Configuring EtherChannels. LACP EtherChannels and the ad provider- bridge mode are mutually exclusive. LACP. EtherChannels cannot transmit traffic . Cheatsheet. no comment on–Enable Etherchannel only “Manual On Mode” passive–Enable Switch1(config)# interface port-channel 2. Part of Cisco Networking All-in-One For Dummies Cheat Sheet EtherChannel allows you to take up to eight network ports on your switch and treat them as a.

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Hi Jeremy, About the last part. I figured it out! I just banged this out real quick. LACP helps protect against switching loops caused by misconfiguration; when enabled, an EtherChannel will only be formed after successful negotiation between its two ends. However, note the timing of the system messages:.

Only a single line is needed to configure a group of ports as an EtherChannel: UTC EtherChannel is Cisco’s term for bundling two or more physical Ethernet links for the purposes of aggregating available bandwidth and, to a lesser extent, providing a measure of physical redundancy. The “show configuration failed” command doesn’t really give any specific reason as to why the link can not be added.

Yes it will work also without trunk on the port-channel. On a 4 member port-channel the load balancing uses the last 2 binary bits.

EtherChannel considerations

The site looks excellent! S2 config-if-range channel-group 1 mode passive Creating a port-channel interface Port-channel 1 When the member ports on both sides of the EtherChannel are enabled, the port-channel interface also transitions to the up state.


Use the channel-group channel-group-number mode on interface configuration command in order to manually configure ports to be in the channel group. You can reach him by email or follow him on Twitter. However, this negotiation introduces an overhead and delay in initialization.

So if you were using src-mac load balancing on a layer-3 port-channel all the data would go down the same member, because the packet gets the interfaces source mac. With EtherChannel configured, multiple links are grouped into a port-channel, which is assigned its own configurable virtual interface.

EtherChannel considerations By stretch Monday, January 18, at 4: Assume we have a Data Room switch providing access to servers. With Etherchannel, we can bundle together up to 8 interfaces to form a single logical link Port-Channel and traffic is load-balanced between all interfaces.

Which fields are considered is dependent on the switch platform and configuration. Most “explanations” assume the reader knows what static is, passing it over in their explanation.

Once it did, we can see the state of the EtherChannel has changed to “in use”:. If the last hex character is E the last two binary bits are 10 so it will use member number 2. For comparison, let’s reconfigure the EtherChannel to function without a negtiation protocol “on” mode:. Each protocol eherchannel above has three modes of operation which dictate if the switch will actively seek to form an Etherchannel link or will wait for the other end to form the link.


Etherchannel – Network Interview QnA

I have configured the etherchannel in L2 switch for 2 links but when a single link gets down packet loss is not coming but when the same link comes up i am getting the packet loss can any one suggest how resolve the problem. However, note the timing fheat the system messages: On a 8 member port-channel the load balancing uses the last 3 binary bits.

If the last hex character is 1 the last two binary bits are sehet so it will use member number 1. Note the S indicating layer two operation; on multilayer platforms, EtherChannel interfaces can be configured for routed operation as well.

Cheat Sheets

We can inspect the health etherchanenl the EtherChannel with the show etherchannel summary command: There are two Etherchannel protocols. Interface Port-channel1, changed state to up Almost a full three seconds elapsed between the member ports transitioning to the up state and the port-channel interface coming up.

Finally, remember that the perceived bandwidth of a port-channel interface is equal to the sum of its active member links.