8510 100% CPU Utilization due to IP Input

spartain · ‎12-06-2005

I am having a problem with a 8510 that is running 12.1(22) the problem is that we can only get it to pass about 4mb if traffic before it chokes and starts dropping packets. I am going to include the sh ip interface and sh int stats. I was noticing that all the packets are process switched. I cannot enable IP Fast Switching on the DS3 interfaces. Dont know if I should be able to or not. I read that it is ASIC switched so this would make sense...

Any help would be GREATLY appreciated.

ATM1/0/2

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 1042133 55233049 39462393 2091506829

Route cache 0 0 0 0

Total 1042133 55233049 39462393 2091506829

ATM1/0/3

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 1927485 102156705 39454111 2091067883

Route cache 0 0 0 0

Total 1927485 102156705 39454111 2091067883

ATM1/1/0

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 14187520 751938560 9521193 504623229

Route cache 0 0 0 0

Total 14187520 751938560 9521193 504623229

spartain · ‎12-07-2005

After doing some reading I have come across a page here on cisco's site that says with a ARM 1 you only want to use multipoint configured sub interfaces as the point-to-point routes all the traffic by the processor which would drive up the processor utilization. I am pasting the configs of these interfaces below (Subs) in which i am using point-to-point for all of them. I am going to test by configuring one to multipoint to see if this fixes my problem.

interface ATM0.3 point-to-point

ip address 1.2.254.18 255.255.255.252

atm pvc 0 250 pd on encap aal5snap interface ATM1/0/1 1 74

!

interface ATM0.10 point-to-point

ip address 1.2.254.13 255.255.255.252

atm pvc 0 146 pd on encap aal5snap interface ATM1/1/0 1 73

!

interface ATM0.30 point-to-point

ip address 1.2.254.38 255.255.255.252

atm pvc 0 150 encap aal5snap interface ATM1/0/2 1 76

!

interface ATM0.40 point-to-point

ip address 1.2.254.2 255.255.255.252

atm pvc 0 152 pd on encap aal5snap interface ATM1/0/3 1 75

if you guys could look these over to see if anything else stands out that would be great.

Thanks again,

Mike