Switch Virtual Interfaces - Cisco ME 3400G-2CS - Ethernet Access Switch Software Configuration Manual

Chapter 9 Configuring Interface Characteristics
Note Entering a no switchport interface configuration command shuts down the interface and then re-enables
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 9-20
For more information about IP unicast and multicast routing and routing protocols, see
"Configuring IP Unicast Routing"
For full Layer 3 routing, you must have the metro IP access image installed on the switch
Note

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 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.
Note You cannot delete interface VLAN 1.
SVIs provide IP host connectivity only to the system; in Layer 3 mode, you can configure routing across
SVIs.
Although the switch supports a total of 1005 VLANs (and SVIs), the interrelationship between the
number of SVIs and routed ports and the number of other features being configured might impact CPU
performance because of hardware limitations. See the
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SVIs are created the first time that you enter the vlan interface configuration command for a VLAN
interface. The VLAN corresponds to the VLAN tag associated with data frames on an IEEE 802.1Q
encapsulated trunk or the VLAN ID configured for an access port. Configure a VLAN interface for each
VLAN for which you want to route traffic, and assign it an IP address. For more information, see the
"Manually Assigning IP Information" section on page
When you create an SVI, it does not become active until it is associated with a physical port.
Note
SVIs support routing protocols. For more information about configuring IP routing, see
"Configuring IP Unicast Routing,"
Routed ports (or SVIs) are supported only when the metro IP access image is installed on the switch.
Note
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for information about what happens when hardware resource limitations are reached.
and
for information about what happens when hardware resource limitations are reached.
and
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
"Configuring Layer 3 Interfaces" section on
Chapter 34, "Configuring IP Multicast Routing."
"Configuring Layer 3 Interfaces" section on
3-9.
Chapter 34, "Configuring IP Multicast Routing."
Understanding Interface Types
Chapter 32,
Chapter 32,
9-5