Networking Knowledge Base

Core issueThe WS-X4506-GB-T module is a six-port alternately-wired 10/100/1000BASE-T Cisco Catalyst 4500 series Power over Ethernet (PoE) 802.3af or 1000BASE-X SFP. When installed in a 4500 switch running CatOS, the show module command displays the m...

Core issueWhen the auto-upgrade process cannot find the appropriate stack member software to copy to the switch in voicemail (VM) mode, the auto-advise process tells you the command, which is the archive copy-sw or archive download-sw privileged EXEC...

ResolutionThe MEM-S1-128MB= memory upgrade kit consists of two 64-MB DRAM, Dual Inline Memory Modules (DIMMs). The memory upgrade kit upgrades the total Supervisor Engine memory from 64 MB (2 32-MB DIMMs) to 128 MB (2 64-MB DIMMs).Issue the show vers...

ResolutionIt is very important that the switches added to or removed from the switch stack are powered OFF. Issue the switch provision global configuration command on the stack master in order to provision or supply a configuration to the new switch ...

Core IssueThe %RSP-3-ERROR MD error message indicates a parity error has occurred. The accompanying messages indicate whether the bad parity is found on the Route Switch Processor (RSP) or on another card.ResolutionIf a Cisco 7500 series router produ...

Core issueError messages similar to these can appear in the logs:Aug 30 08:16:26.055: %FILESYS-SP-5-IFLASH: Internal Flash bootflash format is from a different router typeAug 30 08:16:26.055: %FILESYS-SP-5-IFLASH: Internal Flash bootflash reformat is...

Core IssueCertain multicast applications use progressive Time to Live (TTL) values to find where clients and servers are located. They choose a TTL value automatically so the multicast application traffic from the server can reach the farthest client...

Core IssueBorder Gateway Protocol (BGP) does not perform load balancing by default.ResolutionLoad sharing is a concept that allows a router to distribute the outgoing and incoming traffic among multiple paths. The paths are derived either statically ...

ResolutionTo change the logging timeout period for the Wireless LAN Solution Engine (WLSE) web interface, issue the webtimeout command. After the timeout expires, you will be logged out of the WLSE web interface. The default is 30 minutes (1800 secon...

Core issueMany performance issues with switches are related to data link errors. Excessive errors usually indicate a problem. When operating at half-duplex setting, some data link errors like Frame Check Sequence (FCS), alignment, runts and collision...

Core issueThe %VPN-SM-4-ICPUPP9 error occurs because IP Security (IPSec) packets fail the anti-replay check. The IPsec packets fails the anti replay checks because the packet does not fit into the 64-packet anti-replay window. A sliding window perfor...

Introduction:Configuration overview:1) Creation of a keychain and key:2) Configuration of RIP authentication under interface:Verification commandsRelated Information: Introduction:Routing protocols are used to exchange reachability information betwee...

Core issueThe %CSM_SLB-4-TOPOLOGY error message occurs if the Content Switching Module (CSM) detects a bridge loop in the network.The full error message looks similar to this: %CSM_SLB-4-TOPOLOGY: Module 6 warning: ARP frame from10.208.136.6 received...

ResolutionCheck inbound filters and modify them to permit the prefix.Valid Route to BGP Next HopValid route to next hop existsshow ip bgp {network mask}Prefix/network exists, learned by iBGP and marked as received onlyPrefix/network exists, learned b...

ResolutionTo back up the Wireless LAN Solution Engine (WLSE) using the Command-Line Interface (CLI), perform these steps:Log in to the console as an administrative user.To configure the backup FTP server, issue the backupconfig command. This is the c...