad9f.5a00 - Local Mac Address
Mac persistence wait time: Indefinite
                                             H/W   Current
Switch#   Role    Mac Address     Priority Version State
------------------------------------------------------------
*1       Active   9c57.ad9f.5a00     1      V06     Ready

How can I fix it?

Hi

Mark Malone — Tue, 24 May 2016 07:32:01 GMT

when a standalone stack able switch is not stacked it will always show as active thats normal what you see above , when you took it out of the stack did you configure it fully as standalone as only the master probably had the config when it was stacked between the pair , so you would need to reconfigure it completely as a stand alone switch , only the ports would have configuration after removing it from stack

what configuration is currently on it and what logs alerts etc do you get when its connected to the network , are you consoled in when you do this as it will show more information of whats going wrong

When I consoled to it and

Per_Cas — Tue, 24 May 2016 09:24:39 GMT

When I consoled to it and connect that to network, it shows absolutely nothing. no logs, whatever. Same with other switch.

I configured C3850-2 switch as stand-alone switch by erase config, reset switch to its factory by holding mode bottom 7 sec and issue command:

no switch 2 provision ws-c3850-48t

No configuration sits on it except I configured 10GB link as trunk. So interfaces nr beginning now from 1/0/1 - 46(previously it was 2/0/1-46).

Also I did no change to C3850-1 switch - interfaces are listed 1/0/1 - 46 so I did not reset any config.

" you would need to reconfigure it completely as a stand alone switch "

Do you mean that switch C3850-1 I should configure as stand-alone switch as well? does it mean I should factory reset that as well?

Now it shows provision that there is only one switch:

C3850-1#show run | i provisi
switch 1 provision ws-c3850-48t

Hi

Mark Malone — Tue, 24 May 2016 09:31:58 GMT

what exactly is the issue ?

you made 2 switches standalone that's fine , switches should have separate configuration on them now there standalone , is it your trunk is not working when you connect it to the network ? can you post the configs of the switches and what your connecting between are you just trunking these switches together

you dont need to factory reset the switches for them to be standalone but when you reomve a slave switch from a stack it will only have port configuration , it wont have security,routing etc still configured

"what exactly is the issue ?"

Per_Cas — Tue, 24 May 2016 10:29:21 GMT

"what exactly is the issue ?"

issue is when I connect C3850-2 switch (which was previosly slave), C3850-1 stop to operate (mng vlan is down, it does not forward a frames any more).

" is it your trunk is not working when you connect it to the network "

Trunk is working fine, all trunk interfaces shown as connected.

"can you post the configs of the switches"

Config is complex, it contains QoS, pearser view and other not related to topic issues. Let me know what command output do you want me to paste it.

I also add that I replaced

Per_Cas — Tue, 24 May 2016 10:53:58 GMT

I also add that I replaced switch C3850-2 with C3560X - I connect it to the network with similar config(one trunk link and same vlans) - there is NO ISSUE at all.

So it is definitively something going on with C3850-2 and relation between other C3850-1 which is incredibly odd.

is spanning tree blocking the

Mark Malone — Tue, 24 May 2016 11:36:33 GMT

is spanning tree blocking the mgmt vlan when its connected ,

show spanning-tree vlan x

the vlan should only go down if there are no stp instances for it , or if there are no access ports but as its mgmt there wont be any access ports assigned to it so that only leaves stp really , if the vlan goes down there should also be logs to indicate why

check the show int trunk between the switches when its connected make sure everything is forwarding on it

hi Mark,

Per_Cas — Tue, 24 May 2016 12:13:27 GMT

hi Mark,

Span should not be an issue - if it was, I would see logs that mng vlan is blocked, anyway - as I said - I connected other switch, but different platform (C3650) with same vlan config and trunk config - and I did not see any issue with that switch.

Hi!

Carlos Villagran — Tue, 24 May 2016 13:20:13 GMT

Hi!

Do you have VTP configured in the switches?

Regards!

Hello

paul driver — Tue, 24 May 2016 15:00:01 GMT

Hello

Did you power off the switch before you disconnected it( this is an important step) and when you unprovisioned it was it from Sw1 ( the master)

When you erased the Nvram did you also delete the vlan.dat file from flash?

Can you please post the running config of the now standalone switch without it connected up to any other switch

sh vlan bri
sh vtp status
sh version

res

Paul

Hi Paul,

Per_Cas — Wed, 25 May 2016 06:53:24 GMT

Hi Paul,

I actually did not power it off. But I did that this morning. I did:

1) erase config

2) delete vlan.dat

3) reload switch

4) unplug power cable

5) configure single trunk link to router,disabled routing, vtp mode set to transparent

6) connect to the network by enabled 10GB interface

7) second switch C3850-1 which was master, intermediately stopped responding for pings

😎 there is no l2 connection beetween switches

9) no logs indicate any error on both switches

here is an output of commands you requested:

Switch#                                                      sh vlan br

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Gi1/0/1, Gi1/0/2, Gi1/0/3
                                                Gi1/0/4, Gi1/0/5, Gi1/0/6
                                                Gi1/0/7, Gi1/0/8, Gi1/0/9
                                                Gi1/0/10, Gi1/0/11, Gi1/0/12
                                                Gi1/0/13, Gi1/0/14, Gi1/0/15
                                                Gi1/0/16, Gi1/0/17, Gi1/0/18
                                                Gi1/0/19, Gi1/0/20, Gi1/0/21
                                                Gi1/0/22, Gi1/0/23, Gi1/0/24
                                                Gi1/0/25, Gi1/0/26, Gi1/0/27
                                                Gi1/0/28, Gi1/0/29, Gi1/0/30
                                                Gi1/0/31, Gi1/0/32, Gi1/0/33
                                                Gi1/0/34, Gi1/0/35, Gi1/0/36
                                                Gi1/0/37, Gi1/0/38, Gi1/0/39
                                                Gi1/0/40, Gi1/0/41, Gi1/0/42
                                                Gi1/0/43, Gi1/0/44, Gi1/0/45
                                                Gi1/0/46, Gi1/0/47, Gi1/0/48
                                                Gi1/1/1, Gi1/1/2, Te1/1/3
                                                Te1/1/4
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup

Switch#sh vtp status
VTP Version capable             : 1 to 3
VTP version running             : 1
VTP Domain Name                 :
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Disabled
Device ID                       : 9c57.ad9f.5a00
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

Feature VLAN:
--------------
VTP Operating Mode                : Transparent
Maximum VLANs supported locally   : 1005
Number of existing VLANs          : 5
Configuration Revision            : 0
MD5 digest                        : 0x57 0xCD 0x40 0x65 0x63 0x59 0x47 0xBD
                                    0x56 0x9D 0x4A 0x3E 0xA5 0x69 0x35 0xBC

Switch#sh ver
Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.07.02E RELEASE

SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Tue 21-Jul-15 12:51 by prod_rel_team

Cisco IOS-XE software, Copyright (c) 2005-2015 by cisco Systems, Inc.
All rights reserved. Certain components of Cisco IOS-XE software are
licensed under the GNU General Public License ("GPL") Version 2.0. The
software code licensed under GPL Version 2.0 is free software that comes
with ABSOLUTELY NO WARRANTY. You can redistribute and/or modify such
GPL code under the terms of GPL Version 2.0.
(http://www.gnu.org/licenses/gpl-2.0.html) For more details, see the
documentation or "License Notice" file accompanying the IOS-XE software,
or the applicable URL provided on the flyer accompanying the IOS-XE
software.

ROM: IOS-XE ROMMON
BOOTLDR: CAT3K_CAA Boot Loader (CAT3K_CAA-HBOOT-M) Version 1.18, RELEASE SOFTWARE (P)

Switch uptime is 4 minutes
Uptime for this control processor is 8 minutes
System returned to ROM by reload
System image file is "flash:packages.conf"
Last reload reason: Reload due to Express Setup

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

License Level: Ipbase
License Type: Permanent
Next reload license Level: Ipbase

cisco WS-C3850-48T (MIPS) processor with 4194304K bytes of physical memory.
Processor board ID FCW1938D16R
1 Virtual Ethernet interface
52 Gigabit Ethernet interfaces
4 Ten Gigabit Ethernet interfaces
2048K bytes of non-volatile configuration memory.
4194304K bytes of physical memory.
250456K bytes of Crash Files at crashinfo:.
1609272K bytes of Flash at flash:.
0K bytes of Dummy USB Flash at usbflash0:.
0K bytes of at webui:.

Base Ethernet MAC Address          : 9c:57:ad:9f:5a:00
Motherboard Assembly Number        : 73-16296-07
Motherboard Serial Number          : FOC19383G4J
Model Revision Number              : X0
Motherboard Revision Number        : B0
Model Number                       : WS-C3850-48T
System Serial Number               : FCW1938D16R

Switch Ports Model              SW Version        SW Image              Mode
------ ----- -----              ----------        ----------            ----
*    1 56    WS-C3850-48T       03.07.02E         cat3k_caa-universalk9 INSTALL

Configuration register is 0x102

Switch#sh run
Building configuration...

Current configuration : 3449 bytes
!
! Last configuration change at 23:43:27 UTC Tue May 24 2016
!
version 15.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
service compress-config
!
hostname Switch
!
boot-start-marker
boot-end-marker
!
!
vrf definition Mgmt-vrf
!
address-family ipv4
exit-address-family
!
address-family ipv6
exit-address-family
!
!
no aaa new-model
switch 1 provision ws-c3850-48t
!
!
!
!
!
!
!
!
qos queue-softmax-multiplier 100
vtp mode transparent
!
!
diagnostic bootup level minimal
spanning-tree mode pvst
spanning-tree extend system-id
hw-switch switch 1 logging onboard message level 3
!
redundancy
mode sso
!
!
!
class-map match-any non-client-nrt-class
!
policy-map port_child_policy
class non-client-nrt-class
bandwidth remaining ratio 10
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface GigabitEthernet0/0
vrf forwarding Mgmt-vrf
no ip address
negotiation auto
!
interface GigabitEthernet1/0/1
!
interface GigabitEthernet1/0/2
!
interface GigabitEthernet1/0/3
!
interface GigabitEthernet1/0/4
!
interface GigabitEthernet1/0/5
!
interface GigabitEthernet1/0/6
!
interface GigabitEthernet1/0/7
!
interface GigabitEthernet1/0/8
!
interface GigabitEthernet1/0/9
!
interface GigabitEthernet1/0/10
!
interface GigabitEthernet1/0/11
!
interface GigabitEthernet1/0/12
!
interface GigabitEthernet1/0/13
!
interface GigabitEthernet1/0/14
!
interface GigabitEthernet1/0/15
!
interface GigabitEthernet1/0/16
!
interface GigabitEthernet1/0/17
!
interface GigabitEthernet1/0/18
!
interface GigabitEthernet1/0/19
!
interface GigabitEthernet1/0/20
!
interface GigabitEthernet1/0/21
!
interface GigabitEthernet1/0/22
!
interface GigabitEthernet1/0/23
!
interface GigabitEthernet1/0/24
!
interface GigabitEthernet1/0/25
!
interface GigabitEthernet1/0/26
!
interface GigabitEthernet1/0/27
!
interface GigabitEthernet1/0/28
!
interface GigabitEthernet1/0/29
!
interface GigabitEthernet1/0/30
!
interface GigabitEthernet1/0/31
!
interface GigabitEthernet1/0/32
!
interface GigabitEthernet1/0/33
!
interface GigabitEthernet1/0/34
!
interface GigabitEthernet1/0/35
!
interface GigabitEthernet1/0/36
!
interface GigabitEthernet1/0/37
!
interface GigabitEthernet1/0/38
!
interface GigabitEthernet1/0/39
!
interface GigabitEthernet1/0/40
!
interface GigabitEthernet1/0/41
!
interface GigabitEthernet1/0/42
!
interface GigabitEthernet1/0/43
!
interface GigabitEthernet1/0/44
!
interface GigabitEthernet1/0/45
!
interface GigabitEthernet1/0/46
!
interface GigabitEthernet1/0/47
!
interface GigabitEthernet1/0/48
!
interface GigabitEthernet1/1/1
!
interface GigabitEthernet1/1/2
!
interface GigabitEthernet1/1/3
!
interface GigabitEthernet1/1/4
!
interface TenGigabitEthernet1/1/1
!
interface TenGigabitEthernet1/1/2
!
interface TenGigabitEthernet1/1/3
switchport mode trunk
!
interface TenGigabitEthernet1/1/4
!
interface Vlan1
no ip address
shutdown
!
ip forward-protocol nd
ip http server
ip http authentication local
ip http secure-server
!
!
!
!
!
line con 0
stopbits 1
line aux 0
line vty 5 15
!
wsma agent exec
profile httplistener
profile httpslistener
!
wsma agent config
profile httplistener
profile httpslistener
!
wsma agent filesys
profile httplistener
profile httpslistener
!
wsma agent notify
profile httplistener
profile httpslistener
!
!
wsma profile listener httplistener
transport http
!
wsma profile listener httpslistener
transport https
!
ap group default-group
end

Switch#

this is a topology(attached)

Per_Cas — Wed, 25 May 2016 07:36:46 GMT

this is a topology(attached)

Note that there is no direct L2 connection between switches. This is very odd that one switch is causing connectivity issues to another.

I replaced IOS on NEW C3850-2 for the newest one. I will see if that help.

unfortunately, IOS upgrade to

Per_Cas — Wed, 25 May 2016 09:05:23 GMT

unfortunately, IOS upgrade to the newest version did not help.Issue still exist.

unfortunately, IOS upgrade to

Per_Cas — Wed, 25 May 2016 09:06:39 GMT

unfortunately, IOS upgrade to the newest version did not help.Issue still exist.