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User Guide for Cisco Security Manager 4.4
OL-28826-01
Chapter 59 Configuring Router Interfaces
Router Interfaces Page
Duplex The interface transmission mode:
• None—The transmission mode is returned to its device-specific
default setting.
• Full—The interface transmits and receives at the same time (full
duplex).
• Half—The interface can transmit or receive, but not at the same
time (half duplex). This is the default.
• Auto—The router automatically detects and sets the appropriate
transmission mode, either full or half duplex. Not available on
ASRs; use auto-negotiation instead.
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 mode. Otherwise,
select the appropriate fixed mode.
Note You can configure a duplex value only if you set the Speed to a
fixed speed, not Auto.
Note This setting does not apply to serial, HSSI, ATM, PRI, DSL,
tunnel, or loopback interfaces.
Speed Applies only to Fast Ethernet and Gigabit Ethernet interfaces.
The speed of the interface:
• None—The setting is not configurable on the device.
• 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. Not available on ASRs; use auto-negotiation.
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.
Table 59-3 Create Router Interface Dialog Box (Continued)
Element Description