grblades
asked on
Cisco fast switching configured on interface but not working
We have a router which was working fine until we changed the BGP configuration at which point it has a few memory fragmentation errors and the CPU utilisation shot up.
We backed out the changes to the BGP and even removed one of the peers and gave it a reboot but the high CPU persists. I have compared the running config against a backup and it is identicaly apart from the BGP peer that was removed.
I have tracked down the high CPU to the IP Input process and found that IP fast switching is disabled although it is enabled in the configuration.
interface GigabitEthernet0/0/0
ip address xxx.xxx.170.202 255.255.255.248
no ip redirects
no ip proxy-arp
ip route-cache policy
negotiation auto
no cdp enable
no mop enabled
We backed out the changes to the BGP and even removed one of the peers and gave it a reboot but the high CPU persists. I have compared the running config against a backup and it is identicaly apart from the BGP peer that was removed.
I have tracked down the high CPU to the IP Input process and found that IP fast switching is disabled although it is enabled in the configuration.
interface GigabitEthernet0/0/0
ip address xxx.xxx.170.202 255.255.255.248
no ip redirects
no ip proxy-arp
ip route-cache policy
negotiation auto
no cdp enable
no mop enabled
#show ip int gi0/0/0
GigabitEthernet0/0/0 is up, line protocol is up
Internet address is xxx.xxx.170.202/29
Broadcast address is 255.255.255.255
Address determined by configuration file
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Multicast reserved groups joined: 224.0.0.5 224.0.0.6
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is disabled
Local Proxy ARP is disabled
Security level is default
Split horizon is enabled
ICMP redirects are never sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is disabled
IP fast switching on the same interface is disabled
IP Flow switching is disabled
IP CEF switching is disabled
IP Null turbo vector
IP multicast fast switching is enabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast, Policy
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
Input features: MCI Check
WCCP Redirect outbound is disabled
WCCP Redirect inbound is disabled
WCCP Redirect exclude is disabled
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Re-entered the command and the cpu has dropped back down.
Thanks