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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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6-5. GVRP

  • Generic Attribute Registration Protocol (GARP) VLAN Registration Protocol (GVRP) is an application defined in the IEEE 802.1Q standard that allows for the control of VLANs.

  • GVRP runs only on 802.1Q trunk links.

  • GVRP prunes trunk links so that only active VLANs will be sent across trunk connections.

  • GVRP expects to hear join messages from the switches before it will add a VLAN to the trunk.

  • GVRP updates and hold timers can be altered.

  • GVRP ports run in various modes to control how they will prune VLANs.

  • GVRP can be configured to dynamically add and manage VLANS to the VLAN database for trunking purposes.

Configuring GVRP

GVRP is supported only on COS switches. GVRP will run only on 802.1Q trunk ports and is used primarily to prune traffic ...

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