04-12-2006 03:44 PM - edited 03-03-2019 02:47 AM
Hi,
Having a problem with traffic causing high CPU on 7204VXR (NPE400):
#sho processes cpu sorted
CPU utilization for five seconds: 48%/14%; one minute: 46%; five minutes: 26%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
72 2516700 15388329 163 32.76% 30.20% 16.10% 0 IP Input
42 47220 6815700 6 0.32% 0.32% 0.32% 0 Per-Second Jobs
cef is enbabled on all FE Ints.
!
interface FastEthernet2/0
description Crossover to ERT01-BNE
ip address xxx.xxx.xxx.xxx 255.255.255.252
ip route-cache same-interface
ip route-cache flow
ip ospf message-digest-key 10 md5 XXXXX
duplex full
mpls ip
service-policy output MPLS-EGRESS
!
#show ip interface fastEthernet 2/0
FastEthernet2/0 is up, line protocol is up
Internet address is xxx.xxx.xxx.xxx/30
Broadcast address is 255.255.255.255
Address determined by non-volatile memory
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Multicast reserved groups joined: 224.0.0.2 224.0.0.5 224.0.0.6
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Local Proxy ARP is disabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is enabled
IP Flow switching is enabled
IP CEF switching is enabled
IP Flow switching turbo vector
IP Flow CEF switching turbo vector
IP multicast fast switching is enabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast, Flow cache, CEF, Full Flow
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
RTP/IP header compression is disabled
Policy routing is disabled
Network address translation is disabled
BGP Policy Mapping is disabled
WCCP Redirect outbound is disabled
WCCP Redirect inbound is disabled
WCCP Redirect exclude is disabled
Just wondering what else I can check to further diagnose?
04-12-2006 04:03 PM
John,
Since CEF is enabled on all the interfaces, the cause has to be packets destined for the router itself. Do you run BGP on this router ? And if so, how many BGP sessions are configured ?
Paresh
04-12-2006 04:23 PM
Only iBGP for MPLS - Further diagnoses has revealed that it is only caused by traffic that is ingress to the router, and also terminates on the router - i.e. I have an L2TPv3 tunnel setup (Which terminates on Loopback on the router), traffic ingress to this router causes the CPU to go beserk(Which makes sense as the router has to deal with it....i.e. it cannot forward anywhere) - If I pump data in the other direction, the router terminating the other side of the tunnel CPU is hit hard.
04-12-2006 04:29 PM
So how much traffic are you hitting the router with when you see such high CPU ? And what sort of NPE card are you using ?
Paresh
04-12-2006 04:39 PM
NPE400 - I can cause high cpu by grabbing a 500Mb file (Over a 16Mb link).
If traffic is going "through" the routers, there is no CPU problems (So it appears as though it is being caused because the L2TPv3 tunnel terminates on the Routers (Loop Ints)
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