Routed Ports; Switch Virtual Interfaces - Cisco WS-CBS3032-DEL Software Configuration Manual

Understanding Interface Types
tag (called the metro tag), containing a VLAN ID unique in the service-provider network, for each
customer. The double-tagged packets go through the service-provider network keeping the original
customer VLANs separate from those of other customers. At the outbound interface, also a tunnel port,
the metro tag is removed, and the original VLAN numbers from the customer network are retrieved.
Tunnel ports cannot be trunk ports or access ports and must belong to a VLAN unique to each customer.
For more information about tunnel ports, see
Protocol Tunneling."

Routed Ports

A routed port is a physical port that acts like a port on a router; it does not have to be connected to a
router. A routed port is not associated with a particular VLAN, as is an access port. A routed port behaves
like a regular router interface, except that it does not support VLAN subinterfaces. Routed ports can be
configured with a Layer 3 routing protocol. A routed port is a Layer 3 interface only and does not support
Layer 2 protocols, such as DTP and STP.
Configure routed ports by putting the interface into Layer 3 mode with the no switchport interface
configuration command. Then assign an IP address to the port, enable routing, and assign routing
protocol characteristics by using the ip routing and router protocol global configuration commands.
Entering a no switchport interface configuration command shuts down the interface and then re-enables
Note
it, which might generate messages on the device to which the interface is connected. When you put an
interface that is in Layer 2 mode into Layer 3 mode, the previous configuration information related to
the affected interface might be lost.
The number of routed ports that you can configure is not limited by software. However, the
interrelationship between this number and the number of other features being configured might impact
CPU performance because of hardware limitations. See the
page 11-25
For more information about IP unicast and multicast routing and routing protocols, see
"Configuring IP Unicast Routing"
The IP base feature set supports static routing and the Routing Information Protocol (RIP). For full
Note
Layer 3 routing or for fallback bridging, you must enable the IP services feature set on the standalone
switch, or the stack master.

Switch Virtual Interfaces

A switch virtual interface (SVI) represents a VLAN of switch ports as one interface to the routing or
bridging function in the system. Only one SVI can be associated with a VLAN, but you need to configure
an SVI for a VLAN only when you wish to route between VLANs, to fallback-bridge nonroutable
protocols between VLANs, or to provide IP host connectivity to the switch. By default, an SVI is created
for the default VLAN (VLAN 1) to permit remote switch administration. Additional SVIs must be
explicitly configured.
You cannot delete interface VLAN 1.
Note
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
11-4
for information about what happens when hardware resource limitations are reached.
and
Chapter 11
Chapter 17, "Configuring IEEE 802.1Q and Layer 2
"Configuring Layer 3 Interfaces" section on
Chapter 45, "Configuring IP Multicast Routing."
Configuring Interface Characteristics
Chapter 39,
OL-13270-06