Technical data

ServerIron ADX Administration Guide 87
53-1002434-01
Additional system management functions
1
Setting the negotiation mode
You can change the default negotiation mode for Gigabit ports on Chassis devices, by using the
gig-default command. It enables 802.3z negotiation for gigabit over optical fiber. Both sides of the
circuit need to be configured with this feature.
If you enter auto-gig, then gig-default auto-gig is added to the running config.
NOTE
802.3x is flow-control over full-duplex regardless of speed. Half duplex flow control uses
backpressure. 802.3z is gigabit fiber. 802.3ab is gigabit copper.
To set a negotiation mode to off, enter the following command.
ServerIronADX(config)# gig-default neg-off
To override the global setting and set the negotiation mode to auto-Gigabit for ports 4/1 – 4/4,
enter commands such as the following.
ServerIronADX(config)# int ethernet 4/1 to 4/4
ServerIronADX(config-mif-4/1-4/4)# gig-default auto-gig
Syntax: [no] gig-default neg-full-auto | auto-gig | neg-off
The neg-full-auto option specifies that the port first tries to perform a handshake with the other
port to exchange capability information. If the other port does not respond to the handshake
attempt, the port uses the manually configured configuration information (or the defaults if an
administrator has not set the information). This is the default for Chassis devices.
The auto-gig option specifies that the port tries to perform a handshake with the other port to
exchange capability information. This is still the default for Stackable devices.
The neg-off option specifies that the port does not try to perform a handshake. Instead, the port
uses configuration information manually configured by an administrator.
Defining the performance mode
You can define the performance mode as 'high' to allow flow control to activate at an earlier stage,
when heavy congestion exists on the network. This feature must be saved to memory and the
system reset before it becomes active.
To define the performance mode as high, enter commands such as the following.
ServerIronADX(config)# perf-mode hi
Reload required. Please write memory and then reload or power cycle.
ServerIronADX(config)# write memory
.Write startup-config in progress.
.Write startup-config done.
ServerIronADX(config) # exit
ServerIronADX# reload
Syntax: [no] perf-mode
Forwarding Layer 2 and Layer 3 pass-through traffic to the CPU
By default, the ServerIron ADX forwards Layer 2 and Layer 3 pass-through traffic in hardware. It
forwards Layer 4 – Layer 7 pass-through traffic to the CPU for processing.