Accton Technology ES4710BD manual L3 Forward Configuration, Create Layer 3 Interface

ES4710BD 10 Slots L2/L3/L4 Chassis Switch

Chapter 17 L3 Forward Configuration

ES4710BD supports Layer 3 forwarding which forwards Layer 3 protocol packets (IP packets) across VLANs. Such forwarding uses IP addresses, when a port receives a IP packet, it will index it in its own route table and decide the operation according to the index result. If the IP packet is destined to another subnet reachable from this switch, then the packet will be forwarded from the appropriate port. ES4710BD can forward IP packets by hardware, the forwarding chip of ES4710BD has a host route table and default route table. Host route table stores host routes to connect to the switch directly; default route table stores segment routes (after aggregation algorithm process).

If the route (either host route or segment route) for forwarding unicast traffic exists in the forwarding chip, rather than processing by the CPU in router, the forwarding of traffic will be completely handled by hardware. As a result, forwarding speed can be greatly improved, even to line speed.

17.1Layer 3 Interface

17.1.1 Introduction to Layer 3 Interface

Layer 3 interface can be created on ES4710BD. Layer 3 interface is not physical interface but a virtual interface. Layer 3 interface is built on VLANs. The Layer 3 interface can contain one or more layer2 interfaces of the same VLAN, or no layer2 interfaces. At least one of the Layer2 interfaces contained in Layer 3 interface should be in a UP state for Layer 3 interface in the UP state, otherwise, Layer 3 interface will be in the DOWN state. All layer 3 interfaces in the switch use the same MAC address, this address is selected from the reserved MAC address in creating Layer 3 interface. The Layer 3 interface is the base for layer 3 protocols. The switch can use the IP addresses set in the layer 3 interface to communicate with the other devices via IP. The switch can forward IP packets between different Layer 3 interfaces.

17.1.2 Layer 3 interface configuration

17.1.2.1Layer 3 Interface Configuration Task Sequence

1. Create Layer 3 Interface

Command

Explanation

Global Mode
interface vlan <vlan-id>		Creates a VLAN interface (VLAN interface is a
no interface vlan <vlan-id>		Layer 3 interface); the “no interface vlan
	368