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CCNA 3 v3.0 Module 9 VLAN Trunking Protocol

CCNA 3 v3.0 Module 9 VLAN Trunking Protocol. Cisco Networking Academy. Objectives. Trunking VTP Inter-VLAN routing. Trunking Concepts. Trunking links between switches allow for the sharing of VLAN information. Frame Filtering. Frame Tagging. VLANs and Trunking. “Multi-colored link”.

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CCNA 3 v3.0 Module 9 VLAN Trunking Protocol

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  1. CCNA 3 v3.0 Module 9VLAN Trunking Protocol Cisco Networking Academy

  2. Objectives • Trunking • VTP • Inter-VLAN routing

  3. Trunking Concepts Trunking links between switches allow for the sharing of VLAN information.

  4. Frame Filtering

  5. Frame Tagging

  6. VLANs and Trunking “Multi-colored link”

  7. Inter-Switch Link Protocol – Cisco

  8. Frame Tagging and Encapsulation Methods IEEE Cisco

  9. VLAN Trunking Protocol (VTP) The role of VTP is to maintain VLAN configuration consistency across a common network administration domain.

  10. VTP Mode Comparison A transparent switch will not modify its database when updates are received, nor will the switch send out an update indicating a change in its VLAN status. Except for forwarding VTP advertisements, VTP is disabled on a transparent switch.

  11. VTP Operation

  12. VTP Implementation • There are two types of VTP advertisements: • Requests from clients that want information at bootup • Responses from servers • There are three types of VTP messages: • Advertisement requests • Summary advertisements • Subset advertisements

  13. VTP and Trunk Links • VTP messages are encapsulated in either ISL or IEEE 802.1Q protocol frames, and passed across trunk links to other devices.

  14. VTP Basic Configuration Steps • Determine the version number • Choose the domain • Choose the VTP mode • Server or Client or Transparent • Default is Server • Password protect the domain

  15. VTP Server vs. VTP Client • VLANs can only be created or deleted on a VTP Server switch. • VTP Client switches cannot create or delete VLANs. • However, VTP Clients can update VTP Servers if they have a higher revision number • Transparent Switches can add and delete VLANs but this information is not passed to the other switches in the VTP Domain.

  16. Inter-VLAN Routing

  17. Inter-VLAN Issues and Solutions Two of the most common issues that arise in a multiple-VLAN environment are as follows: • The need for end-user devices to reach nonlocal hosts • The need for hosts on different VLANs to communicate

  18. “Router-on-a-Stick” I’m like a lollipop!

  19. Physical and Logical Interfaces IEEE 802.1q is more common

  20. Dividing Physical Interfaces into Subinterfaces

  21. Configuring Inter-VLAN Routing

  22. If "native" command is NOT supported: interface Fastethernet0/0 description Dot1q Trunk to Switch-2950 ip address 10.1.1.1 255.255.255.0 speed 100 full-duplex ! interface Fastethernet0/0.10 encapsulation dot1q 10 ip address 10.1.10.1 255.255.255.0 ! interface Fastethernet0/0.20 encapsulation dot1q 20 ip address 10.1.20.1 255.255.255.0 If "native" command IS supported: interface Fastethernet0/0 description Dot1q Trunk to Switch-2950 no ip address speed 100 full-duplex ! interface Fastethernet0/0.1 encapsulation dot1q 1 native ip address 10.1.1.1 255.255.255.0 ! interface Fastethernet0/0.10 encapsulation dot1q 10 ip address 10.1.10.1 255.255.255.0 ! interface Fastethernet0/0.20 encapsulation dot1q 20 ip address 10.1.20.1 255.255.255.0 Two Options for Inter-VLAN Routing

  23. The ‘native’ Command • The ‘encapsulation dot1Q 1 native’ command was added in Cisco IOS version 12.1(3)T. • If you are using an earlier version of Cisco IOS, refer to the 802.1Q configuration on the previous slide. • The minimum IOS release required to support 802.1Q trunking on a 2620 or 2621 router is 12.0(1)T. • The native VLAN is used for untagged traffic when the port is in 802.1Q trunking mode. • While configuring 802.1Q trunking, it is very important to keep in mind that the native VLAN must be configured the same on each side of the trunk link.

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