SVIs (Switch Virtual Interfaces) are logical VLAN interfaces that enable a Layer 3 switch to route between VLANs and provide management access. Master SVI creation, IP routing enablement, and troubleshooting SVI states.
show interface status tells you more than up/down. Here are five tips for reading it quickly: port status, VLAN, speed/duplex, errdisable, and description use.
Factory resetting a Cisco switch means clearing the config, VLAN database, and sometimes the boot variable. Here are the safe methods and pre-reset prep.
Checking CDP neighbors on a Cisco ASA is a two-command job once CDP is enabled. Here is how to turn it on, read show cdp neighbors, and map your topology.
A Cisco switch gets its management IP on an SVI (usually VLAN 1 or a dedicated mgmt VLAN). Here is the config, the default gateway step, and SSH-readiness.
Get files onto a Cisco router with TFTP, SCP, or USB. Here is how to set up a TFTP server, use copy tftp: flash:, and avoid the common transfer gotchas.
Clear interface counters on a Cisco switch with clear counters to reset a baseline before troubleshooting. Here is how to use it safely and verify errors.
A thorough Cisco port audit hits port status, VLANs, port security, 802.1X, CDP/LLDP, STP role, errors, and unused-port shutdowns. Here are ten repeatable steps.
Enabling HTTP or HTTPS on a Cisco switch takes ip http server, secure-server, AAA, and a trustpoint. Here is the config, the security hardening, and the gotchas.
Check a Cisco switch warranty by grabbing the serial from the chassis or show inventory, then running it through the Cisco Serial Number Info Finder.
EtherChannel presents multiple physical links as a single logical interface to the spanning tree algorithm, eliminating blocked ports and enabling true line-rate redundancy.
Deep dive into VLAN naming conventions, the difference between standard and extended range VLANs, and best practices for VLAN management and deletion on Cisco Catalyst switches.