某局点S6800 STP显示异常

现场有多台S6800，现在发现有组堆叠的6800存在stp显示异常。从手册里的回显来看，如果生成树未配置的情况下，查看display stp brief看的话也会是如下回显：

# 当生成树协议未开启时，在MSTP模式下显示生成树的状态和统计信息。

<Sysname> display stp

 Protocol status    : Disabled

 Protocol Std.      : IEEE 802.1s

 Version            : 3

 Bridge-Prio.       : 32768

 MAC address        : 000f-e200-8048

 Max age(s)         : 20

 Forward delay(s)   : 15

 Hello time(s)      : 2

 Max hops           : 20

 TC Snooping        : Disabled

异常设备回显如下：

  ===============display stp brief=============== 

STP is not configured.

  ===============display stp=============== 

STP is not configured.

（1）通过Display process 没有stpd进程。

[H3C]dis process | in stp                                                                                                          

       531        531  0.0  0.0   S  120   N     ttyS0 00:00:00 grep -E stp       

（2）进一步测试发现不同版本下设备处理机制不同，在设备未开启stp功能时，R2702设备启动时默认会启动stpd进程，而F2707之后的版本则不会启动：

R2702版本默认会启动stp进程

[H3C]dis cu | in stp                                                                                                               

[H3C]                                                                                                                               

[H3C]                                                                                                                              

[H3C]dis process | in stp                                                                                                           

       339        339  0.0  0.0   S  110   N        -  00:00:01 stpd                                                               

       510        510  0.0  0.0   S  120   N     ttyS0 00:00:00 grep -E stp                                                         

[H3C]dis stp                                                                                                                       

 Protocol status    : Disabled                                                                                                      

 Protocol Std.      : IEEE 802.1s                                                                                                  

 Version            : 3                                                                                                             

 Bridge-Prio.       : 32768                                                                                                        

 MAC address        : 50da-00eb-45ba                                                                                                

 Max age(s)         : 20                                                                                                           

 Forward delay(s)   : 15                                                                                                            

 Hello time(s)      : 2                                                                                                            

 Max hops           : 20                                                                                                            

 TC Snooping        : Disabled                                                                                                     

[H3C]                                

F2707及之后版本默认不会启动stp进程，使能stp进程才会起来，现场是F2707版本，现象是正常的

[H3C]dis cu | in stp                                                                                                               

[H3C]                                                                                                                               

[H3C]                                                                                                                              

[H3C]dis stp                                                                                                                        

STP is not configured.                                                                                                             

[H3C]                                                                                                                               

[H3C]                                                                                                                              

[H3C]dis process | in stp                                                                                                           

       531        531  0.0  0.0   S  120   N     ttyS0 00:00:00 grep -E stp                                                        

[H3C]                                                                                                                               

[H3C]                                                                                                                              

[H3C]                                                                                                                              

[H3C]stp global enable                                                                                                              

[H3C]%Jun  3 19:31:35:355 2011 H3C STP/6/STP_ENABLE: STP is now enabled on the device.                                             

%Jun  3 19:31:36:734 2011 H3C STP/6/STP_DETECTED_TC: Instance 0's port FortyGigE1/0/49 detected a topology change.                 

[H3C]dis process | in stp                                                                                                           

       532        532  3.9  0.0   S  110   N        -  00:00:03 stpd                                                               

       540        540  0.0  0.0   S  120   N     ttyS0 00:00:00 grep -E stp                                                         

[H3C]                                                                                                                              

[H3C]dis stp                                                                                                                       

-------[CIST Global Info][Mode MSTP]-------                                                                                         

 Bridge ID           : 32768.50da-00eb-45ba                                                                                        

 Bridge times        : Hello 2s MaxAge 20s FwdDelay 15s MaxHops 20                                                                  

 Root ID/ERPC        : 32768.50da-00eb-45ba, 0                                                                                     

 RegRoot ID/IRPC     : 32768.50da-00eb-45ba, 0                                                                                      

 RootPort ID         : 0.0                                                                                                         

 BPDU-Protection     : Disabled                                                                                                     

 Bridge Config-                                                                                                                    

 Digest-Snooping     : Disabled                                                                                                     

 TC or TCN received  : 2                                                                                                           

 Time since last TC  : 0 days 0h:0m:9s                                                                                              

----[Port49(FortyGigE1/0/49)][FORWARDING]----                                                                                       

 Port protocol       : Enabled                                                                                                     

 Port role           : Designated Port                                                                                              

 Port ID             : 128.49                                                                                                      

 Port cost(Legacy)   : COnfig=auto, Active=1                                                                                       

 Desg.bridge/port    : 32768.50da-00eb-45ba, 128.49                                                                                

 Port edged          : COnfig=disabled, Active=disabled                                                                             

 Point-to-Point      : COnfig=auto, Active=true                                                                                    

 Transmit limit      : 10 packets/hello-time                                                                                        

 TC-Restriction      : Disabled                                                                                                    

 Role-Restriction    : Disabled                                                                                                     

[H3C]                                                                                                                              

[H3C]undo stp global enable                                                                                                         

[H3C]%Jun  3 19:31:58:757 2011 H3C STP/6/STP_DISABLE: STP is now disabled on the device.                                           

[H3C]dis process | in stp                                                                                                          

       532        532  0.0  0.0   S  110   N        -  00:00:04 stpd                                                                

       547        547  0.0  0.0   S  120   N     ttyS0 00:00:00 grep -E stp                                                        

[H3C]dis stp                                                                                                                        

 Protocol status    : Disabled                                                                                                     

 Protocol Std.      : IEEE 802.1s                                                                                                   

 Version            : 3                                                                                                            

 Bridge-Prio.       : 32768                                                                                                         

 MAC address        : 50da-00eb-45ba                                                                                               

 Max age(s)         : 20                                                                                                            

 Forward delay(s)   : 15                                                                                                           

 Hello time(s)      : 2                                                                                                            

 Max hops           : 20                                                                                                           

 TC Snooping        : Disabled                                                                                                     

（3）进一步确认，部分设备启动后从来没有配置stp，会显示not configured，启动一次stp，然后关掉，才会显示Disabled。

因此，综合以上排查，可以确认现场stp显示异常并非故障。无需进行处理。