Cisco Systems 3560 Manual De Usuario

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 or 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 

 for information about what happens when hardware resource limitations are reached.

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 ISL or 
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 

When you create an SVI, it does not become active until it is associated with a physical port.

SVIs support routing protocols and bridging configurations. For more information about configuring IP 
routing, see 

 

The IP base image supports static routing and RIP; for more advanced routing or for fallback bridging, 
you must have the IP services image installed on the switch.

The line state of an SVI with multiple ports on a VLAN is in the up state when it meets these conditions:

The VLAN exists and is active in the VLAN database on the switch.

The VLAN interface exists and is not administratively down.

At least one Layer 2 (access or trunk) port exists, has a link in the up state on this VLAN, and is in 
the spanning-tree forwarding state on the VLAN.

The protocol link state for VLAN interfaces come up when the first switchport belonging to the 
corresponding VLAN link comes up and is in STP forwarding state.

The default action, when a VLAN has multiple ports, is that the SVI goes down when all ports in the 
VLAN go down. You can use the SVI autostate exclude feature to configure a port so that it is not 
included in the SVI line-state up-an- down calculation. For example, if the only active port on the VLAN