robertnclemens
1 Copper

Dell PCT6224 High CPU usage. Large ARP table. Dropping packets.

Dell PCT6224 running 3.2.1.3.

I have 11 vlans currently setup for the switch. This switch is our routing switch between all vlans.
Each vlan is a remote physical site.

We just moved from an old Cisco router network to a dell switched network via fiber ont.
When we did it everything was working great. Now during the work day with all of our computers
on and running I am seeing high cpu that I was not seeing previously and the arp table is huge.
I'm under the assumption that those are linked. ipMapForwardingTask is the process listed below
that eats up the cpu. When the cpu hits max, we are dropping packets between vlans. 


Is there a way I should relieve the cpu load on the 6224? Should I be seeing an arp entry for absolutely
every device on my network on this 6224? Is this related to proxy-arp or local-proxy-arp?

I can paste my config but it really is nothing spectacular. The vlans look exactly like this:

interface vlan 100
name VLAN100
routing
ip address 172.30.0.1 255.255.255.0
ip mtu 1500
exit

 

console#show arp

Age Time (seconds)............................. 1200
Response Time (seconds)........................ 1
Retries........................................ 4
Cache Size..................................... 1024
Dynamic Renew Mode ............................ Disable
Total Entry Count Current / Peak .............. 914 / 1024
Static Entry Count Configured / Active / Max .. 0 / 0 / 64

console# show process cpu
CPU Utilization:
 PID     Name                     5 Sec    1 Min    5 Min
---------------------------------------------------------
 332e5b0 tNetTask                 0.15%    0.14%    0.02%
 351aa70 ipnetd                   0.00%    0.02%    0.00%
 352d010 tXbdService              0.00%    0.06%    0.05%
 3548050 osapiTimer               1.27%    1.16%    1.31%
 3637760 bcmL2X.0                 0.95%    0.83%    0.87%
 364c150 bcmCNTR.0                0.15%    0.23%    0.29%
 3681c70 bcmTX                    0.47%    0.51%    0.72%
 3c78ec0 bcmRX                    4.61%    3.90%    4.26%
 3cb4900 bcmATP-RX                0.00%    0.02%    0.00%
--More-- or (q)uit
 3eaf0f0 MAC Send Task            0.63%    0.88%    0.72%
 3eb85f0 MAC Age Task             0.47%    0.21%    0.23%
 497cda0 USL Worker Task          0.00%    0.28%    0.17%
 4a38c60 bcmLINK.0                0.79%    0.35%    0.64%
 4cc30f0 LOG                      0.00%    0.00%    0.15%
 512fd90 tL7Timer0                0.00%    0.02%    0.00%
 5155670 osapiMonTask             2.70%    0.41%    0.16%
 5e442a0 simPts_task              0.00%    0.02%    0.15%
 6278700 dtlTask                  4.45%    3.41%    3.83%
 6281d00 dtlAddrTask              0.00%    0.10%    0.06%
 62e0ff0 hapiRxTask               1.58%    1.81%    2.33%
 632bf40 tEmWeb                   0.00%    0.04%    0.30%
 662f920 hapiL3AsyncTask          0.47%    0.43%    0.36%
 692add0 DHCP snoop               0.00%    0.02%    0.00%
 69c12e0 Dynamic ARP Inspection   0.00%    0.04%    0.00%
 69cb6d0 SNMPTask                 0.15%    0.09%    0.15%
 76006f0 dot1s_timer_task         0.15%    0.36%    0.45%
 7614210 dot1s_task               0.00%    0.04%    0.00%
 7d975b0 Dot1s transport task     0.00%    0.02%    0.00%
 8428e20 tacacs_rx_task           0.00%    0.02%    0.00%
 843a980 unitMgrTask              0.00%    0.04%    0.00%
 9460680 sFlowTask                0.00%    0.10%    0.02%
 9590d20 ipMapForwardingTask     72.49%   48.70%   49.62%
 95b7030 tRipTask                 0.00%    0.02%    0.00%
 96798d0 tArpCallback             0.15%    0.04%    0.01%
 97dbc10 ARP Timer                0.15%    0.11%    0.17%
 9fb5350 pktRcvrTask              0.15%    0.02%    0.00%
 c88d580 lldpTask                 0.15%    0.14%    0.17%
 cfcc6f0 tCptvPrtl                0.00%    0.02%    0.30%
 d4542e0 isdpTask                 0.00%    0.02%    0.00%
 dc55ab0 RMONTask                 0.31%    0.13%    0.01%
 dc62150 boxs Req                 0.00%    0.06%    0.15%
 e1b4960 sshd                     0.15%    0.02%    0.15%
---------------------------------------------------------
 Total CPU Utilization           92.54%   64.84%   67.82%

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Anaraendil
2 Iron

Re: Dell PCT6224 High CPU usage. Large ARP table. Dropping packets.

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