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1. Cisco CCNA / CCNP Certification: How And Why To construct An Etherchannel CCNA and CCNP candidates are very well-versed in Spanning-Tree Protocol, and among the list of fantastic points about STP is it really works nicely with little if any further configuration. There is certainly one particular condition exactly where STP will work in opposition to us only a little bit whilst it helps prevent switching loops, and that's the problem where two switches have a number of physical connections. You'd probably feel that if you have two independent Actual physical connections involving two switches, two times as much data may be despatched from one particular change on the apart from if there was only one link. STP doesn’t permit this by default, having said that in an effort to prevent switching loops from forming, one of several paths will probably be blocked. SW1 and SW2 are connected through two independent Actual physical connections, on ports fast0/eleven and speedy 0/twelve. As we could see in this article on SW1, only port 0/11 is actually forwarding visitors. STP has put the opposite port into blocking mode (BLK). SW1#display spanning vlan ten (some output eradicated for clarity) Interface Part Sts Charge Prio.Nbr Variety Fa0/eleven Root FWD 19 128.eleven P2p Fa0/twelve Altn BLK 19 128.12 P2p While STP is helping us by avoiding switching loops, STP is additionally hurting us by stopping us from utilizing a perfectly legitimate path concerning SW1 and SW2. We could basically double the bandwidth accessible concerning The 2 switches if we could use that path which is now being blocked. The key to utilizing the presently blocked path is configuring an Etherchannel. An Etherchannel is actually a rational bundling of two – 8 Bodily connections amongst two Cisco switches. Configuring an Etherchannel is definitely rather straightforward. Utilize the command “channel-team one method on” on every single port you want to be placed in the Etherchannel. Not surprisingly, this needs to be completed on both of those switches when you configure an Etherchannel on a single switch and don’t do this on the correct ports on another change, the road protocol will go down and continue to be there. The beauty of an Etherchannel is the fact that STP sees the Etherchannel as a person relationship. If any with the physical connections Within the Etherchannel go down, STP would not see this, and STP will likely not recalculate.

2. Even though traffic movement amongst The 2 switches will cPanel Hosting naturally be slowed, the delay in transmission brought on by an STP recalculation is averted. An Etherchannel also enables us to work with several Actual physical connections at one particular time. Below’s how you can set these ports into an Etherchannel: SW1#conf t Enter configuration instructions, a person for each line. Stop with CNTL/Z. SW1(config)#interface quick 0/11 SW1(config-if)#channel-group one method on Creating a port-channel interface Port-channel one SW1(config-if)#interface rapid 0/twelve SW2#conf t SW2(config)#int speedy 0/eleven SW2(config-if)#channel-team one method on SW2(config-if)#int quickly 0/twelve The command “display interface trunk” and “present spanning-tree vlan 10” is going to be utilized to validate the Etherchannel configuration. SW2#show interface trunk (some output removed for clarity) Port Mode Encapsulation Standing Indigenous vlan Po1 desirable 802.1q trunking one SW2#clearly show spanning vlan 10 (some output taken off for clarity) Po1 Desg FWD 12 128.65 P2p Prior to configuring the Etherchannel, we noticed person ports in this article. Now we see “Po1”, which stands for the interface “port-channel1”. This is actually the logical interface designed when an Etherchannel is created. We are now applying both equally Actual physical paths between the two switches at just one time! That’s one particular key reward in motion Permit’s see Yet another. Ordinarily, if The only open path concerning two trunking switches goes down, There exists an important delay though A different valid path is opened – near to a minute in certain circumstances. We'll now shut down port 0/eleven on SW2 and see the impact on the etherchannel. SW2(config-if)#shutdown

3. 3w0d: %LINK-5-Improved: Interface FastEthernet0/11, transformed point out to administratively down SW2#exhibit spanning vlan ten VLAN0010 Spanning tree enabled protocol ieee Po1 Desg FWD 19 128.sixty five P2p SW2#present interface trunk Port Manner Encapsulation Status Native vlan Po1 attractive 802.1q trunking one The Etherchannel did not go down! STP sees the Etherchannel as just one backlink for that reason, in terms of STP is concerned, nothing at all took place. Constructing an Etherchannel and figuring out how it may advantage your community is An important ability for CCNA and CCNP achievement, and it is available in extremely useful on The task also. Ensure you are snug with making one right before taking Cisco’s exams!