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Core issueThe Cisco Catalyst 4000 NetFlow Services Card (WS-F4531) is an optional daughter card for the Catalyst 4000/4500 Supervisor Engine IV or Supervisor Engine V. In Supervisor Engine V-10GE, the NetFlow functionality is embedded in the supervis...

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Core issueIf ports (2/1-4) forming an EtherChannel have inconsistent VLAN configuration, on the one side (A) set to AUTO mode, and the other side (B) is correctly configured but set to ON, Spanning-Tree Protocol (STP) errors can be generated during E...

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Core IssueThis issue may result in the new value not holding after the reload.ResolutionTo ensure that the configuration register value is set back to the default (after changing the console speed for an xmodem transfer), perform these steps:After th...

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Core IssueNetwork Address Translation (NAT) replaces IP addresses within a packet with different IP addresses. It is useful in the following instances:To conserve IP addressesTo connect a private network with an unregistered address to a public netwo...

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Core IssueA valid route must exist in the routing table for Border Gateway Protocol (BGP) to advertise a classful network by issuing the network configuration command (under router BGP).ResolutionTo resolve this issue, ensure that a valid route exist...

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Core issueThe show module command output shows the status as bypass because the diagnostic level is configured as bypass for some reason. ResolutionThe default diagnostic mode is minimal, whether the software is Catalyst OS (CatOS) or Cisco IOS . The...

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Core issueThis message indicates that a fault has been detected in an Ethernet port connection, and that the port has been disabled in order to prevent other protocols from malfunctioning:%UDLD-3-AGGRDISABLE: Neighbor(s) of port [dec]/[dec] disappear...

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ResolutionBorder Gateway Protocol (BGP) routers typically receive multiple paths to the same destination. The BGP best path algorithm decides which is the best path to install in the IP routing table and to use for forwarding traffic.For a list of ru...

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ResolutionLoopbacks are considered host routes in Open Shortest Path First (OSPF).  To make OSPF advertise the loopback subnet as the actual subnet with the loopback mask, instead of as host route /32, issue the ip ospf network point-to-point command...

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Core issueThe EXPRESS_SETUP-6-CONFIG_IS_RESET: [chars] error message means the configuration is reset. [chars] is a text message that clarifies the reset event.If you press the Mode button for a total of 10 seconds or more in a switch configured for ...

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Core IssueRouters that run Cisco IOS  Software from Flash have a feature called Flash Load Helper (FLH).  When this is present in both Cisco IOS Software and ROM, the Flash is set to Read Only.ResolutionBecause this is a cosmetic issue, it does not p...

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