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Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 8 Configuring Interfaces
Starting Interface Configuration (ASA 5510 and Higher)
parameters. For RJ-45 interfaces on the ASA 5500 series adaptive security appliance, the default
auto-negotiation setting also includes the Auto-MDI/MDIX feature. See the “Auto-MDI/MDIX
Feature” section on page 8-5.
d. For the ASA 5580 10 Gigabit Ethernet interfaces, to enable pause (XOFF) frames for flow control
on 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 Watermark. The default value is 128 KB; you can set it between 0 and 511. After a pause is
sent, an XON frame can be sent when the buffer usage is reduced below the Low Watermark. By
default, the value is 64 KB; you can set it between 0 and 511. The link partner can resume traffic
after receiving an XON, or after the XOFF expires, as controlled by the Pause Time value in the
pause frame. The default value is 26624; you can set it between 0 and 65535. If the buffer usage is
consistently above the High Watermark, 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.
Note Only flow control frames defined in 802.3x are supported. Priority-based flow control is not
supported.
e. Click OK to accept the Hardware Properties changes.
Step 6 Click OK to accept the Interface changes.
What to Do Next
Optional Tasks:
• Configure redundant interface pairs. See the “Configuring a Redundant Interface” section on
page 8-12.
• Configure VLAN subinterfaces. See the “Configuring VLAN Subinterfaces and 802.1Q Trunking”
section on page 8-14.
Required Tasks:
• For multiple context mode, assign interfaces to contexts and automatically assign unique MAC
addresses to context interfaces. See the “Assigning Interfaces to Contexts and Automatically
Assigning MAC Addresses (Multiple Context Mode)” section on page 8-16.
• For single context mode, complete the interface configuration. See the “Completing Interface
Configuration (All Models)” section on page 8-21.
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