Cisco 7206 - VXR Router User Manual

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2-6
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 2 Configuring Basic Interface Parameters
Information About the Basic Interface Parameters
For information on setting the flow-control parameters, see the “Configuring the Flow Control” section
on page 2-30.
Port MTU Size
The maximum transmission unit (MTU) size specifies the maximum frame size that an Ethernet port can
process. For transmissions to occur between two ports, you must configure the same MTU size for both
ports. A port drops any frames that exceed its MTU size.
By default, each port has an MTU of 1500 bytes, which is the IEEE 802.3 standard for Ethernet frames.
Larger MTU sizes are possible for more efficient processing of data with less overhead. The larger
frames, called jumbo frames, can be up to 9216 bytes in size, which is also the default system jumbo
MTU size.
On a Layer 3 interface, you can configure an MTU size between 576 and 9216 bytes. You can configure
up to 64 MTU settings for each I/O module.
Note The global LAN port MTU size applies to the traffic through a Layer 3 Ethernet LAN port that is
configured with a nondefault MTU size.
For a Layer 2 port, you can configure an MTU size that is either the system default (1500 bytes) or the
system jumbo MTU size (initially 9216 bytes).
Note If you change the system jumbo MTU size, Layer 2 ports automatically use the system default MTU size
(1500 bytes) unless you specify the new system jumbo MTU size for some or all of those ports.
For information on setting the MTU size, see the “Configuring the MTU Size” section on page 2-31.
Table 2-3 Port Flow-Control Influences on Link Flow Control
Port Flow Control States
Link Flow
Control State
Port Receiving Data
(Sends Pause Frames)
Port Transmitting Data
(Receives Pause Frames)
Enabled Enabled Enabled
Enabled Desired Enabled
Enabled Disabled Disabled
Desired Enabled Enabled
Desired Desired Enabled
Desired Disabled Disabled
Disabled Enabled Disabled
Disabled Desired Disabled
Disabled Disabled Disabled

Cisco 7206 - VXR Router Specifications

General

Brand	Cisco
Model	7206 - VXR Router
Category	Network Router
Language	English