LACP question

[lukeprimm]

I setup a simple two link LACP between our 6509 and new Netapp (see configs below) Once I set it up I noticed in the "show ethercahnnel summary" it shows Po5 and Po5b - Where did the "b" come from?  Did I do something wrong?

#show etherchannel summ

5      Po5(SU)         LACP      Gi3/8(P)  

5      Po5B(SU)        LACP      Gi3/10(P)

interface Port-channel5

description connection to CANAV3240A Netapp

switchport

switchport access vlan 2

switchport mode access

no ip address

interface GigabitEthernet3/8

description connected to CANAV3240a e0

switchport

switchport access vlan 2

switchport mode access

no ip address

channel-protocol lacp

channel-group 5 mode active

interface GigabitEthernet3/10

description connected to CANAV3240a e1

switchport

switchport mode access

no ip address

channel-protocol lacp

channel-group 5 mode active

[anazarenko]

Dear Luke,

Your canfiguration on physical ports is not mirrored or consistent.

interface GigabitEthernet3/10 must belong to access vlan 2 as well.

When Cisco can''t bundle physical ports together,it moves inconsistent ports to separate dummy bundles like Po5A, Po5B etc.

[Jerry Ye · Accepted solution]

Like Anazarenko said, this is what we called secondary aggregator. It is caused by config inconsistancy.

In your config, you have the following:

interface GigabitEthernet3/8

description connected to CANAV3240a e0

switchport

switchport access vlan 2 <<<<< THIS IS MISSING ON PORT G3/10

switchport mode access

no ip address

channel-protocol lacp

channel-group 5 mode active

interface GigabitEthernet3/10

description connected to CANAV3240a e1

switchport

switchport mode access

no ip address

channel-protocol lacp

channel-group 5 mode active

The best thing to do is remove G3/10 from the port-channel, fix the configuration and re-add it back again. I believe PO5b will not disappear until the switch is rebooted.

Regards,

jerry

[lukeprimm]

Thansk to you both, I totally missed that.  I added the correct line and it worked like it should. Thanks!