Ethernet

GVRP stands for GARP VLAN Registration Protocol and is a GARP application that registers and deregisters VLAN attributes. It uses Generic Attribute Registration Protocol (GARP), to maintain and propagate dynamic VLAN registration information, throughout GVRP enabled devices on the network.

GVRP lets a device to propagate local VLAN registration information to other participant devices, and to dynamically update the VLAN registration information from other devices to its local database, including active VLAN members and through which port they can be reached. All GVRP participants on a bridged LAN maintain the same VLAN registration information. The VLAN registration information includes both manually configured local static entries and dynamic entries from other devices.

There are 3 different registration modes:

1. Normal – allows dynamic VLAN registration and deregistration on the trunk port, and allows the declarations for dynamic and static VLANs to be sent.
2. Fixed – prevents dynamic VLAN registration and deregistration on the trunk port, and allows only the declarations for static VLANs to be sent.
3. Forbidden – prevents dynamic VLAN registration and deregistration on the trunk port, and allows only the declarations for VLAN 1 to be sent.

Link aggregation, in other words trunking, is a technique that helps to increase bandwidth by bundling multiple physical interfaces into a logical one, named Eth-trunk. Besides bandwidth increase, trunking lets us to implement load-balancing and ensure higher reliability.

Few restrictions must be taken into consideration when creating Eth-trunk interface:

• parameters of physical interfaces (number, transmission rate, duplex mode and traffic-control mode) on both ends of the trunk link must be consistent.
• data sequence must be unchanged (frames belonging to the same data flow are transmitted over the same physical link).

Eth-Trunk interfaces configured on S5700 switch support the following features:

• Layer 2 forwarding and Layer 3 forwarding (unicast and multicast).
• Hash algorithm-based load balancing.
• QoS on the trunk interface.

There are 2 methods of link aggregation:

• manual load balancing mode

Today I want to show you:

• How to configure VLANs
• How to add interface to a VLAN
• How to establish 802.1q trunk between two Ethernet switches and filter VLANs
• How to configure VLANIF (VLAN interface or simply SVI).

Look at the following topology:

Let’s assume that we want to configure two switches, which are connected via Ethernet link. Both switches have PCs connected to them. We want to allow PC101 to be able to reach PC102 and PC201 to be able to reach PC202.To do so, we need to add two different VLANs, configure Ethernet Trunk between switches and add PCs to the correct VLAN.