Networking Knowledge Base

Core IssueFor a Cisco 7200 series router or Cisco 7200 VXR router that has an NPE-225,  NPE-200, NPE-175, NPE-150, or NPE-100 installed, one or more of these error messages may be displayed when the bandwidth points exceed the system  limit:    %C72...

ResolutionThe Power Inline Consumption feature on the Cisco Catalyst 3560 and 3750 Series Power over Ethernet (PoE) products allows the network administrator to configure the actual power requirements of the powered device (PD). This feature allows t...

ResolutionA secure port has a default of one MAC address. The default can be changed to any value between 1 and 3,000. The upper limit of 3,000 guarantees one MAC address per port and an additional 3,000 across all ports in the system.In Cisco Cataly...

Core issueWhen you configure the port-security aging time with the switchport port-security aging time command, the valid range is from zero to 1440 minutes and when the time is equal to 0, aging is disabled for this port.But in the switch CLI, this ...

Core Issue:Resolution:Also See: Core Issue:These are among the issues:     Troubleshooting OSPF Neighbor States    Troubleshooting the OSPF Routing Table    Troubleshooting OSPF Init State    Troubleshooting OSPF MTU    Troubleshooting OSPF Corrupt P...

Core issueThe interprocess communication (IPC) errors generally indicate that both supervisors run different Cisco IOS software releases or have incorrect boot variable information. This does not always cause operational failure. In some scenarios, t...

Core issueMalformed packets cause Cisco Catalyst OS (CatOS) 7.x code to display %SYS-4-SUPERVISOR_ERR:Forwarding engine IP errors. These error message counters are recorded in the syslog:%SYS-4-SUPERVISOR_ERR:Forwarding engine IP length error counter...

Core IssueA software-forced crash occurs when the router detects a severe, unrecoverable error and reloads itself to prevent the sending of corrupted data. A vast majority of software-forced crashes are caused by Cisco IOS  Software bugs, although so...

Core issueThe error message looks similar to this:%PFREDUN-4-PHYSMEM_MISMATCH: Asymmetrical redundant configuration: Active [chars] has ([int]/[int]K) memory, Standby has ([int]/[int]K)%PFREDUN-SP-4-PHYSMEM_MISMATCH: Asymmetrical redundant configurat...

Core issueConfiguration information resides in these two places when the Multilayer Switch Feature Card (MSFC) operates:The default (permanent) configuration in Non-Volatile RAM (NVRAM) The running (temporary) memory in RAM The default configuration ...

Core IssueThe Policy Feature Card (PFC) extends the features and functionality of the Catalyst 6000 family of switches by providing a number of enhancements such as advanced Quality of Service (QoS) features and security capabilities. Cisco Express F...

ResolutionWhen the total amount of traffic aggregated from the source ports exceeds the physical limitations of the destination port, it results in some dropped packets on the destination port. This does not cause any switch performance degregation o...

Core issueThis issue occurs in a scenario where two Cisco Catalyst switches in two different VTP domains are connected together via a cross-over cable and you see a link light, but no traffic passes at the Layer 2 level between the switches.A trunk l...

Core issueThis issue causes the Supervisor Engine to go to ROM Monitor (ROMmon) mode.ResolutionTo resolve this issue, perform these steps:Console into the Supervisor engine.     If the prompt is displayed as ROMmon, the Supervisor Engine is not able ...

Core issueThe Cisco Catalyst 2940, 2950, 2955, 2970, 3550 and 3750 switches are not accessible from a router for IP address configuration.ResolutionIf the switch cannot be accessed, the management VLAN interface (VLAN 1 is the default management VLAN...