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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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A physical interface can belong to only one port channel at a time.<br />

Each port channel must contain interfaces of <strong>the</strong> same interface type/speed.<br />

Port channels can contain a mix of 10/100/1000 E<strong>the</strong>rnet interfaces and Gigabit E<strong>the</strong>rnet interfaces, and<br />

<strong>the</strong> interface speed (100 or 1000 Mb/s) used by <strong>the</strong> port channel is determined by <strong>the</strong> first port channel<br />

member that is physically up. <strong>FTOS</strong> disables <strong>the</strong> interfaces that do match <strong>the</strong> interface speed set by <strong>the</strong> first<br />

channel member. That first interface may be <strong>the</strong> first interface that is physically brought up or was<br />

physically operating when interfaces were added to <strong>the</strong> port channel. For example, if <strong>the</strong> first operational<br />

interface in <strong>the</strong> port channel is a Gigabit E<strong>the</strong>rnet interface, all interfaces at 1000 Mb/s are kept up, and all<br />

10/100/1000 interfaces that are not set to 1000 speed or auto negotiate are disabled.<br />

<strong>FTOS</strong> brings up 10/100/1000 interfaces that are set to auto negotiate so that <strong>the</strong>ir speed is identical to <strong>the</strong><br />

speed of <strong>the</strong> first channel member in <strong>the</strong> port channel.<br />

10/100/1000 interfaces in port channels<br />

When both 10/100/1000 interfaces and GigE interfaces are added to a port channel, <strong>the</strong> interfaces must<br />

share a common speed. When interfaces have a configured speed different from <strong>the</strong> port channel speed, <strong>the</strong><br />

software disables those interfaces.<br />

The common speed is determined when <strong>the</strong> port channel is first enabled. At that time, <strong>the</strong> software checks<br />

<strong>the</strong> first interface listed in <strong>the</strong> port channel configuration. If that interface is enabled, its speed<br />

configuration becomes <strong>the</strong> common speed of <strong>the</strong> port channel. If <strong>the</strong> o<strong>the</strong>r interfaces configured in that port<br />

channel are configured with a different speed, <strong>FTOS</strong> disables <strong>the</strong>m.<br />

For example, if four interfaces (Gi 0/0, 0/1, 0/2, 0/3) in which Gi 0/0 and Gi 0/3 are set to speed 100 Mb/s<br />

and <strong>the</strong> o<strong>the</strong>rs are set to 1000 Mb/s, with all interfaces enabled, and you add <strong>the</strong>m to a port channel by<br />

entering channel-member gigabite<strong>the</strong>rnet 0/0-3 while in <strong>the</strong> port channel interface mode, and <strong>FTOS</strong><br />

determines if <strong>the</strong> first interface specified (Gi 0/0) is up. Once it is up, <strong>the</strong> common speed of <strong>the</strong> port<br />

channel is 100 Mb/s. <strong>FTOS</strong> disables those interfaces configured with speed 1000 or whose speed is 1000<br />

Mb/s as a result of auto-negotiation.<br />

In this example, you can change <strong>the</strong> common speed of <strong>the</strong> port channel by changing its configuration so <strong>the</strong><br />

first enabled interface referenced in <strong>the</strong> configuration is a 1000 Mb/s speed interface. You can also change<br />

<strong>the</strong> common speed of <strong>the</strong> port channel in this example, by setting <strong>the</strong> speed of <strong>the</strong> Gi 0/0 interface to 1000<br />

Mb/s.<br />

<strong>Configuration</strong> task list <strong>for</strong> port channel interfaces<br />

To configure a port channel (LAG), you use <strong>the</strong> commands similar to those found in physical interfaces.<br />

By default, no port channels are configured in <strong>the</strong> startup configuration.<br />

The following list includes <strong>the</strong> configuration tasks <strong>for</strong> port channel interfaces:<br />

• Create a port channel (mandatory)<br />

• Add a physical interface to a port channel on page 258 (mandatory)<br />

• Reassign an interface to a new port channel on page 261 (optional)<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 257

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