High CPU Utilization in 7603 router with RSP720-10GE
We have a 7603 router with "RSP720-10GE" and we have high cpu utilization due to high amount of interrupts.
The output of “show cef drop” and “show ip cef switching statistics” commands show lots of packets that have been dropped by CEF.
But CEF is enabled on every physical interfaces and on every GRE tunnel that we have on this router.
As I understand the output of “show ip cef switching statistics” command shows some of the reasons for CEF dropping packets like “Routed to Null0” but I don’t know how to solve them. For example I can’t delete routes to Null0 because it’s going to cause routing loops in our network. Could you please help me
The output shows high interrupt to CPU, So collect the last output multiple times to see if the DROP values are incrementing. Also configure NetDr captures to see what packets are punted to CPU. I am adding a link for same:
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...