Chapter 5: VLAN Trunks and
EtherChannel Bundles
Instructor Materials
CCNP Enterprise: Core Networking
,Chapter 5 Content
This chapter covers the following content:
• VLAN Trunking Protocol (VTP) - This section provides an overview of how switches
become aware of other switches and prevent forwarding loops.
• Dynamic Trunking Protocol (DTP) - This section examines the improvements made to
STP for faster convergence.
• EtherChannel Bundle -This section explains how multiple physical interfaces can be
combined to form a logical interface to increase throughput and provide seamless
resiliency.
© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 2
,VLAN Trunking Protocol
• Cisco created the proprietary protocol, VLAN Trunking Protocol (VTP), to
reduce the burden of provisioning VLANs on switches.
• Switches that participate in the same VTP domain can have a VLAN created
once on a VTP server and propagated to other VTP client switches in the
same VTP domain.
© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 3
, VLAN Trunking Protocol
The Roles of VTP
There are four roles in the VTP architecture:
VTP Roll Description
Server The server switch is responsible for the creation, modification, and deletion of
VLANs within the VTP domain.
Client The client switch receives VTP advertisements and modifies the VLANs on
that switch. VLANs cannot be configured locally on a VTP client.
Transparent VTP transparent switches receive and forward VTP advertisements but
do not modify the local VLAN database. VLANs are configured only locally.
Off A switch does not participate in VTP advertisements and does not forward
them out of any ports either. VLANs are configured only locally.
© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 4
EtherChannel Bundles
Instructor Materials
CCNP Enterprise: Core Networking
,Chapter 5 Content
This chapter covers the following content:
• VLAN Trunking Protocol (VTP) - This section provides an overview of how switches
become aware of other switches and prevent forwarding loops.
• Dynamic Trunking Protocol (DTP) - This section examines the improvements made to
STP for faster convergence.
• EtherChannel Bundle -This section explains how multiple physical interfaces can be
combined to form a logical interface to increase throughput and provide seamless
resiliency.
© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 2
,VLAN Trunking Protocol
• Cisco created the proprietary protocol, VLAN Trunking Protocol (VTP), to
reduce the burden of provisioning VLANs on switches.
• Switches that participate in the same VTP domain can have a VLAN created
once on a VTP server and propagated to other VTP client switches in the
same VTP domain.
© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 3
, VLAN Trunking Protocol
The Roles of VTP
There are four roles in the VTP architecture:
VTP Roll Description
Server The server switch is responsible for the creation, modification, and deletion of
VLANs within the VTP domain.
Client The client switch receives VTP advertisements and modifies the VLANs on
that switch. VLANs cannot be configured locally on a VTP client.
Transparent VTP transparent switches receive and forward VTP advertisements but
do not modify the local VLAN database. VLANs are configured only locally.
Off A switch does not participate in VTP advertisements and does not forward
them out of any ports either. VLANs are configured only locally.
© 2016 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 4
