Network Access Fix ~5 min · multi-device

A VLAN won't cross the trunk

SW1 and SW2 are connected by a trunk on Gi0/1. VLAN 10 hosts work across it; VLAN 20 hosts on SW1 can't reach VLAN 20 hosts on SW2. VLAN 20 is defined and active on both sides. Investigate the trunk on SW1 and restore VLAN 20 connectivity.

Objective

○SW1 Gi0/1 trunk allows VLAN 20

Hints

Hint — the fix

enable
configure terminal
 interface gi0/1
  switchport trunk allowed vlan add 20
  end
show interfaces trunk