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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Alireza guest November 28, at 8: Juristium January 18, at 8: That leaves LACP and “on”, both of which have a specific benefit.

Sai guest March 10, at 5: EtherChannel Bandwidth and Costs Etherfhannel, remember that the perceived bandwidth of a port-channel interface is equal to the sum of its active member links.

Interface takes the bubdle mtu that’s why individual interface does not need mtu configured. Use the channel-group channel-group-number mode on interface configuration command in order to manually configure ports to be in the channel group.

I think it was in the BCMSN book that discussed it, but even though you can have from 2 – 8 links in your ether-channel there are distribution advantages to the number of links related to the algorithm that is ran.

I’m wondering why there is even an option to define which protocol to use with the “channel-protocol lacp” or “channel-protocol pagp” command since you dheat the protocol with which mode is used: This time we observe that the port-channel interface is enabled as soon as its first member port cbeat up, as there is no delay imposed by negotiation:.


For cross-stack EtherChannel configurations, ensure that all ports targeted for the EtherChannel are either configured for LACP or are manually configured to be in the channel group. cneat

This increases bandwidth but also enhances redundancy between the switches. For comparison, let’s reconfigure the EtherChannel to function without a negtiation protocol “on” mode: Cisco Spanning Tree Protocol Discussion.


This Doc on Cisco. The ethdrchannel etherchannel load-balance command reveals that source MAC address load-balancing is default on the Catalyst There are two Etherchannel protocols. Direction of flow is also an important detail.

Almost a full three cneat elapsed between the member ports transitioning to the up state and the port-channel interface coming up.

Vishnu guest April 8, at The trunk is useful to pass vlans between switches. 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. Because members etherchqnnel still fail individually, the bandwidth of a port-channel interface can fluctuate without going down. S2 config-if-range channel-group 1 mode passive Creating a port-channel interface Port-channel 1 When the member sbeet on both sides of the EtherChannel are enabled, the port-channel interface also transitions to the up state.

So the moral of the story is use 2,4,or 8 member Port-channels and your port-channels on distro switches need to use IP based load-balancing.

Cisco Switch EtherChannel Configuration – LACP – PAgP

The bundle chsat treated as a single link. Yes it will work also without trunk on the port-channel. They’d been a little ‘thin’ lately It was usefull for me to understand the load balancing feature very well.


Statically configuring an Sheett “on” imposes no delay yet can cause serious problems if not properly configured at both ends. Also something to note with regard to Switch stacks from Cisco’s docs located here: For more information on EtherChannel bandwidth and spanning tree considerations, see Etherchannel costs and failover. Leave a Reply Cancel reply Your email address will not be published.

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The site looks excellent! Configuring destination MAC load-balancing on Ethercchannel is recommended to achieve a more varied distribution of frames and make better use of the available bandwidth. Jeremy, everyday when I have spare time at work I’ve been reading your blog, I have to say: Finally, remember that the perceived bandwidth of a port-channel interface is equal to the sum of its active member links.

These protocols manage the channel establishment between the switches:. Another consideration to make when implementing EtherChannels is the type of load-balancing in effect. More powerful platforms can match etherchsnnel IP address es or layer four port s.

Cisco Switch EtherChannel Configuration – LACP – PAgP

Hopefully my hex to binary math was right. On a 8 member port-channel the load balancing uses the last 3 binary bits. Any of these three mechanisms will suffice for most scenarios, however the choice does deserve some consideration. However, note the timing of the system messages: