Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 389)

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Port Channel Benefits

A port channel interface provides many benefits, including easy management, link redundancy, and

sharing.

Port channels are transparent to network configurations and can be modified and managed as one

interface. For example, you configure one IP address for the group and that IP address is used for all

routed traffic on the port channel.

With this feature, you can create larger-capacity interfaces by utilizing a group of lower-speed links. For

example, you can build a 5-Gigabit interface by aggregating five 1-Gigabit Ethernet interfaces together. If

one of the five interfaces fails, traffic is redistributed across the four remaining interfaces.

Port Channel Implementation

Dell Networking OS supports static and dynamic port channels.

• Static — Port channels that are statically configured.

• Dynamic — Port channels that are dynamically configured using the link aggregation control protocol

(LACP). For details, refer to Link Aggregation Control Protocol (LACP).

There are 128 port-channels with eight members per channel.

NOTE: If you are using either 10G ports or 40G ports, the S6000 supports eight members per LAG.

As soon as you configure a port channel, Dell Networking OS treats it like a physical interface. For

example, IEEE 802.1Q tagging is maintained while the physical interface is in the port channel.

Member ports of a LAG are added and programmed into the hardware in a predictable order based on

the port ID, instead of in the order in which the ports come up. With this implementation, load balancing

yields predictable results across line card resets and chassis reloads.

A physical interface can belong to only one port channel at a time.

Each port channel must contain interfaces of the same interface type/speed.

Port channels can contain a mix of 10, 100, or 1000 Mbps Ethernet interfaces and Gigabit Ethernet

interfaces. The interface speed (10, 100, or 1000 Mbps) the port channel uses is determined by the first

port channel member that is physically up. Dell Networking OS disables the interfaces that do match the

interface speed that the first channel member sets. That first interface may be the first interface that is

physically brought up or was physically operating when interfaces were added to the port channel. For

example, if the first operational interface in the port channel is a Gigabit Ethernet interface, all interfaces

at 1000 Mbps are kept up, and all 10/100/1000 interfaces that are not set to 1000 speed or auto

negotiate are disabled.

Dell Networking OS brings up 10/100/1000 interfaces that are set to auto negotiate so that their speed is

identical to the speed of the first channel member in the port channel.

10/100/1000 Mbps Interfaces in Port Channels

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

share a common speed. When interfaces have a configured speed different from the port channel speed,

the software disables those interfaces.

The common speed is determined when the port channel is first enabled. At that time, the software

checks the first interface listed in the port channel configuration. If you enabled that interface, its speed

Interfaces

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