Configure an EtherChannel between 2 switches and a server

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I have a customer wanting me to do a couple of things that I need clarification on. First I have an existing catalyst 4006 switch that we are adding a new module to (mod 6). We also are putting in a new switch (catalyst 2948). The customer is wanting to trunk the 4006 to the 2948 on ports: on the 4006 switch 6/23,31,39,47 and on the 2948 ports 2/23,31,39,47. I have the config set as follows: set the trunking on the 4006 switch set trunk 6/23 nonegotiate dot1q 1-1005 set trunk 6/31 nonegotiate dot1q 1-1005 set trunk 6/39 nonegotiate dot1q 1-1005 set trunk 6/47 nonegotiate dot1q 1-1005 set port channel 6/23,6/31,6/39,6/47 mode on on the new 2948 switch I have: set trunk 2/23 nonegotiate dot1q 1-1005 set trunk 2/31 nonegotiate dot1q 1-1005 set trunk 2/39 nonegotiate dot1q 1-1005 set trunk 2/47 nonegotiate dot1q 1-1005 set port channel 2/23,2/31,2/39,2/47 mode on. Is this the correct procedure. The IOS on both are up to date. I just updated the IOS on the 4006 to v7.4(3) and the 2948 switch is new with an IOS of 8.3(2). Both are cat OS's. He is also wanting to setup 2 servers that will be a part of a new vlan that I am creating called vlan4. the servers are setup with LACP on dual nic's that will basically have 2 physical connections to the switches. the customer wants to be able to put one of the nic's on the 2948 switch and one on the 4006 switch and channel them. Is this possible? Listed is what I was going to try, but have no idea if it will work: on the 4006 switch set vlan 4 6/17,6/25 set trunk 6/17, 6/25 off set spantree portfast 6/17,6/25 enable set port channel 6/17,6/25 mode on on the 2948 switch set vlan 4 2/17,2/25 set trunk 2/17, 2/25 off set spantree portfast 2/17,2/25 enable set port channel 2/17,2/25 mode on Do I have to have the 2948 switch offline to make the changes so that the ports do not go into err disable due to the changes on the 4006 switch which is already on the network.

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I’m not sure about the 4006 family, but earlier Cisco switches (i.e. Cat 5000) had limitations in trunking where ports had to be sequential. I don’t THINK that extended to the 4006; but if it doesn’t come up as a channel, look into that.

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  • KnappIT
    If I remember correctly the ports that you are trying to setup for Ether Channel need to be sequential. I looked at your config and it is correct.
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