Configuration Guide Interface Configuration
Untagged packets are ordinary Ethernet packets that can be
recognized by the network cards in PCs for communication.
Tagging refers to append four bytes of VLAN information,
namely the VLAN tag header, at the end of the source MAC
address and the destination MAC address.
Hybrid port
A hybrid port can belong to multiple VLANs that receives and sends packets of multiple VLANs.
It can be used to connect devices or computers. The difference between the hybrid port and
the trunk port is that the hybrid port sends the untagged frames of multiple VLANs, but the
trunk port sends only the untagged frames of the default VLAN. Note that the VLAN that a
hybrid port is going to join must already exist.
L2 Aggregate Port
An aggregate port consists of several physical ports. Multiple physical connections can be
bound into a simple logical connection, which is called an aggregate port (hereinafter referred
to as AP).
For layer 2 switching, an AP works like a switch port of high brandwidth. It increases link
bandwidth by using the bandwidth of multiple ports together. In addition, the frames that pass
through the L2 aggregate port will undergo traffic balancing on the member ports of the L2
aggregate port. If one member link of AP fails, the L2 aggregate port automatically transfers the
traffic on this link to other working member links, making the connection more reliable.
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.
L3 Interfaces
This section discusses the types and definitions of L3 interfaces. L3 interfaces fall into the
following categories.
SVI (Switch virtual interface)
Routed Port
L3 Aggregate Ports
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.
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