Showing results for 
Search instead for 
Did you mean: 


Introducing the next generation of Cisco Small and Medium Business Switches. Cisco is refreshing its SMB Switch portfolio. Click here  to learn more.


SG200-26P makes randomly reboot IP phones SPA504

Dear all,

we installed a new switch SG200-26P at customer side. It is connected as uplink to an existing SF200, with which they had no issue at all. Configuration is exactly the same.

SG200-26P has the latest firmware and boot

Sadly, it happen that the attached IP Phones SPA504 are rebooting randomly. IP phones have the latest firmware 7.5.6a. In the reboot reasons I have:

Reboot History  
Reboot Reason 1:     VLAN Changed(06/24/2015 12:40:57)

Reboot Reason 2:     VLAN Changed(06/24/2015 05:28:37)  
Reboot Reason 3:     System 4(06/23/2015 12:59:48)

Reboot Reason 4:     Provisioning(01/01/2003 12:00:00)  
Reboot Reason 5:       


On the switch:

2147478598   2015-Jul-09 01:42:41 Warning   %STP-W-PORTSTATUS: gi5: STP status Forwarding, aggregated (1)        
    2147478599   2015-Jul-09 01:42:11 Informational   %LINK-I-Up:  gi5, aggregated (6)        
    2147478600   2015-Jul-09 01:42:09 Warning   %LINK-W-Down:  gi5, aggregated (6)        
    2147478601   2015-Jul-09 01:39:40 Warning   %STP-W-PORTSTATUS: gi5: STP status Forwarding        
    2147478602   2015-Jul-09 01:39:10 Informational   %LINK-I-Up:  gi5        
    2147478603   2015-Jul-09 01:39:08 Warning   %LINK-W-Down:  gi5        
    2147478604   2015-Jul-08 23:24:07 Warning   %STP-W-PORTSTATUS: gi5: STP status Forwarding, aggregated (8)        
    2147478605   2015-Jul-08 23:23:37 Informational   %LINK-I-Up:  gi5, aggregated (59)        
    2147478606   2015-Jul-08 23:23:35 Warning   %LINK-W-Down:  gi5, aggregated (59)        
    2147478607   2015-Jul-08 23:01:26 Warning   %STP-W-PORTSTATUS: gi5: STP status Forwarding        
    2147478608   2015-Jul-08 23:00:56 Informational   %LINK-I-Up:  gi5, aggregated (9)        
    2147478609   2015-Jul-08 23:00:55 Warning   %LINK-W-Down:  gi5, aggregated (9)        
    2147478610   2015-Jul-08 22:59:13 Informational   %LINK-I-Up:  gi5        
    2147478611   2015-Jul-08 22:59:11 Warning   %LINK-W-Down:  gi5        



VLAN 1 is for  Data, VLAN2 for Guest, VLAN100 for VOIP. VOIP DHCP server is located on the IPPBX UC540-BRI-K9. No issues with the IP Phones connected to the existing SF200, only on this SG200.


Do you have any clue what is happening?


Thank you!

Best regards




What does your switch config

What does your switch config look like?  Ae you using auto smartports and macros?  Those are nothing but headaches for me so I suggest to issue the global command: macro auto disabled and just configure the ports the way you like.

At least turn of auto smartports on the trunk link and hard code that.


-- please remember to rate and mark answered helpful posts --

Hi Brandon, thanks for your

Hi Brandon,


thanks for your reply. Yes, by default it is using smartports, since that configuration is working fine with the SF200 switch. I disabled the smartport  gi5, set VLAN 1U and VLAN 100T, then reboot the SPA504G. But few hours later it started again to reboot.


On the uplink itself (gi25) smartport was already disabled. 

2147478359   2015-Jul-10 09:21:51 Informational   %LINK-I-Up:  gi5, aggregated (7)        
    2147478360   2015-Jul-10 09:21:49 Warning   %LINK-W-Down:  gi5, aggregated (7)        
    2147478361   2015-Jul-10 09:17:37 Warning   %STP-W-PORTSTATUS: gi5: STP status Forwarding        
    2147478362   2015-Jul-10 09:17:33 Informational   %LINK-I-Up:  gi5, aggregated (4)        
    2147478363   2015-Jul-10 09:17:31 Warning   %LINK-W-Down:  gi5, aggregated (4)        
    2147478364   2015-Jul-10 09:17:23 Informational   %LINK-I-Up:  gi5        
    2147478365   2015-Jul-10 09:17:21 Warning   %LINK-W-Down:  gi5        
    2147478366   2015-Jul-10 08:43:51 Warning   %STP-W-PORTSTATUS: gi5: STP status Forwarding        
    2147478367   2015-Jul-10 08:43:46 Informational   %LINK-I-Up:  gi5        
    2147478368   2015-Jul-10 08:43:44 Warning   %LINK-W-Down:  gi5        
    2147478369   2015-Jul-10 08:09:07 Warning   %STP-W-PORTSTATUS: gi5: STP status Forwarding, aggregated (1)        
    2147478370   2015-Jul-10 08:09:03 Informational   %LINK-I-Up:  gi5, aggregated (1)        
    2147478371   2015-Jul-10 08:09:01 Warning   %LINK-W-Down:  gi5, aggregated (1)        
    2147478372   2015-Jul-10 08:08:55 Warning   %STP-W-PORTSTATUS: gi5: STP status Forwarding        
    2147478373   2015-Jul-10 08:08:51 Informational   %LINK-I-Up:  gi5, aggregated (6)        
    2147478374   2015-Jul-10 08:08:49 Warning   %LINK-W-Down:  gi5, aggregated (6)        
    2147478375   2015-Jul-10 08:08:30 Informational   %LINK-I-Up:  gi5        
    2147478376   2015-Jul-10 08:08:28 Warning   %LINK-W-Down:  gi5