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User Guide for Cisco Security Manager 4.4
OL-28826-01
Chapter 59 Configuring Router Interfaces
Basic Interface Settings on Cisco IOS Routers
Step 9 Define additional properties of the interface/subinterface:
• Use the Negotiation check box to enable and disable auto-negotiation for the interface.
Auto-negotiation detects the capabilities of remote devices and negotiates the best possible
performance between the two devices. When Negotiation is enabled, the Fast Ethernet Duplex and
Speed options are disabled.
Note Auto-negotiation is available only for Fast Ethernet and Gigabit Ethernet interfaces on
ASR devices.
• Choose a transmission mode from the Duplex list. If you choose Auto, be sure the network device
to which this interface is connected is set to automatically detect the transmission mode. (Auto is
not available on ASRs; use auto-negotiation instead.)
Note You must configure a fixed speed to define the duplex value. Tunnel and loopback interfaces do
not support this setting.
• Choose a transmission speed from the Speed list. If you choose Auto, be sure the network device to
which this interface is connected is set to automatically detect the transmission speed. (Auto is not
available on ASRs; use auto-negotiation instead.)
• Enter the maximum transmission unit (MTU), which defines the largest packet size, in bytes, that
this interface can support.
Note Certain interface properties are set automatically, or are unavailable, depending on the interface
type and the underlying port type. For example, the Speed options are available for Fast Ethernet
and Gigabit Ethernet interfaces only.
Step 10 Choose an encapsulation method from the Encapsulation list:
• None—No encapsulation; no additional parameters are required.
• (Ethernet subinterfaces only) DOT1Q—VLAN encapsulation, as defined by the IEEE 802.1Q
standard. Provide the following VLAN parameters for this subinterface:
–
Enter a VLAN ID to associate with this subinterface.
Note All VLAN IDs must be unique among all subinterfaces configured on the same physical
interface.
–
If you are defining the 802.1Q trunk interface, select Native VLAN.
Tip To configure DOT1Q encapsulation on an Ethernet interface without associating a VLAN with
the subinterface, enter the vlan-id dot1qcommand using CLI commands or FlexConfigs. See
Understanding FlexConfig Policies and Policy Objects, page 7-2. Configuring VLANs on the
main interface increases the number of VLANs that can be configured on the router.
• (Serial interfaces only) Frame Relay—IETF Frame Relay encapsulation. Provide a data-link
connection identifier (DLCI) for the subinterface.