Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 771)

Multi-Service IronWare Switching Configuration Guide 741
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Configuring IP parameters
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• The MAC address of the next-hop gateway toward the packet’s destination.
• An Ethernet broadcast address.
The entire IP packet, including the source address, destination address, other control information,
and the data, is placed in the data portion of the Layer 2 packet. Typically, an Ethernet network
uses one of two different formats of Layer 2 packet:
• Ethernet II
• Ethernet SNAP (also called IEEE 802.3)
The control portions of these packets differ slightly. All IP devices on an Ethernet network must use
the same format. The Brocade device uses Ethernet II by default. You can change the IP
encapsulation to Ethernet SNAP on individual ports if needed.
NOTE
All devices connected to the Brocade device port must use the same encapsulation type.
To change the IP encapsulation type on interface 1/5 to Ethernet SNAP, enter the following
commands.
Brocade(config)# int e 1/5
Brocade(config-if-e1000-1/5)# ip encapsulation snap
Syntax: [no] ip encapsulation snap | ethernet-2
Setting the maximum frame size globally
You can set the default maximum frame size to control the maximum size of Ethernet frames that
the Ethernet MAC framers will accept or transmit. The size is counted from the beginning of
Ethernet header to the end of CRC field. The default maximum frame size must be greater than an
IP MTU value set using the
“Globally changing the IP MTU” on page 743.
To set a maximum frame size that applies to the device for Ethernet ports, enter a command such
as the following.
Brocade(config)# default-max-frame-size 2000
Brocade(config)# write memory
Brocade(config)# reload
Syntax: [no] default-max-frame-size bytes
Enter 1298 - 9216 for bytes. On Brocade NetIron XMR and Brocade MLX series devices, the default
is 1548 bytes for Ethernet ports.
On Brocade NetIron CES devices, the bytes variable specifies a even number of bytes between
1298 - 9216. The default value is 1548 bytes.
NOTE
You must run the write memory command and reload the Brocade device for the
default-max-frame-size command to take effect.