Networking Knowledge Base

Core IssueThe controller NM-xCE1T1-PRI will not be detected and cannot be configured until you use the "card type" command. Customer can not configure "controller T1 before using card type command.ResolutionAfter insert the NM-xCE1T1-PRI feature netw...

Core issueThe show etherchannel detail command displays this output for all ports that are part of the EtherChannel:switch#show etherchannel detailChannel-group listing:-----------------------Group: 1----------Group state = L2Ports: 2 Maxports = 8Por...

ResolutionMultilayer Switch Feature Card 2 (MSFC2) contains Error Correction Code (ECC) memory protection. However, there are memory locations where parity is checked, but single bit errors cannot be corrected. The following are some of the error mes...

ResolutionMasks are used with IP addresses in IP Access Control Lists (ACLs) to specify what should be permitted and denied.Masks to configure IP addresses on interfaces start with 255 and have the large values on the left side (for example, IP addre...

Core issueAfter an upgrade to an affected release of Catalyst Operating System (CatOS) software, the system can encounter an exception. The output of the show log command displays this message:Error Msg: mfree 2: m=0x8c994080PID = 0 Kernel anFor more...

Core IssueYour software may not support Open Shortest Path First (OSPF).ResolutionIf you are using a Cisco 1600 Series Router, you need a Plus image to run OSPF. Determine if you are running the appropriate Cisco IOS  Software feature set to configur...

Core IssueOnline Insertion and Removal (OIR) of network modules is not supported on Cisco 3620 and 3640 series routers. A drop in output voltage from the power supply is reported as an OIR event. Such events on the Cisco 3620 and 3640 series typicall...

Core issueThis message can indicate a transient ASIC packet buffer problem. The first [dec] is the module number. The second [dec] is the ASIC number.ResolutionIn order to run a complete diagnostic test on the module numbers mentioned in the error me...

Core issueThe configuration register boot field determines whether the switch loads an  operating system image, as well as where it obtains this system image. Note: The factory default configuration register setting for systems and spares is 0x0102.R...

Core issueThe issue is due to hardware limitations. It is not possible to enter more than 75 Access Control Entries (ACEs) in the first eight ports.When applying ACLs to physical interfaces, follow these configuration guidelines:Only one ACL with the...

Core IssueOSPF is an interior gateway, link state routing protocol that exchanges link state updates with other routers in the network. The link state information exchanged with the neighbors is used to populate the topology database. All routers wit...

Core IssueSegmentation Violation (SegV) exceptions are always software problems. These issues may lead to a SegV exception:Access to an invalid memory addressWrite access to a read-only memory regionA jump to an invalid PC (often 0x0)  If you do not ...

Core issueIn this case, Cisco Express Forwarding (CEF) is disabled due to a low memory condition. If the ip cef [distributed] command is configured, CEF can be re-enabled.Cisco recommends the reduction of other system activity in order to ease memory...

Core issueA routed port is a physical port that acts like a port on a router. It does not have to be connected to a router. A routed port is not associated with a particular VLAN, as is an access port. A routed port behaves like a regular router inte...

Core issueWhen the interface Command-Line Interface (CLI) wrr-queue queue-limit command is issued on a Cisco Catalyst 3550 switch with high traffic, certain queue-limit values can cause the switch to reset. This can happen when there is a high rate ...