I am facing a weird problem in 7206VXR-NPEG1 router. The router has a STM1 interface to WAN facing side and onboard gigi interfaces on LAN side.
CPU of the router goes only high during peak production hours. CPU is constanly in 70% and maximum CPU goes till 92% when the traffic of STM1 is around 50-55Mbps and above. When the traffic of STM1 drops below 40Mbps then CPU also drops down to 50% and during night time when the traffic of STM1 drops around 20Mbps then CPU comes down to 20-30%. It infers the CPU is heavily based on the traffic flowing through it and not on any specific protocols or processes, it is only due to interrupts.
show process cpu shows most of the CPU is due to the interrupt and no single process is holding high CPU. Of course I could see BGP (scanner and event) and OSPF is showing as top contributor (around 4%) of CPU to the total 80% which I think is very negligible. The IOS that I have has BGP Next Hop tracking feature enabled so CPU due to BGP scanner is not an issue.
The router is running "c7200-adventerprisek9-mz.122-33.SRC6.bin".
The config in POS interface is below:
ip address x.x.x.x x.x.x.x
no ip proxy-arp
ip pim sparse-mode
ip ospf message-digest-key 1 md5 7 xxxxxxxxxxxxx
ip ospf cost 50
mpls traffic-eng tunnels
no cdp enable
service-policy output Service_Queues
Since POS interface is MPLS enabled, show interface switching does not show much increase in MPLS process but still I could see IP process counters are increasing. Let me do a bug scrub for this image. I have another POS interface in the same router which is not used, can i try shifting the link to that interface and see (as I said though it sounds weird, i m running out of options and want to figure out any hardware related issues either PA card or on the chassis slot).
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