CE6870 port usage get high randomly when receives TC BPDU

Latest reply: May 10, 2018 14:09:11 615 1 0 0
 Issue Description
Customer feedabck that the usage of CE6870 get 100% randomly and there are packets dropped.
Apr  1 2018 07:43:17+05:30 SYSCON_NETMAGIC_CORE_SWITCH %DEVM/4/hwIfMonitorOutputRateRising_active(l):CID=0x80fc0101-alarmID=0x081300af;Interface output flow bandwidth usage exceeded the trap threshold. (Interface=19, BandWidthUsage=100, TrapThreshold=90, InterfaceName=10GE1/0/15)
Apr  1 2018 07:43:19+05:30 SYSCON_NETMAGIC_CORE_SWITCH %DEVM/4/hwIfMonitorOutputRateRising_active(l):CID=0x80fc0101-alarmID=0x081300af;Interface output flow bandwidth usage exceeded the trap threshold. (Interface=17, BandWidthUsage=91, TrapThreshold=90, InterfaceName=10GE1/0/13)
transparent.gif Alarm Information
Apr  1 2018 07:43:17+05:30 SYSCON_NETMAGIC_CORE_SWITCH %DEVM/4/hwIfMonitorOutputRateRising_active(l):CID=0x80fc0101-alarmID=0x081300af;Interface output flow bandwidth usage exceeded the trap threshold. (Interface=19, BandWidthUsage=100, TrapThreshold=90, InterfaceName=10GE1/0/15)
Apr  1 2018 07:43:19+05:30 SYSCON_NETMAGIC_CORE_SWITCH %DEVM/4/hwIfMonitorOutputRateRising_active(l):CID=0x80fc0101-alarmID=0x081300af;Interface output flow bandwidth usage exceeded the trap threshold. (Interface=17, BandWidthUsage=91, TrapThreshold=90, InterfaceName=10GE1/0/13)
transparent.gif Handling Process

1. Checking the log information of the switch, there are many TC protection enable record, it means that there are many TC BPDU receives by the CE6870. After receive TC BPDU, the mac address table and arp table will be refreshed. After refresh the mac address table and arp table, there will be broadcast to learn mac and arp again, that cause the traffic increase on the ports.

Apr  1 2018 06:59:45+05:30 SYSCON_NETMAGIC_CORE_SWITCH %MSTP/4/MSTPLOG_PROTC_GUARDED(l):CID=0x80542724;With the TC protection enabled, if TC BPDUs were received after the number of TC BPDUs received by an instance exceeded the threshold, these TC BPDUs were processed after the TC protection time expires. (ProcessID=0, InstanceID=1)

2. Checking the log record, there are many bandwidth usage exceeded record and the timing match the TC BPDU receives. 

Apr  1 2018 07:43:17+05:30 SYSCON_NETMAGIC_CORE_SWITCH %DEVM/4/hwIfMonitorOutputRateRising_active(l):CID=0x80fc0101-alarmID=0x081300af;Interface output flow bandwidth usage exceeded the trap threshold. (Interface=19, BandWidthUsage=100, TrapThreshold=90, InterfaceName=10GE1/0/15)
Apr  1 2018 07:43:19+05:30 SYSCON_NETMAGIC_CORE_SWITCH %DEVM/4/hwIfMonitorOutputRateRising_active(l):CID=0x80fc0101-alarmID=0x081300af;Interface output flow bandwidth usage exceeded the trap threshold. (Interface=17, BandWidthUsage=91, TrapThreshold=90, InterfaceName=10GE1/0/13)

3. After confgire stp flush disable, the port usage become stable. After add this configuration, when the switch receives TC BPDU, it will not refresh the mac address table and arp table, so there will be no broadcast.

<HUAWEI> system-view
[~HUAWEI] stp flush disable
transparent.gif Root Cause

After receive TC BPDU, the mac address table and arp table will be refreshed. After refresh the mac address table and arp table, there will be broadcast to learn mac and arp again, that cause the traffic increase on the ports. Root cause is that find out the TC resource and fix it. 

transparent.gif Solution
1. After confgire stp flush disable, the port usage become stable. After add this configuration, when the switch receives TC BPDU, it will not refresh the mac address table and arp table, so there will be no broadcast.

<HUAWEI> system-view
[~HUAWEI] stp flush disable

2. Use command display stp global to find out the TC resource and fix it.
<HUAWEI> display stp global
Protocol Status            :Enabled                                                                                                 
Bpdu-filter default        :Disabled                                                                                                
Tc-protection              :Enabled                                                                                                 
Tc-protection threshold    :1                                                                                                       
Tc-protection interval     :2s                                                                                                      
Edged port default         :Disabled                                                                                                
Pathcost-standard          :Dot1T                                                                                                   
Timer-factor               :3                                                                                                       
Transmit-limit             :6                                                                                                       
Bridge-diameter            :7                                                                                                       
CIST Global Information:                                                                                                            
  Mode                :MSTP                                                                                                         
  CIST Bridge         :32768.0019-7459-3301                                                                                         
  Config Times        :Hello 2s MaxAge 20s FwDly 15s MaxHop 20                                                                      
  Active Times        :Hello 2s MaxAge 20s FwDly 15s MaxHop 20                                                                      
  CIST Root/ERPC      :32768.0019-7459-3301 / 0 (This bridge is the root)                                                           
  CIST RegRoot/IRPC   :32768.0019-7459-3301 / 0 (This bridge is the root)                                                           
  CIST RootPortId     :0.0                                                                                                          
  BPDU-Protection     :Disabled                                                                                                     
  TC or TCN received  :9                                                                                                            
  TC count per hello  :0                                                                                                            
  STP Converge Mode   :Normal                                                                                                       
  Share region-configuration :Enabled                                                                                               
  Time since last TC  :0 days 1h:37m:17s                                                                                            
  Number of TC        :10                                                                                                           
  Last TC occurred    :10GE4/0/12                                                                                                   
  Topo Change Flag    :0

  • x
  • convention:

Created May 10, 2018 14:09:11 Helpful(0) Helpful(0)

..............CE6870 port usage get high randomly when receives TC BPDU-2662211-1
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