Troubleshooting Inter-VLAN Routing: SVIs, Router-on-a-Stick, and ARP Issues
Inter-VLAN routing failures are usually caused by SVIs in down state, missing routes, DHCP misconfiguration, or ARP timeouts. Learn to diagnose and fix them systematically.
Troubleshooting
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Troubleshooting VLAN and Trunk Problems on Cisco Switches
Most VLAN outages stem from ports in the wrong VLAN, trunks not allowing required VLAN, or native VLAN mismatches. Here's how to diagnose and fix them systematically.
Troubleshooting SVI Up/Down Issues on Cisco Catalyst Switches
An SVI stuck in up/down means something is wrong with the underlying VLAN — no active ports, a deleted VLAN, or STP blocking every path. Here is how to diagnose and fix every cause.