Networking Knowledge Base

Core issueThe %CPU_MONITOR-6-NOT_HEARD: CPU monitor messages have not been heard for [dec] seconds is displayed when heart beat Inter Process communication (IPC) messages do not exchange between the Route Processor (RP) or MSFC and Switch Processor (...

ResolutionTo collect CPU utilization on Cisco IOS  Software devices using Simple Network Management Protocol (SNMP), refer to How to Collect CPU utilization on Cisco IOS Devices Using SNMP.    For an example of collecting CPU utilization, refer to th...

ResolutionTo resolve this issue, perform these steps: On the switch, issue the show port command to verify these options:    Port status is connected.        No physical layer errors (Align-Err or FCS-Err) are occurring.        Duplex and speed setti...

ResolutionFor information about the IP pools and Digital Subscriber Line (DSL) switches, refer to CISCO-DSL-PROVISION-MIB. To monitor free addresses and addresses in use, refer to the cdslLocalIpAddrPoolTable table.Refer to this example:nms_server# s...

Core issueNetwork Interface Card (NIC) driver or misconfiguration of duplex/speed settings cause autonegotiation to fail.ResolutionEnsure that autonegotiation is configured on both ends of the link. On the switch, issue the show port command to disp...

Core IssueThe Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) architecture provides the service providers with a peer-to-peer model, which combines the best features of overlay and peer-to-peer models.  MPLS VPN technology enables ...

Core issueThis issue is documented in Cisco bug ID CSCec56677. It occurs when the write memory command is issued.The root cause of this bug is Cisco bug ID CSCeb45692.This bug indicates that whenever the write memory command is issued, a small amount...

Core issueThe 7600-SIP-400 linecard can drop packets due to parity errors that result from certain bit patterns. These parity errors are reported in the Bonham parity error counter, which can be monitored through the Command Line Interface (CLI) with...

ResolutionThe Multilayer Switch Feature Card (MSFC) may crash with a bus error exception, which might be caused by a software or hardware problem. These error messages may be displayed:On the console:      *** System received a Bus Error exception *...

Core issueThis issue can be due to a bug in Cisco IOS  12.2(18)SXF2, or due to the reception of IOS IP Service Level Agreement (SLA) SNMP requests (OID=1.3.6.1.4.1.9.9.42).This issue is documented in Cisco bug ID CSCsd36155.ResolutionThis issue is fi...

Core IssueThe issue is caused by the area parameters not matching.ResolutionThis message is usually accompanied with other messages, as follows: 00:20:21: OSPF: Rcv hello from x.x.x.x area 0.0.0.51 from FastEthernet0/0 x.x.x.x 00:20:21: OSPF: Hello...

SolutionEtherChannel can be configured manually with the appropriate commands, or it can be configured automatically if the switch negotiates the channel with the other side using Port Aggregation Protocol (PAgP). It is best to use the PAgP desirable...

SolutionA port configured to capture VACL-filtered traffic is called a capture port. Additionally, VLAN Access-List (VACL) capture can overcome the SPAN limitation where you can have only two span sessions.If you want to capture the traffic from one ...

ResolutionTo add an Authentication, Authorization and Accounting (AAA) server to Wireless LAN Solution Engine (WLSE), perform these steps:Select Devices > Discover > AAA Server.Enter this data:Show list: Select server type from the pulldown list:  Ex...

Core IssueThese are some of the reasons these issues occur:Clocking problems Faulty cabling  A TELCO line is down. Keepalives are not sent by a remote router.  Noisy line ResolutionFor a workaround, perform these steps:Issue the Router # sh interface...