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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On a 8 member port-channel the load balancing uses the last 3 binary bits. Because members can still fail individually, the bandwidth of a port-channel interface can fluctuate without going down. I want o add 4 more 10 gig links to the bundle to make etherchanjel 16x Almost a full three seconds elapsed between the member ports transitioning to the up state and the port-channel interface coming up.

EtherChannel considerations –

More powerful platforms can match against IP address es or layer four port s. LACP helps protect against switching loops caused by misconfiguration; when enabled, an EtherChannel will only be ethrrchannel after successful negotiation between its two ends. Yeah 2, 4, and 8 are the most efficient ways to go. This switch is connected to a Distribution switch which aggregates traffic from several user access switches. The 3 links are up and running just fine but when I give this command “bundle id 50 mode active” and then do “commit” it does not commit and asked me to run “show configuration failed” command.

Under normal conditions, all but one redundant physical link between two switches will be disabled by STP at one end.

If the last hex character is 8 the last two binary bits are 00 so it will use member number 0. The bundle ethercnannel treated as a single link.

Comments Dear Sir, if i do not use the trunk port command,,then it will work for LACP or not…means i do not use trunk for vlan thanks. I was configuring mtu on the interface which I shouldn’t be doing. Once it did, we can see the state of the EtherChannel has changed to “in use”:. On nexus I was able to create 16×10 bundle but on CRS1 I was only able to add one link but 3 other links getting error.


If the last hex character is F the last two binary bits are 11 so it will use member number 3.

Talal guest May 13, at I can write often, or I can write thoroughly. Amazon Disclosure We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to amazon. If we connect the two switches together with a single 1Gbps interface, then it could potentially be a bottleneck to traffic from users to servers especially for high-volume applications.

Which fields are considered is dependent on the switch platform and configuration. 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 hceat. Statically configuring an EtherChannel “on” imposes no delay yet can cause serious problems if not properly configured at both ends.

If source MAC load-balancing is in use, these frames will be forwarded down only one member link, because the outcome of the hash function will always be the same. For example, a Catalyst can match only against a frame’s destination or source MAC address:.

EtherChannel considerations

Steve guest February 16, at 2: Man, that’s some skill Switchport configurations applied to this interface are replicated to the physical member interfaces. This time we observe that the port-channel interface is enabled as soon as its etherchannnel member port comes up, as there is no delay imposed by etherchanne. However, note the timing of the system messages: In our example above, 4x1Gbps interfaces were bundled together thus forming a 4Gbps pipe from users to servers.

When the member ports on both sides of the EtherChannel are enabled, the port-channel interface also transitions to the up state. Ciscotime guest January 23, at 6: Finally, remember that the perceived bandwidth of a port-channel interface is equal to the sum of its active member links.


Vishnu guest April 8, at We use technologies, such as cookies, to customize content and advertising, to provide social media features and to analyse traffic to the site. Passive interfaces merely respond to LACP requests. Deep6 February 18, at 3: While access can use MAC. By configuring Etherchannel, the bundle is considered as a single logical interface and there are no spanning tree dheet. 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.

Use the channel-group ethefchannel mode on interface configuration command in order to manually configure ports to be in the channel group. Ciscotime guest January 19, at 9: The trunk is useful to pass vlans between switches. Also something to note with regard to Switch stacks from Cisco’s docs located here: Jeremy, everyday when I have spare time at work I’ve been reading your blog, I have cbeat say: If the last hex character is 1 the last two binary bits are 01 so it will etherchamnel member number 1.

On a 4 member PO using mac load-balancing the following is true: My lab is offline right now so I can’t test without taking users etherchanbel.

Etherchannel – Network Interview QnA

They’d been a little ‘thin’ lately The “show configuration failed” command doesn’t really give any specific reason as to why the link can not be added. We can inspect the health syeet the EtherChannel with the show etherchannel summary command: As noted, a virtual port-channel interface Port-channel1 has been created to represent the logical link.

Alireza guest November 28, at 8: This Doc on Cisco.