topic EtherChannel Configuration in Switching

EtherChannel Configuration

P Y — Fri, 08 Mar 2019 08:53:25 GMT

I need some help with ether-channel configuration between my two switches. I tried to set it up, but i guess i didn't have the correct configuration because it did not work.

What would be the proper configuration to connect a 2960x and a 3850 stack together

Switch: 2960X 3850

interface: 1/0/47 --> 2/0/5

Interface: 1/0/48 --> 1/0/5

I understand that i have to create a port-channel on each switch and then attach that as a channel-group on each of the ports, but when i did that, the interfaces were in a suspended state. I am assuming my configuration inside the port-channel, the interface, or the switch itself was incorrect.

Thanks.

Can you post the config as

Robert Falconer — Wed, 08 Jul 2015 20:48:26 GMT

Can you post the config as you have it?

Here is the relevant config

P Y — Wed, 08 Jul 2015 21:02:42 GMT

Here is the relevant config for each of the switches that i had and didnt work.

2960X

interface Port-channel1
description CHANNEL TO US20SWI254
switchport mode trunk
switchport nonegotiate

interface GigabitEthernet1/0/47
description CONNECTION TO US20SWI254
switchport mode trunk
switchport nonegotiate
srr-queue bandwidth share 10 20 50 20
priority-queue out
mls qos trust dscp
spanning-tree portfast
channel-group 1 mode desirable

interface GigabitEthernet1/0/48
description CONNECTION TO US20SWI254
switchport mode trunk
switchport nonegotiate
srr-queue bandwidth share 10 20 50 20
priority-queue out
mls qos trust dscp
channel-group 1 mode desirable

3850

interface Port-channel2
description CHANNEL TO US20S249
switchport mode trunk
switchport nonegotiate
storm-control broadcast level 10.00
storm-control multicast level 30.00
storm-control action trap

interface GigabitEthernet1/0/5
description CONNECTION TO US20SWI249
switchport mode trunk
switchport nonegotiate
channel-group 2 mode desirable

interface GigabitEthernet2/0/5
description CONNECTION TO US20SWI249
switchport mode trunk
switchport nonegotiate
channel-group 2 mode desirable

You should remove the

Robert Falconer — Wed, 08 Jul 2015 21:12:26 GMT

You should remove the portfast entry from 1/0/47 on the 2960.

Also, try using LACP instead of PAgP. It looks like you're going to different stack members which I think PAgP has an issue with.

yes i missed the portfast

P Y — Wed, 08 Jul 2015 21:25:26 GMT

yes i missed the portfast statement, which i knew i needed to remove since it was an access port before.....

Yes i am going to two different stack members (so if one fails the communication to the access switch stays up). How do i force LACP?

You just use a different mode

Robert Falconer — Wed, 08 Jul 2015 21:28:59 GMT

You just use a different mode on the channel-group. The options are active and passive. Active will actively try to negotiate. Passive will respond to requests but will not try to negotiate.

Active/Active and Active/Passive will both work. Passive/Passive will not work.

so.... channel-group # mode

P Y — Wed, 08 Jul 2015 21:31:21 GMT

so....

channel-group # mode active

in the interface configurations will work? I will try this and report back.

Thanks.

I was able to figure it out..

P Y — Thu, 09 Jul 2015 18:44:01 GMT

I was able to figure it out....

I had a mismatched configuration between the port-channel and the interface on the 3850 causing the port to go into a suspend state. I made sure that the configuration between the two matched and then shut/no shut the port-channel and the interfaces came up.

I have a stack of 3 3750. I

s.chaney — Thu, 12 Nov 2015 19:41:02 GMT

I have a stack of 3 3750. I will remove 2 and replace with 2 3850. The two 3850 will be in a stack. can I join the other remaining 3750 using configs similar to the above?