Brocade BigIron RX Series Configuration Guide - Manual (Page 260)

182 BigIron RX Series Configuration Guide
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Configuring packet parameters
7
• 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 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 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.
BigIron RX(config)# interface ethernet 1/5
BigIron RX(config-if-e1000-1/5)# ip encapsulation snap
Syntax: ip encapsulation snap | ethernet-2
Setting maximum frame size per PPCR
You can set a maximum frame size of IP packets that are forwarded on all ports of a PPCR. You can
set a maximum frame size globally and per interface.
Globally setting the maximum frame size (jumbo frame)
To set a maximum frame size (otherwise referred to as jumbo frame) that applies to the device,
enter a command such as the following.
BigIron RX(config)# default-max-frame-size 2000
BigIron RX(config)# write memory
BigIron RX(config)# reload
Syntax: default-max-frame-size <bytes>
Enter 64 – 9212 for <bytes>. The default is 1518 bytes.
Setting a maximum frame size per interface
When you set a maximum frame size on an interface, that size applies to all ports in a PPCR.
Table 52 shows the ports of each Interface module.
To set a maximum frame size for all the ports attached to a PPCR, enter a command such as the
following at the Interface Configuration level.
TABLE 52 Available ports per PPCR
Module type Number of packet
processors (PPCR) Ports in a PPCR
PPCR1 PPCR2 PPCR3 PPCR4
24 x 1G 2 1 - 12 13 - 24 N/A N/A