Dear community.
After using my cisco 2621 as my internet gateway, and upgrading my DSL connection to 20mbit/1mbit, my cpu usage has increased to almost 90%. These 90% are reached when i am downloading @ 15mbit/sec.
After issueing a 'show proc cpu sorted' command, the 80% cpu usage was not caused by any process, but by interrupts:
CPU utilization for five seconds: 87%/81%; one minute: 1%; five minutes: 3%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
41 68700 76661 896 0.95% 0.19% 0.16% 0 IP Input
I am already using 'ip cef' on both the FA interfaces. And issueing a 'sh int stat' command result in a very healthy routing proces if you ask me, if you look at the cache/proces ratio:
FastEthernet0/0
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 75394 6417511 46889 5303988
Route cache 415701 36392514 645159 763558263
Total 491095 42810025 692048 768862251
FastEthernet0/1
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 16157 3375901 27213 2645817
Route cache 639952 764440471 415434 37734183
Total 656109 767816372 442647 40380000
NIDWORKR01#sh ip cef sum
IP CEF with switching (Table Version 116), flags=0x0
94 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 0
94 leaves, 127 nodes, 144864 bytes, 119 inserts, 25 invalidations
0 load sharing elements, 0 bytes, 0 references
universal per-destination load sharing algorithm, id 3EDCA274
3(0) CEF resets, 1 revisions of existing leaves
Resolution Timer: Exponential (currently 1s, peak 1s)
1 in-place/0 aborted modifications
refcounts: 32828 leaf, 32768 node
Table epoch: 0 (94 entries at this epoch)
Adjacency Table has 90 adjacencies
81 IPv4 adjacencies
I have already followed the cisco doc which mentions the 'high cpu usage caused by interrupts'. These steps did not lead to decrease my cpu usage. Can anybody point me in a direction to troubleshoot the traffic that is causing this high cpu usage? Could this problem be CEF related?
Btw, IOS version 12.3(21)
Thanks in advance!
