802.1q Trunking Configuration Cisco Catalyst Switches networkingguruji1.com/2019/12/802.1q-trunking-configuration-cisco-catalyst-switch.html
My Dear Friend in today’s article, I will tell you “802.1q trunking configuration cisco catalyst switches” If you any problem after reading this article, you can see the video below. Please don't forget to Like, Share, Comment & Subscribe to our Networking Guruji Channel for more video. Cisco switch uses two encapsulations on the trunk port. ---- ISL (Inter-Switch Link) ---- Dot1q/802.1q Previous post: - Inter-Switch Link all information discussion, Click here Today discussion only 802.1q trunking
802.1Q Encapsulation Explained
It is an IEEE Standard. 802.1q supports 4096 Vlans. IN 802.1q encapsulation process, a 4-byte tag is inserted into the original frame and FCS (Frame Check Sequence) is re-calculated. 802.1q does not tag native VLANs.
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802.1 q trunking configuration SW-1 sw-1(config)#interface fastethernet 0/1 sw-1(config-if)#switchport trunk encapsulation do1/q sw-1(config-if)#switchport mode trunk sw-1(config)interface fastethernet 0/2 sw-1(config-if)# switchport trunk encapsulation do1/q sw-1(config-if)#switchport mode trunk
SW-1#Show interface trunk
Port Fa0/1 Fa0/2 Port Fa0/1 Fa0/2 Port
Mode desirable desirable
Encapsulation 802.1q 802.1q
Status trunking trunking
Native vlan 1 1
Vlans allowed on trunk 1-1005 1-1005 VLANs allowed and active in management domain 2/5
Fa0/1 Fa0/2 Port Fa0/1 Fa0/2
1 1 VLAN in spanning tree forwarding state and not pruned 1 1
Now, SW-2 and SW-3 must agree to use dot1q trunking as seen in the following output, for negotiated dot1q.
SW-2#Show interface trunk
Port Fa0/2 Port Fa0/2 Port Fa0/2
Mode auto
Encapsulation n-802.1q
Status trunking
Native VLAN 1
Vlans allowed on trunk 1-1005 VLAN allowed and active in management domain 1
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Port Fa0/1
VLAN in spanning tree forwarding state and not pruned 1
SW-3#Show interface trunk Port Fa0/2 Port Fa0/2
Mode auto
Encapsulation n-802.1q
Status trunking
Native VLAN 1
Vlans allowed on trunk 1-1005
Port Fa0/2
VLANs allowed and active in management domain 1
Port Fa0/1
VLAN in spanning tree forwarding state and not pruned 1
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