Disabling Dynamic Trunking Protocol (DTP)

Disabling Dynamic Trunking Protocol (DTP) networkingguruji1.com/2019/12/disabling-dynamic-trunking-protocol-dtp.html

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Previous post: - Inter-Switch Link all information discussion, click here And 802.1q trunking configuration, click here

Disabling DTP Negotiation 1.

Disable dynamic trunking protocol on the trunk link on SW-1

2. Verify that trunking is still occurring between SW-1 and SW-2, SW-1 and SW-3 without the use of DTP

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“Disable DTP on Cisco switches configuration” SW-1 SW-1(config)#interface fastethernet 0/1 SW-1(config-if)#switchport trunk encapsulation dot1q SW-1(config-if)#switchport nonegotiate SW-1(config)#interface fastethernet 0/2 SW-1(config-if)# switchport trunk encapsulation dot1q SW-1(config-if)#switchport nonegotiate Verification & Explanation “Cisco DTP (Dynamic Trunking Protocol) Negotiation” DTP negotiation can disable two ways, with switchport mode access command or with switchport nonegotiate command. If trunking is needed, but DTP is disabled, it must be statically configured with switchport mode trunk command. This design is most commonly used when switching trunking to a device that does not support DTP, such as an IOS router routed Ethernet interface or server’s connected NIC card.

SW-1# show interface FastEthernet 0/1 switchport 2/5

Name: Fa0/1 Switchport: Enabled Administrative Mode: trunk Operation mode: trunk Administrative trunking encapsulation: dot1q Operation trunking encapsulation: dot1q Negotiation of trunking: off <<Trunking negotiation is off>> Access mode VLAN: 1 (default) Trunking Native mode VLAN: 1 (default) Voice VLAN: none Administrative private-VLAN host-association: none Administrative private-VLAN mapping: none Administrative private-VLAN trunk native VLAN: none Administrative private-VLAN trunk encapsulation: dot1q Administrative private-VLAN trunk normal VLANs: none Administrative private-VLAN trunk private VLANs: none Operational private-VLAN: none Trunking VLANs Enabled: All Pruning VLANs Enabled: 2-1001 Capture Mode Disable Capture VLANs Allowed: All Protected: False Application Trust: none SW-1#show interface trunk Port Fa0/1 Fa0/2 Port Fa0/1 Fa0/2

Mode on on

Encapsulation 802.1q 802.1q

Status

Native vlan

trunking trunking

1 1

Vlans allowed on trunk 1-1005 1-1005

Port Fa0/1 Fa0/2

VLANs allowed and active in management domain 1 1

Port

VLAN in spanning tree forwarding state and not pruned 3/5

Fa0/1 Fa0/2

1 1

SW-2#show interface trunk Port Fa0/2 Port Fa0/2

Mode on

Encapsulation 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 Fa0/2

VLAN in spanning tree forwarding state and not pruned 1

SW-3#show interface trunk Port Fa0/1 Port

Mode on

Encapsulation 802.1q

Status trunking

Native VLAN 1

Vlans allowed on trunk 4/5

Fa0/1

1-1005

Port Fa0/1

VLANs allowed and active in management domain 1

Port Fa0/1

VLAN in spanning tree forwarding state and not pruned 1

Cisco Dynamic Trunking Protocol Modes DTP, click here

And, Configuring L2 Access Switch port, click here

This is a full article "Disabling Dynamic Trunking Protocol (DTP)â&#x20AC;? Thank you so much.

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