Configuration Guide Interface Configuration
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.
Routed Port
A routed port is a physical port, for example, a port on the layer 3 device. It can be configured
by using a layer 3 routing protocol. On the layer 3 device, a single physical port can be set as a
routed port that serves as the gateway interface for layer 3 switching. A routed port serves as
an access port that is not related to a specific VLAN. A routed port provides no L2 switching
function. You may change an L2 switch port into a routed port by using the no switchport
command and then assign an IP address to it for routing purposes. Note that using the no
switchport command in the interface configuration mode will close and restart this port and
delete all the layer 2 features of this port.
However, when a port is a member port of an L2 aggregate port
or an unauthenticated DOT1x authentication port, the
switchport /no switchport command will not work.
L3 Aggregate Port
Just like a L2 aggregate port, a L3 aggregate port is a logically aggregated port group that
consists of multiple physical ports. The aggregated ports must be layer 3 ports of the same
type. For layer 3 switching, an AP that serves as the gateway interface for layer 3 switching
considers multiple physical links in the same aggregate group as one logical link. This is an
important method for expanding link bandwidth. In addition, the frames that pass through the
L3 aggregate port will undergo traffic balancing on the member ports of the L3 aggregate port.
If one member link of AP fails, the L3 aggregate port automatically assigns the traffic on this
link to other working member links, making the connection more reliable.
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