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K-23
User Guide for Cisco Security Manager 3.2
OL-16066-01
Appendix K Router Platform User Interface Reference
Router Interfaces Page
VLAN ID Applies only to subinterfaces with encapsulation type DOT1Q.
The VLAN ID associated with this subinterface. The VLAN ID specifies
where 802.1Q tagged packets are sent and received on this subinterface;
without a VLAN ID, the subinterface cannot send or receive traffic. Valid
values range from 1 to 4094.
Note All VLAN IDs must be unique among all subinterfaces configured
on the same physical interface.
Tip To configure DOT1Q encapsulation on an Ethernet interface without
associating the VLAN with a subinterface, enter the vlan-id dot1q
command using CLI commands or FlexConfigs. See Understanding
FlexConfig Objects, page 9-52. Configuring VLANs on the main
interface increases the number of VLANs that can be configured on
the router.
Native VLAN Applies only when the encapsulation type is DOT1Q and you are configuring
a physical interface that is meant to serve as an 802.1Q trunk interface.
Trunking is a way to carry traffic from several VLANs over a point-to-point
link between two devices.
When selected, the Native VLAN is associated with this interface, using the
ID specified in the VLAN ID field. (If no VLAN ID is specified for the
Native VLAN, the default is 1.) The native VLAN is the VLAN to which all
untagged VLAN packets are logically assigned by default. This includes the
management traffic associated with the VLAN. If no VLAN ID is defined,
the default is 1.
For example, if the VLAN ID of this interface is 1, all incoming untagged
packets and packets with VLAN ID 1 are received on the main interface and
not on a subinterface. Packets sent from the main interface are transmitted
without an 802.1Q tag.
When deselected, the Native VLAN is not associated with this interface.
Note The Native VLAN cannot be configured on a subinterface of the
trunk interface. Be sure to configure the same Native VLAN value at
both ends of the link; otherwise, traffic may be lost or sent to the
wrong VLAN.
Table K-10 Create Router Interface Dialog Box (Continued)