Bài viết sưu tầm

Sau đây, là phần tóm tắt một số ý chính về phần channel-group (SV cố gắng dich các thuật ngữ tiếng anh phổ biến liên quan môn học)

 

For Layer 2 EtherChannels, the channel-group command automatically creates the port-channel interface

when the channel group getsitsfirst physical port. You do not have to use the interfaceport-channel command

in global configuration mode to manually create a port-channel interface. If you create the port-channel

interface first, the channel-group-number can be the same as the port-channel-number, or you can use a new

number. If you use a new number, the channel-group command dynamically creates a new port channel.

Although it is not necessary to disable the IPaddress that is assigned to a physical port that is part of a channel

group, we strongly recommend that you do so.

You create Layer 3 port channels by using the interfaceport-channel command followed by theno switchport

interface configuration command. Manually configure the port-channel logical interface before putting the

interface into the channel group.

After you configure an EtherChannel, configuration changes that you make on the port-channel interface

apply to all the physical ports assigned to the port-channel interface. Configuration changes applied to the

physical port affect only the port where you apply the configuration. To change the parameters of all ports in

an EtherChannel, apply configuration commands to the port-channel interface, for example, spanning-tree

commands or commands to configure a Layer 2 EtherChannel as a trunk.

Active mode places a port into a negotiating state in which the port initiates negotiations with other ports by

sending LACP packets. A channel is formed with another port group in either the active or passive mode.

Auto mode places a port into a passive negotiating state in which the port responds toPAgPpackets it receives

but does not start PAgP packet negotiation. A channel is formed only with another port group in desirable

mode. When auto is enabled, silent operation is the default.

Desirable mode places a port into an active negotiating state in which the port starts negotiations with other

ports by sending PAgP packets. An EtherChannel is formed with another port group that is in the desirable

or auto mode. When desirable is enabled, silent operation is the default.

If you do not specify non-silent with the auto or desirable mode, silent is assumed. The silent mode is used

when the switch is connected to a device that is not PAgP-capable and rarely, if ever, sends packets. An

example of a silent partner is a file server or a packet analyzer that is not generating traffic. In this case, running

PAgP on a physical port prevents that port from ever becoming operational. However, it allows PAgP to

operate, to attach the port to a channel group, and to use the port for transmission. Both ends of the link cannot

be set to silent.

In on mode, a usable EtherChannel exists only when both connected port groups are in the on mode.

 

This example shows how to configure an EtherChannel on a single switch in the stack. It assigns two

static-access ports in VLAN 10 to channel 5 with the PAgP mode desirable:

Switch# configure terminal

Switch(config)# interface range GigabitEthernet 2/0/1 - 2

Switch(config-if-range)# switchport mode access

Switch(config-if-range)# switchport access vlan 10

Switch(config-if-range)# channel-group 5 mode desirable

Switch(config-if-range)# end