Networking Knowledge Base

Core issueThe Catalyst 4500/4948G that runs Cisco IOS Software Release 12.2(25)EWA7 shows these symptoms:ARP is not resolved for directly connected devices, which affects connectivity, and the routing protocols do not form adjacency due to this probl...

Core issueThis status is shown when the show wlccp wnm status command is issued on the Wireless Domain Services (WDS) Access Points.ResolutionThis status indicates that the Wireless LAN Solution Engine (WLSE) does not have the correct credentials for...

Core issueThis message indicates that during normal polling, the Supervisor Engine has detected a problem in the power management circuitry on one of the modules. The module is not be polled again after the failure is detected.These are the issues th...

Core IssueOrganizations use parallel links and load balance their network traffic over these multiple links. This makes higher bandwidth available to network users, in a scalable, cost-effective manner. Cisco Express Forwarding (CEF) is a Layer 3 (L3...

Core IssueHot Standby Router Protocol (HSRP) provides redundancy for IP networks to ensure that user traffic immediately and transparently recovers from first hop router failures. HSRP allows multiple routers on a single LAN to share a virtual IP and...

Core issueThe error message seems to be %SYS-3-SEM_HOLDMANY:Task [Chars] holds too many semaphoresThis message indicates that a task is holding too many semaphores. [chars] is the name of the task.The message is an indication that the EtherChannel pr...

Core issueCisco Network Assistant (CNA) only supports these features on the Catalyst 4500 Series Switches:Administration menu IP Address, Simple Network Management Protocol (SNMP),  System Time, HTTP Port, Users and Passwords, Console Baud Rate, MAC ...

Core issueMAC addresses learned from ports directly on the switch occasionally disappear from the cam table. This is recoverable when you do a clear mac-address-table dynamic vlan x command. The MAC address learned on this vlan x appear in table agai...

Core issueThe devices that are connected to a Catalyst 4000 or 4500 series switch can sometimes experience poor network connectivity. Some packets are dropped by the switch due to a faulty Static RAM (SRAM) component on the Supervisor Engine. Larger ...

Core IssueThe Route Switch Processor (RSP) has sent a command to an Interface Processor (IP) card in slot n, but the IP has failed to respond to the command within the expected time frame. The two types of command structures used in communication bet...

Core issueThe %SYS-3-CPUHOG: Task ran for [dec] msec ([dec]/[dec]), process = [chars], PC = [hex] message is received when a process runs for too long, and does not relinquish the processor. The process is a "CPU hog".Each process should run only for...

Core issueThe error message can look similar to this:TLB (Store) Exception ***Access address = 0x10000403 PC = 0x8000fd60, Cause = 0xc, Status Reg = 0x30419003monitor: command "boot" aborted due to exceptionThis error message can be observed during a...

Core issueThe Cisco Intelligent Gigabit Ethernet Switch Module (IGESM)is a Layer 2 switch. The four external ports are set for auto-sensing. The two ports to the BladeCenter MMs operate at 100 Mbps. There is a management port on the edge of the switc...

Core issueThis is used to analyze the packet drop in the queue. It is observed that the show policy-map interface counters do not increment on the Catalyst 3750 switch.  All counters shows 0.The show policy-map interface command is not supported on 3...

Core issueA ciscoEnvMonTemperatureNotification message is sent if the temperature measured at a given test point is outside the normal range for the test point (if it is at the warning, critical, or shutdown stage).If the status of the trap is only i...