Layer 2 etherchannel

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1. Before configuring the vswitch ports to the Channel group members, make sure these ports are all the same. Otherwise, the channelgroup cannot bind the ports together.

2. in Port setting mode, the channel-group 1 on mode directly keeps the port away from portaggregation protocol (pagp) and link aggregation Control Protocol (lacp) mode. The on mode must be used for both segments.

3. SPT selects rootbridge Based on bridgeid. The smaller the size, the higher the base.

4. etherchannel can make use of the sptblocking port and make full use of the bandwidth. The SPT regards the etherchannel as a port, so it does not block the member ports in the etherchannel.

5. disable the port before configuring the port. before configuring the port, let's talk about the channel-group mode, active, unconditionally enable lacp (public), and auto only enable pagp. If pagp is detected (Cisco proprietary) device, desirable unconditionally starts pagp, on only opens etherchannel, passive only enables lacp if it detects lacp device.

6. After the configuration, you can see that the port-channel1 is also a port

7. You can configure port-Channel 1 to the trunk mode.

8. through show etherchannelport-channel, it is found that aggregation protocol is not used, Port-channel Ag-not-inuse. through showetherchannel summary, we can see that PO1 (US), u is in use, and S is layer2.

Pagp/lacp

1. both pagp and lacp support eight connections. lacp supports 16 ports, but eight are backed up. In hotstandby mode, port priority and portid are used to determine which port is activated, the smaller the value, the better.

2. Set port lacp port-priority 100 to port activation rather than standby.

3. When the device ID of a vswitch is low, the decision-making layer (MAC address) determines the port priority, unless you set the system priority to low.

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