Hi All ,

im facing a high cpu usage for PowerConnect Switch , all time the cpu is around to be full in logs i can see alot of messages about invalid BPDU , my core switch is alcatel with rstp 

cons0#show spanning-tree
Spanning tree :Enabled - BPDU Flooding :Disabled - Portfast BPDU filtering :Disabled - mode :rstp
CST Regional Root: 80:00:D0:67:E5:8C:C7:9C
Regional Root Path Cost: 0
ROOT ID
Priority 4096
Address 2CFA.A28A.1F0F
Path Cost 1000
Root Port Po1
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec TxHoldCount 6 sec
Bridge Max Hops 20
Bridge ID
Priority 32768
Address D067.E58C.C79C
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Interfaces

<187> SEP 21 13:15:03 192.168.2.178-2 DOT1S[163124192]: dot1s_txrx.c(192) 39844 %% dot1sBpduReceive(): Discarding the BPDU, since it is an invalid BPDU type
<187> SEP 21 13:14:59 192.168.2.178-2 DOT1S[163124192]: dot1s_txrx.c(192) 39843 %% dot1sBpduReceive(): Discarding the BPDU, since it is an invalid BPDU type

cons0#show process cpu

Memory Utilization Report

status bytes
------ ----------
free 170879688
alloc 297844984

CPU Utilization:

PID Name 5 Secs 60 Secs 300 Secs
-----------------------------------------------------------------
40f5f70 tExcTask 0.00% 0.03% 0.01%
41b0360 tTffsPTask 0.60% 0.37% 0.31%
41cd7d0 tNet0 2.00% 1.20% 1.12%
41db298 tXbdService 0.00% 0.01% 0.00%
43e3090 ipnetd 0.00% 0.00% 0.02%
43fddb8 tIomEvtMon 0.00% 0.04% 0.07%
44075b0 osapiTimer 10.02% 9.38% 8.85%
4618550 bcmL2X.0 0.40% 0.42% 0.40%
--More-- or (q)uit
463ee10 bcmCNTR.0 0.80% 0.78% 0.87%
4692780 bcmTX 1.40% 1.63% 1.46%
4d4fda0 bcmRX 11.42% 11.82% 12.47%
4d6ff58 bcmNHOP 0.20% 0.13% 0.20%
4d82810 bcmATP-TX 11.62% 9.78% 8.80%
4d8bd10 bcmATP-RX 0.00% 0.06% 0.13%
5341be0 MAC Send Task 0.20% 0.18% 0.21%
534b0e0 MAC Age Task 0.00% 0.42% 0.84%
5d68f20 bcmLINK.0 2.60% 2.10% 2.23%
5fa5528 cpuUtilMonitorTask 0.00% 0.01% 0.01%
84cf000 tL7Timer0 0.40% 0.15% 0.14%
84eb400 osapiWdTask 0.00% 0.06% 0.06%
84f9e00 serialInput 0.00% 0.02% 0.03%
9609d50 servPortMonTask 0.00% 0.03% 0.05%
977b5b8 portMonTask 0.00% 0.04% 0.04%
97a2b20 simPts_task 0.20% 0.40% 0.44%
9b913e0 dtlTask 12.02% 13.03% 13.19%
9de5088 emWeb 0.00% 0.00% 0.05%
a1ecf80 hapiRxTask 9.81% 10.89% 11.17%
abf0c40 DHCP snoop 0.40% 0.13% 0.08%
ac8c550 Dynamic ARP Inspect 0.00% 0.00% 0.02%
ac9e240 SNMPTask 0.00% 0.00% 0.01%
acf07e0 SNMPCTTask 0.00% 0.01% 0.00%
--More-- or (q)uit
aee46a0 EDB Trap 0.00% 0.00% 0.01%
bb09e60 dot1s_timer_task 0.40% 0.71% 0.98%
bb1a120 dot1s_task 0.00% 0.03% 0.03%
bddbbc8 dot1xTimerTask 0.00% 0.00% 0.02%
c545068 radius_task 0.00% 0.08% 0.08%
c5ae590 tacacs_rx_task 0.00% 0.02% 0.02%
c5c1120 unitMgrTask 0.00% 0.05% 0.11%
c5eb6c0 umWorkerTask 0.00% 0.01% 0.03%
c7a3210 snoopTask 13.62% 10.47% 9.51%
c826850 dot3ad_timer_task 0.00% 0.04% 0.04%
d1a8ab0 dhcpsPingTask 0.20% 0.28% 0.25%
d1b24a0 SNTP 0.00% 0.01% 0.01%
d500510 sFlowTask 0.00% 0.00% 0.01%
d72ebf0 spmTask 0.00% 0.03% 0.08%
d8e4f18 ipMapForwardingTask 10.02% 10.06% 10.01%
e2b9890 tRtrDiscProcessingT 0.00% 0.00% 0.01%
ea3fce0 mgmdMapTask 0.00% 0.04% 0.01%
12c8a630 iscsiTask 0.80% 1.29% 1.46%
12ccedd8 ip6MapLocalDataTask 0.60% 0.61% 0.51%
12e3d418 lldpTask 0.00% 0.18% 0.18%
140d8b38 dnsRxTask 0.00% 0.00% 0.01%
1419a4e0 DHCPv4 Client Task 0.00% 0.01% 0.01%
141ae018 isdpTask 0.00% 0.06% 0.11%
--More-- or (q)uit
1443a3c8 RMONTask 0.20% 0.13% 0.15%
1444c000 boxs Req 0.00% 0.07% 0.08%
14d81b28 FIP snoop 0.20% 0.05% 0.04%
-----------------------------------------------------------------
Total CPU Utilization 90.18% 87.63% 87.34%

could you please help me in this ?