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DES-7200 Configuration Guide Chapter 1 Interface Configuration
1-4
Caution
The member port of the L2 aggregate port can be either access
port or trunk port. However, the member ports in one AP must be
of the same type, namely, all the ports are either access ports or
trunk ports.
1.1.2 L3 Interfaces
This section discusses the types and definitions of L3 interfaces. L3 interfaces
fall into the following categories.
z SVI (Switch virtual interface)
z Routed Port
z L3 Aggregate Ports
1.1.2.1 SVI (Switch virtual interface)
SVI, short for Switch Virtual Interface, is used to implement the logical interface
for layer 3 switching. SVI can work as the local management interface through
which administrator can manage devices. You can also create SVI as a gateway
interface that serves as the virtual sub-interface of each VLAN. It can be used
for inter-VLAN routing on layer 3 device. A SVI can be created simply by using
the interface vlan command in the interface configuration mode. Then an IP
address is assigned to the SVI to establish a route between VLANs.
As the following figure depicts, the hosts of VLAN20 can communicate to each
other directly without routing through an L3 device. If host A in VLAN20 wants to
communicate with host B in VLAN30, it must route through SVI1 corresponding
to VLAN20 and SVI2 corresponding to VLAN30.