802.1Q Trunking

802.1Q trunks carry multiple VLANs on one link by tagging each frame (12-bit VID); frames for the native VLAN stay untagged. A trunk with no allowed list passes every VLAN. interface Gi0/1 switchport mode trunk switchport trunk native vlan 99 switchport trunk allowed vlan 10,20,30 switchport nonegotiate ! silence DTP (security best practice) Mismatch failures […]