How to Configure VLAN Trunks on CISCO Switch

Описание: How to Configure VLAN Trunks (IEEE 802.1Q) on Cisco Switches

TIMESTAMPS:
0:00 Introduction
1:15 Two Trunk Encapsulations
1:59 Layer 2 Interface Modes
5:00 Configuring a VLAN trunk
7:40 Verifying the trunk configurations
10:35 Conclusion

VLAN Trunks
Ethernet trunks carry the traffic of multiple VLANs over a single link.
Beneficial when switches are connected to other switches or routers trunk link is not assigned to a specific VLAN.
Dynamic Trunking Protocol (DTP) negotiates a common trunking mode between two switches.
Disable DTP negotiation if a switch has a trunk link connected to a non-trunking router or firewall interface.
A trunk link can be negotiated between two switches only if both switches belong to the same VLAN Trunking Protocol (VTP) management domain
Two Trunk Encapsulations:
isl: VLANs are tagged by encapsulating each frame using the Cisco ISL protocol.
no longer supported across all Cisco Catalyst switch platforms.
dot1q: VLANs are tagged in each frame using the IEEE 802.1Q standard protocol, except for the native VLAN.

Layer 2 Interface Modes
switchport mode access
switchport mode dynamic auto
switchport mode dynamic desirable
switchport mode trunk
switchport nonegotiate

Configuring a VLAN (IEEE 802.1Q) Trunk
SW1 and SW2:
conf t
interface g0/0
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
switchport trunk native vlan 100
switchport trunk allowed vlan 100-200
end
wr
!
Verifying the VLAN Trunk Configuration
show interfaces gi0/0 switchport
show interfaces gi0/0 trunk

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References:
https://www.cisco.com/c/en/us/td/docs...

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