Networking Knowledge Base

ResolutionXENPAK is a transceiver that provides 10-Gigabit Ethernet connectivity on the Cisco Catalyst WS-C3750G-16TD switches. XENPAK modules are only supported on the Cisco Catalyst 3750G-16TD switches.These are the XENPAKs that are supported on th...

Core IssueThe Catalyst 6500/6000 series switches use the Policy Feature Card (PFC) on the supervisor engines to switch Layer 3 (L3) traffic in hardware, when combined with a Multilayer Switch Feature Card (MSFC) which programs the PFC. The PFC also p...

Core issueThe syntax of this error message is:%SYS-3-PORT_IN_ERRORS: Port [dec]/[dec] detected [dec] input error(s) in last 30 minutes This message indicates that a port has experienced an input packet error. [dec]/[dec] is the module number and port...

Core IssueThe %OSPF-4-ERRRCV error message indicates that an Open Shortest Path First (OSPF) router has received an invalid OSPF packet. The cause of the error is included in the error message itself.Possible causes consist of the following:Mismatche...

ResolutionIt is possible to copy files to the flash devices of the standby supervisors with the 2/slot0: or 2/bootflash: command options in order to load a new image on the standby supervisor engine that is different from the image on the active supe...

Core issueThe reason for this could be that you used archive download-sw /leave-old-sw in the download option. The /leave-old-sw option keeps the old software version after a download. When you enter reload, this only reloads the active switch. This ...

Core IssueThere are various ways to configure a default gateway on a router. A default gateway is also known as a default route or gateway of last resort.ResolutionTo configure a default gateway on a Cisco router, issue these commands: ip default-gat...

Core issueWhen this issue occurs, the port LED does not light up. The status of the interface is down/down.ResolutionTo fix this issue, try these steps:Set the speed and duplex to AUTO. Enable the Auto-Medium-dependent Interface Crossover (MDIX) feat...

ResolutionIn Cisco Catalyst 4000/4500 Series switches, the software running on the Supervisor(Sup) cannot be converted from CatOS to Cisco IOS , nor can the reverse action be performed.The software supported on Cisco Catalyst 4000 Series switches dep...

ResolutionIP routing is enabled by default. However, IP routing does not work if what must be routed is not configured on the switch. This is because the switch has a built-in router.IP routing cannot be disabled on the Supervisor 720 (Sup 720). Howe...

ResolutionCisco NAM-1 and NAM-2 share the same hardware architecture and software applications, but are different in these respects:NAM-2 has an additional accelerator card that provides extra-high packet-processing performance for full-scale gigabit...

Core issueThese error messages appear in the logs:%KERNEL-1-CREATEPROCESSFAILED:Error in creating process: Unavailable free stack; stack type: 2; Name: tnetproc%MGMT-2-SESSION_FAIL:Out of telnet processes.  Try later.The %KERNEL-1-CREATEPROCESSFAILED...

Core IssueRoute redistribution is used to propagate routes that are statically configured or learned through one routing protocol into another routing protocol. However, at times, the static routes might not get redistributed into various protocols o...

Core issueA Cisco Catalyst 6500 switch with Supervisor 2 engine (Sup2) that runs Catalyst Operating System (CatOS) 7.4(3) can crash with the PID SptTimer process.The PID refers to the Process Identification number and SptTimer is the process that con...

Core issueThe SYS-2-FAN_FAIL message indicates the chassis fan failed.ResolutionRe-seat the fan tray. If this does not resolve the issue, replace the fan tray.To determine if the part is in the affected products list, refer to Field Notice: Catalyst ...