4500 - CPU Utilization 100%

Answered Question
Feb 22nd, 2011

Hello

Our Cisco 4500 box shows high CPU Utilization ; no changes done on software or any hardware added.

The Box got Three modules.

1. Supervisor Engine

2. Ethernet Module 24 ports 10/100/1000

3. Fiber module 6 ports   ( 5 ports used - connected to Access switches )

Any help to check what is causing the issue.

cheers

Anthony

I have this problem too.
0 votes
Correct Answer by manisharora111 about 3 years 1 month ago

Ok , You need to draw a complete diagram showing Physical connectivity between all of your switches for people to understand and tell what links needs to be blocked by STP.

The error messages that you are seeing are :-

00:26:31: %C4K_EBM-4-HOSTFLAPPING: Host 00:0F:FE:2C:55:5A in vlan 1 is flapping between port Gi3/3 and port Gi5/13
00:26:31: %C4K_EBM-4-HOSTFLAPPING: Host 00:30:05:CC:1E:11 in vlan 1 is flapping between port Gi3/3 and port Gi2/1

which means that the switch saw same mac address Host 00:0F:FE:2C:55:5A  on port gi 3/3 and gi 5/13 which means that there is a loop some where in your architecture. It similary says that it saw same mac on port Gi3/3 and port Gi2/1.

Manish

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anthony.dyne Tue, 02/22/2011 - 11:07

thanks for sharing the link

Our issue point to this output but unable to overcome, any input

show processes cpu
CPU utilization for five seconds: 99%/0%; one minute: 99%; five minutes: 99%
PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
   1           0        11          0  0.00%  0.00%  0.00%   0 Chunk Manager
   2        9716    632814         15  0.00%  0.00%  0.00%   0 Load Meter
   3         780       302       2582  0.00%  0.00%  0.00%   0 SpanTree Helper

!--- Output suppressed.

  23       18208   3154201          5  0.00%  0.00%  0.00%   0 TTY Background
  24       37208   3942818          9  0.00%  0.00%  0.00%   0 Per-Second Jobs
  25     1046448    110711       9452  0.00%  0.03%  0.00%   0 Per-minute Jobs
  26   175803612 339500656        517  4.12%  4.31%  4.48%   0 Cat4k Mgmt HiPri
  27   835809548 339138782       2464 86.81% 89.20% 89.76%   0 Cat4k Mgmt LoPri
  28       28668   2058810         13  0.00%  0.00%  0.00%   0 Galios Reschedul

manisharora111 Tue, 02/22/2011 - 11:15

Hi,

Can you please post :-

1> sh platform health

2> sh platform cpu packet statis

Manish

anthony.dyne Tue, 02/22/2011 - 11:40

Hi

Now the show processes indicates 9% ; but soon it will be back to 99%

ESW#show platform health
                     %CPU   %CPU    RunTimeMax   Priority  Average %CPU  Total
                     Target Actual Target Actual   Fg   Bg 5Sec Min Hour  CPU
Lj-poll                1.00   0.00      2      0  100  500    0   0    0  0:03
GalChassisVp-review    3.00   0.07     10     94  100  500    0   0    0  0:27
S2w-JobEventSchedule  10.00   0.96     10     13  100  500    0   0    0  5:54
Stub-JobEventSchedul  10.00   1.40     10     21  100  500    1   1    1  7:47
Pim-review             0.10   0.00      1      0  100  500    0   0    0  0:01
Ebm-host-review        1.00   0.06      8      6  100  500    0   0    0  0:10
Ebm-port-review        0.10   0.00      1      0  100  500    0   0    0  0:00
Protocol-aging-revie   0.20   0.00      2      0  100  500    0   0    0  0:00
Acl-Flattener          1.00   0.00     10      0  100  500    0   0    0  0:00
KxAclPathMan create/   1.00   0.00     10      5  100  500    0   0    0  4:05
KxAclPathMan update    2.00   0.00     10      0  100  500    0   0    0  0:00
KxAclPathMan reprogr   1.00   0.00      2      0  100  500    0   0    0  0:00
TagMan-InformMtegRev   1.00   0.00      5      0  100  500    0   0    0  0:00
TagMan-RecreateMtegR   1.00   0.00     10      0  100  500    0   0    0  0:00
K2CpuMan Review       30.00   1.85     30     61  100  500    1   1    1  21:30
K2AccelPacketMan: Tx  10.00   0.34     20      0  100  500    0   0    0  2:05
K2AccelPacketMan: Au   0.10   0.00      0      0  100  500    0   0    0  0:00
K2AclMan-taggedFlatA   1.00   0.00     10      0  100  500    0   0    0  0:00
K2AclCamMan stale en   1.00   0.00     10      0  100  500    0   0    0  0:00
K2AclCamMan hw stats   3.00   0.20     10      5  100  500    0   0    0  2:31
K2AclCamMan kx stats   1.00   0.00     10      5  100  500    0   0    0  1:01
K2AclPolicerTableMan   1.00   0.00     10      0  100  500    0   0    0  0:01
K2L2 Address Table R   2.00   0.74     10      8  100  500    0   0    0  2:20
K2L2 New Static Addr   2.00   0.00     10      3  100  500    0   0    0  0:00
K2L2 New Multicast A   2.00   0.00     10      6  100  500    0   0    0  0:00
K2L2 Vlan Table Revi   2.00   0.00     12      8  100  500    0   0    0  0:01
K2 L2 Destination Ca   2.00   0.00     10      0  100  500    0   0    0  0:00
K2PortMan Review       2.00   2.29     15     11  100  500    1   1    1  8:49
Gigaport0 Review       0.40   0.05      4      1  100  500    0   0    0  0:15
Gigaport1 Review       0.40   0.04      4     16  100  500    0   0    0  0:15
Gigaport2 Review       0.40   0.03      4      1  100  500    0   0    0  0:15
Gigaport3 Review       0.40   0.03      4     33  100  500    0   0    0  0:15
Gigaport4 Review       0.40   0.04      4     18  100  500    0   0    0  0:15
Gigaport5 Review       0.40   0.03      4      1  100  500    0   0    0  0:15
Gigaport6 Review       0.40   0.16      4      0  100  500    0   0    0  0:58
Gigaport7 Review       0.40   0.15      4      0  100  500    0   0    0  0:56
Gigaport8 Review       0.40   0.02      4      0  100  500    0   0    0  0:13
Gigaport9 Review       0.40   0.04      4      0  100  500    0   0    0  0:13
Gigaport10 Review      0.40   0.04      4      0  100  500    0   0    0  0:13
Gigaport11 Review      0.40   0.03      4      0  100  500    0   0    0  0:13
Gigaport12 Review      0.40   0.16      4      0  100  500    0   0    0  0:55
Gigaport13 Review      0.40   0.13      4      0  100  500    0   0    0  0:51
Gigaport14 Review      0.40   0.13      4      0  100  500    0   0    0  0:52
Gigaport15 Review      0.40   0.13      4      0  100  500    0   0    0  0:52
Gigaport16 Review      0.40   0.03      4      1  100  500    0   0    0  0:15
Gigaport17 Review      0.40   0.03      4      1  100  500    0   0    0  0:15
Gigaport18 Review      0.40   0.03      4      1  100  500    0   0    0  0:15
Gigaport19 Review      0.40   0.04      4     21  100  500    0   0    0  0:15
Gigaport20 Review      0.40   0.04      4     16  100  500    0   0    0  0:14
Gigaport21 Review      0.40   0.02      4     16  100  500    0   0    0  0:13
Gigaport22 Review      0.40   0.05      4     18  100  500    0   0    0  0:15
Gigaport23 Review      0.40   0.02      4     19  100  500    0   0    0  0:13
Gigaport24 Review      0.40   0.13      4      0  100  500    0   0    0  0:52
Gigaport25 Review      0.40   0.13      4      0  100  500    0   0    0  0:50
Gigaport26 Review      0.40   0.13      4      0  100  500    0   0    0  0:50
Gigaport27 Review      0.40   0.13      4      0  100  500    0   0    0  0:51
Gigaport28 Review      0.40   0.16      4      0  100  500    0   0    0  0:57
Gigaport29 Review      0.40   0.13      4      0  100  500    0   0    0  0:52
Gigaport30 Review      0.40   0.03      4      0  100  500    0   0    0  0:13
Gigaport31 Review      0.40   0.04      4      0  100  500    0   0    0  0:13
K2Fib cam usage revi   2.00   0.00     15      0  100  500    0   0    0  0:00
K2Fib IrmFib Review    2.00   0.00     15      7  100  500    0   0    0  0:00
K2Fib AdjRepop Revie   2.00   0.00     15      0  100  500    0   0    0  0:00
K2Fib Vrf Unpunt Rev   2.00   0.00     15      0  100  500    0   0    0  0:00
K2Fib Consistency Ch   1.00   0.04      5      3  100  500    0   0    0  0:30
K2FibAdjMan Stats Re   2.00   0.11     10      7  100  500    0   0    0  1:32
K2FibAdjMan Host Mov   2.00   0.00     10     10  100  500    0   0    0  1:16
K2FibAdjMan Adj Chan   2.00   0.00     10      0  100  500    0   0    0  0:00
K2FibMulticast Signa   2.00   0.01     10      2  100  500    0   0    0  0:14
K2FibMulticast Entry   2.00   0.00     10      6  100  500    0   0    0  0:00
K2FibMulticast Irm M   2.00   0.00     10      7  100  500    0   0    0  0:00
K2FibFastDropMan Rev   2.00   0.00      7      0  100  500    0   0    0  0:00
K2FibPbr route map r   2.00   0.10     10      5  100  500    0   0    0  1:01
K2FibPbr flat acl pr   2.00   0.01     10      1  100  500    0   0    0  0:14
K2FibPbr consolidati   2.00   0.00     10      0  100  500    0   0    0  0:01
K2FibPerVlanPuntMan    2.00   0.00     15      1  100  500    0   0    0  0:00
K2FibFlowCache flow    2.00   0.00     10      0  100  500    0   0    0  0:04
K2FibFlowCache flow    2.00   0.00     10      0  100  500    0   0    0  0:00
K2FibFlowCache adj r   2.00   0.00     10      0  100  500    0   0    0  0:05
K2MetStatsMan Review   2.00   0.06      5      2  100  500    0   0    0  1:51
K2FibMulticast MET S   2.00   0.00     10      0  100  500    0   0    0  0:00
K2QosDblMan Rate DBL   2.00   0.02      7      0  100  500    0   0    0  0:09
IrmFibThrottler Thro   2.00   0.00      7      2  100  500    0   0    0  0:02
K2 VlanStatsMan Revi   2.00   0.54     15      3  100  500    0   0    0  4:18
K2 L2 Aging Table Re   2.00   0.12     20      3  100  500    0   0    0  0:50
RkiosPortMan Port Re   2.00   0.17     12      8  100  500    0   0    0  0:52
Rkios Module State R   4.00   0.00     40     10  100  500    0   0    0  0:03
RkiosIpPbr IrmPort R   2.00   0.01     10      1  100  500    0   0    0  0:14
RkiosAclMan Review     3.00   0.01     30      0  100  500    0   0    0  0:04
MatMan Review          0.50   0.00      4      0  100  500    0   0    0  0:00
EthHoleLinecardMan(1   2.00   0.01     10      0  100  500    0   0    0  0:03
EthHoleLinecardMan(2   2.00   0.51     10     11  100  500    0   0    0  2:50
EthHoleLinecardMan(3   2.00   0.40     10     11  100  500    0   0    0  2:50
                     -------------
%CPU Totals          170.80  12.71

                       Allocation ceiling        Current allocation
                       ------------------        ------------------
                       kbytes    % in use        kbytes    % in use

Linecard 1's Store        258.00       3%                8.65      100%
Linecard 2's Store        258.00       3%                9.58      100%
Linecard 3's Store        258.00       3%                9.58      100%
Linecard 4's Store        258.00       0%                0.00        0%
Linecard 5's Store        258.00      62%              161.08      100%
Linecard 6's Store        258.00       0%                0.00        0%
TSM objects            ------------------        ------------------
RkiosSysPacketBuf         250.00       0%              250.00        0%
PacketBufRaw            20355.00     100%            20355.00      100%
PacketBufRawJumbo         732.81      25%              183.20      100%
Packet                   1026.56       0%             1026.56        0%
PacketInfoItem            390.62       0%                1.95        0%
VbufNodes2400              80.75       0%               20.18        0%
VbufNodes1600              55.75       0%               13.93        0%
VbufNodes400               73.00       3%               18.25       15%
VbufNodes64                62.00       0%               31.00        0%
PimPhyports              1023.43      24%              413.46       60%
PimPorts                  843.75      31%              394.87       66%
PimModules                202.00       1%               12.62       25%
PimSlots                    4.00       2%                0.25       37%
PimChassis                  2.25       6%                1.12       12%
EbmVlans                 2432.00       0%               59.37       19%
EbmVlanHostEntrys        2176.00       0%               68.00       16%
EbmVlanGroupEntrys       1920.00       0%               60.00        3%
EbmPorts                  216.00      30%               67.50       96%
EbmPortHostEntrys         384.00       0%               24.00        0%
EbmIeNodes                540.00       0%                5.27       80%
EbmPortVlanAclFeatur       31.99       0%                0.49        0%
EbmSortedHostTableIt        1.87       0%                1.87        0%
EbmSortedGroupTableI        1.75       0%                1.75        0%
IrmVrfs                    45.00       1%                0.70      100%
IrmFibAdjs                768.00       0%               96.00        5%
IrmPortEtherAddrEntr      375.00       0%              210.93        0%
IrmFibEntries            9216.00       0%              360.00        4%
AclL4Op                   384.00       0%              384.00        0%
AclL4OpTriplet            256.00       0%              256.00        0%
AclClassifier             768.00       0%              768.00        0%
AclFeature                604.50       0%              604.50        0%
Acl                       384.00       0%              384.00        0%
Ace                      1280.00       0%             1280.00        0%
AceActionDescStorage      256.00       0%                0.00        0%
AclListNode               256.00       0%              256.00        0%
AceListNode              1280.00       0%             1280.00        0%
AclClassifierActionL      512.00       0%              512.00        0%
AclLayerFeatureListN      512.00       0%              512.00        0%
FlatAcl                   512.00       0%              512.00        0%
FlatAce                  3840.00       0%             3840.00        0%
FlatAceActionListNod     7680.00       0%             7680.00        0%
FlatAclL4OpSetStorag     1024.00       0%             1024.00        0%
FlatAclCacheNode         1024.00       0%             1024.00        0%
QoS Policers              160.00       0%               40.00        0%
KxAclPath                1024.00       0%              128.00        0%
KxAclPathListNode         256.00       0%               32.00        0%
GalGbicEntrys              10.39       0%               10.39        0%
CommandTables              48.00      20%                9.70      100%
K2FibPbrExpandedFlat     2304.00       0%              144.00        0%
K2FibPbrFlatRouteMap      528.00       0%              528.00        0%
K2TxPacket                384.00       0%                0.75        0%
K2TxPacketInfo            256.00       0%                0.50        0%
MatEntrys                5376.00       0%              168.00        0%
MatEntryTableIterato        1.12       0%                1.12        0%
RkiosAclMan NamedGal      305.85       0%              305.85        0%
Rkios Acl VlanMaps        672.00       0%              672.00        0%
Rkios Acl VlanMapEnt     1093.75       0%             1093.75        0%
Rkios QoS PolicyMaps      322.00       0%               56.00        0%
Rkios QoS ClassMaps      4096.00       0%             4096.00        0%
AclToIosFilterMapLis      384.00       0%              384.00        0%
Rkios QoS Policers         32.00       0%                8.00        0%
Event Nodes                84.00       0%               80.00        0%
Event Nodes                84.00       1%               80.00        1%
KxAclTagPairNode         2304.00       0%             2304.00        0%
KxAclMappingTableEnt       96.02       0%               96.02        0%
KxAclMappingTableEnt       64.01       0%               64.01        0%
KxAclTaggedFlatAcl        768.00       0%              768.00        0%
RkisoIpPbrRouteMaps       566.40       0%                7.25        0%
IrmFlows                  256.00       0%               64.00        0%
                       ------------------        ------------------
TSM totals              85257.63      24%            55136.21       38%

******************************************************************************

ESW#show platform cpu packet statistics
Packets Dropped In Hardware By CPU Subport (txQueueNotAvail)

CPU Subport  TxQueue 0       TxQueue 1       TxQueue 2       TxQueue 3
------------ --------------- --------------- --------------- ---------------
           0               0               0               0         8428204
           2               0             115               0               0
           7               0               0               0             504

Packets Dropped In Processing Overall

Total                5 sec avg 1 min avg 5 min avg 1 hour avg
-------------------- --------- --------- --------- ----------
                4282         0         0         0          0

Packets Dropped In Processing by CPU event

Event             Total                5 sec avg 1 min avg 5 min avg 1 hour avg
----------------- -------------------- --------- --------- --------- ----------
Input Acl                          168         0         0         0          0
SA Miss                           4059         0         0         0          0

Packets Dropped In Processing by Priority

Priority          Total                5 sec avg 1 min avg 5 min avg 1 hour avg
----------------- -------------------- --------- --------- --------- ----------
Normal                              55         0         0         0          0
Medium                            4114         0         0         0          0
High                               168         0         0         0          0

Packets Dropped In Processing by Reason

Reason             Total                5 sec avg 1 min avg 5 min avg 1 hour avg
------------------ -------------------- --------- --------- --------- ----------
SrcAddrTableFilt                   4037         0         0         0          0
DstEntryDrop1                        10         0         0         0          0
DstEntryDrop2                        22         0         0         0          0
NoDstPorts                           45         0         0         0          0
NoFloodPorts                        168         0         0         0          0

Total packet queues 16

Packets Received by Packet Queue

Queue                  Total           5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Control                        1811137        52        51        50         50
Host Learning                  2890189         0         0         0          1
L3 Fwd Highest                       2         0         0         0          0
L3 Fwd High/Medium                   5         0         0         0          0
L3 Fwd Low                      294607         2         3         3          5
L2 Fwd High/Medium                 567         0         0         0          0
L2 Fwd Low                     1613832         5         5         5          6
L3 Rx Low                       291832         6         7         7          7
ACL fwd(snooping)               143535         0         0         0          0

Packets Dropped by Packet Queue

Queue                  Total           5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Host Learning                  1894518         0         0         0          0
L2 Fwd Low                     7238733         0         0         0          1
ACL fwd(snooping)                 3301         0         0         0          0

manisharora111 Tue, 02/22/2011 - 11:58

Can you please run these commands during high cpu usage ?

It would be easier to identify the root cause of the High cpu. Also, are you expierencing a constant STP topology change ? since there is a good amount of control traffic even with less cpu usage.

Manish

anthony.dyne Tue, 02/22/2011 - 12:00

Hi

I didnt get what you mean by " Also, are you expierencing a constant STP topology change ? since there  is a good amount of control traffic even with less cpu usage."

manisharora111 Tue, 02/22/2011 - 12:06

Hi Anthony,

"Queue                  Total           5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Control                        1811137        52        51        50         50 "

with high no. of host learning drops in the last of the show platform packet stat means :-

"This situation       is often the result of network topology instability. For example, if the       spanning-tree topology changes, the switch generates Topology Change       Notifications (TCNs). The issue of TCNs reduces the aging time to 15 seconds in       PVST+ mode. MAC address entries are flushed if the addresses are not learned       back within the time period. In the case of Rapid STP (RSTP) (IEEE 802.1w) or       MST (IEEE 802.1s), the entries immediately age out if the TCN comes from       another switch. This age out causes MAC addresses to be learned anew. This is       not a major issue if the topology changes are rare. But there can be an       excessive number of topology changes because of a flapping link, faulty switch,       or host ports that are not enabled for PortFast. A large number of MAC table       flushes and subsequent relearning can result. The next step in root cause       identification is to troubleshoot the network. The switch works as expected and       sends the packets to the CPU for host address learning. Identify and fix the       faulty device that results in excessive TCNs."

Please check this link out and compare the output of the commands when cpu usage is high with this documentations.

http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml

Manish

anthony.dyne Tue, 02/22/2011 - 12:12

enabling terminal monitor I start getting these

00:26:31: %C4K_EBM-4-HOSTFLAPPING: Host 00:0F:FE:2C:55:5A in vlan 1 is flapping between port Gi3/3 and port Gi5/13
00:26:31: %C4K_EBM-4-HOSTFLAPPING: Host 00:30:05:CC:1E:11 in vlan 1 is flapping between port Gi3/3 and port Gi2/1
00:26:32: %C4K_EBM-4-HOSTFLAPPING: Host 5C:FF:35:0A:55:BF in vlan 1 is flapping between port Gi3/3 and port Gi5/15
00:26:34: %C4K_EBM-4-HOSTFLAPPING: Host 00:30:05:CC:B6:F3 in vlan 1 is flapping between port Gi3/3 and port Gi2/1
00:26:34: %C4K_EBM-4-HOSTFLAPPING: Host 00:30:05:CC:B6:96 in vlan 1 is flapping between port Gi3/3 and port Gi2/1
00:26:35: %C4K_EBM-4-HOSTFLAPPING: Host 00:1A:A0:0D:D9:D3 in vlan 1 is flapping between port Gi3/3 and port Gi5/13
00:26:35: %C4K_EBM-4-HOSTFLAPPING: Host 00:0B:DB:B2:AE:10 in vlan 1 is flapping between port Gi3/3 and port Gi2/2
00:26:35: %C4K_EBM-4-HOSTFLAPPING: Host 00:30:05:CB:45:E4 in vlan 1 is flapping between port Gi3/3 and port Gi2/1
00:26:35: %C4K_EBM-4-HOSTFLAPPING: Host 00:24:81:1A:CE:EC in vlan 1 is flapping between port Gi3/3 and port Gi5/16
00:26:38: %C4K_EBM-4-HOSTFLAPPING: Host 00:14:22:54:FC:80 in vlan 1 is flapping between port Gi2/1 and port Gi3/3
00:26:38: %C4K_EBM-4-HOSTFLAPPING: Host 00:0F:FE:08:40:40 in vlan 1 is flapping between port Gi2/1 and port Gi3/3
00:26:38: %C4K_EBM-4-HOSTFLAPPING: Host 00:11:09:D9:73:12 in vlan 1 is flapping between port Gi2/1 and port Gi3/3
00:26:39: %C4K_EBM-4-HOSTFLAPPING: Host 00:08:02:0C:74:30 in vlan 1 is flapping between port Gi3/3 and port Gi2/1
00:26:39: %C4K_EBM-4-HOSTFLAPPING: Host 00:0F:FE:09:68:5C in vlan 1 is flapping between port Gi3/3 and port Gi2/1

Gi 3/3  is a trunk port

Gi 5/13 is a trunk port

Gi 3/3 -----------------------gi 0/0 [ 2960 ] gi 0/1 -------------------gi 0/0 [ 2960 ]

all switches are in client mode

4500 is server mode

donno what could be the issue

manisharora111 Tue, 02/22/2011 - 12:28

Can you please check your physical topology of how switches are interconnecte, the message and high cpu utilization with high no. of control messages and host learning indicate a STP loop in the switch fabric.

http://www.cisco.com/en/US/products/hw/switches/ps4324/products_tech_note09186a008063c36f.shtml#cg1

You mentioned that 3/3 and 5/13 are trunk ports , but where is 5/13 connected. I don't see it connected to any of your 2900 series.

Manish

anthony.dyne Tue, 02/22/2011 - 12:37

Slot 5 got 24 ports RJ 45 Ethernet module ( 10/100/1000 ) -

5/13 port -------------connects --------------------gi 0/0 ( 2960 )

inter fa 5/13

switchport trunk encapsulation dot1q

switchport mode trunk

on 2960

inter gi 0/0

switchport trunk encapsulation dot1q

switchport mode trunk

Correct Answer
manisharora111 Tue, 02/22/2011 - 12:50

Ok , You need to draw a complete diagram showing Physical connectivity between all of your switches for people to understand and tell what links needs to be blocked by STP.

The error messages that you are seeing are :-

00:26:31: %C4K_EBM-4-HOSTFLAPPING: Host 00:0F:FE:2C:55:5A in vlan 1 is flapping between port Gi3/3 and port Gi5/13
00:26:31: %C4K_EBM-4-HOSTFLAPPING: Host 00:30:05:CC:1E:11 in vlan 1 is flapping between port Gi3/3 and port Gi2/1

which means that the switch saw same mac address Host 00:0F:FE:2C:55:5A  on port gi 3/3 and gi 5/13 which means that there is a loop some where in your architecture. It similary says that it saw same mac on port Gi3/3 and port Gi2/1.

Manish

anthony.dyne Tue, 02/22/2011 - 12:55

spanning-tree mode rapid-vst

spanning-tree portfast bpduguard default

Are these commands gonna help to stop the loop

manisharora111 Tue, 02/22/2011 - 13:27

check your switches if they all are running spanning tree using sh spanning-tree or sh spantree , if not then enable spanning tree on them.

Manish

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