Cisco Systems OL-16066-01 appendix Mtu

Appendix K Router Platform User Interface Reference

Router Interfaces Page

Table K-10	Create Router Interface Dialog Box (Continued)
Speed		Applies only to Fast Ethernet and Gigabit Ethernet interfaces.
		The speed of the interface:
		• 10—10 megabits per second (10Base-T networks).
		• 100—100 megabits per second (100Base-T networks). This is the
		default for Fast Ethernet interfaces.
		• 1000—1000 megabits per second (Gigabit Ethernet networks). This is
		the default for Gigabit Ethernet interfaces.
		• Auto—The router automatically detects and sets appropriate interface
		speed.
		Note When using Auto mode, be sure that the port on the active network
		device to which you connect this interface is also set to automatically
		negotiate the transmission speed. Otherwise, select the appropriate
		fixed speed.
MTU		The maximum transmission unit, which refers to the maximum packet size,
		in bytes, that this interface can handle.
		Valid values for serial, Ethernet, and Fast Ethernet interfaces range from 64
		to 17940 bytes.
		Valid values for Gigabit Ethernet interfaces range from 1500 to 9216 bytes.
Encapsulation		The type of encapsulation performed by the interface:
		• None—No encapsulation.
		• DOT1Q—VLAN encapsulation, as defined by the IEEE 802.1Q
		standard. Applies only to Ethernet subinterfaces.
		• Frame Relay—IETF Frame Relay encapsulation. Applies only to serial
		interfaces (not serial subinterfaces).
		Note IETF Frame Relay encapsulation provides interoperability between
		a Cisco IOS router and equipment from other vendors. To configure
		Cisco Frame Relay encapsulation, use CLI commands or
		FlexConfigs.

	User Guide for Cisco Security Manager 3.2
K-22	OL-16066-01