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12-25
Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 12 Starting Interface Configuration (ASA 5510 and Higher)
Starting Interface Configuration (ASA 5510 and Higher)
a. For slot 1 on the ASA 5550 ASA or the 4GE SSM, you can choose either RJ-45 or SFP from the
Media Type drop-down list.
RJ-45 is the default.
b. To set the duplex for RJ-45 interfaces, choose Full, Half, or Auto, depending on the interface type,
from the Duplex drop-down list.
Note The duplex setting for an EtherChannel interface must be Full or Auto.
c. To set the speed, choose a value from the Speed drop-down list.
The speeds available depend on the interface type. For SFP interfaces, you can set the speed to
Negotiate or Nonegotiate. Negotiate (the default) enables link negotiation, which exchanges
flow-control parameters and remote fault information. Nonegotiate does not negotiate link
parameters. For RJ-45 interfaces on the ASA 5500 series ASA, the default auto-negotiation setting
also includes the Auto-MDI/MDIX feature. See the “Auto-MDI/MDIX Feature” section on
page 12-2.
d. To enable pause (XOFF) frames for flow control on 1-Gigabit and 10-Gigabit Ethernet interfaces,
check the Enable Pause Frame check box.
If you have a traffic burst, dropped packets can occur if the burst exceeds the buffering capacity of
the FIFO buffer on the NIC and the receive ring buffers. Enabling pause frames for flow control can
alleviate this issue. Pause (XOFF) and XON frames are generated automatically by the NIC
hardware based on the FIFO buffer usage. A pause frame is sent when the buffer usage exceeds the
high-water mark. The default high_water value is 128 KB (10 GigabitEthernet) and 24 KB
(1 GigabitEthernet); you can set it between 0 and 511 (10 GigabitEthernet) or 0 and 47 KB
(1 GigabitEthernet). After a pause is sent, an XON frame can be sent when the buffer usage is
reduced below the low-water mark. By default, the low_water value is 64 KB (10 GigabitEthernet)
and 16 KB (1 GigabitEthernet); you can set it between 0 and 511 (10 GigabitEthernet) or 0 and
47 KB (1 GigabitEthernet). The link partner can resume traffic after receiving an XON, or after the
XOFF expires, as controlled by the timer value in the pause frame. The default pause_time value is
26624; you can set it between 0 and 65535. If the buffer usage is consistently above the high-water
mark, pause frames are sent repeatedly, controlled by the pause refresh threshold value.
To change the default values for the Low Watermark, High Watermark, and Pause Time, uncheck
the Use Default Values check box.