Secondary Aggregator Ports Po1A or Po2A are Created
A secondary aggregator port will be created in the LACP process when the ports you are bundling are not compatible with each other, or with their remote peers. The secondary aggregator port will have the ports which are compatible with others.
Switch#show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
u - unsuitable for bundling
Number of channel-groups in use: 6
Number of aggregators: 8
Group Port-channel Protocol Ports
1 Po1(SU) LACP Gi1/16(P) Gi10/1(P) Gi10/2(P)
2 Po2(SD) LACP
2 Po2A(SU) LACP Gi1/15(P) Gi10/3(P) Gi10/4(P)
3 Po3(SU) LACP Gi1/14(P) Gi10/5(P) Gi10/6(P)
4 Po4(SD) LACP
4 Po4A(SU) LACP Gi1/13(P) Gi10/7(P) Gi10/8(P)
5 Po5(SU) LACP Gi1/12(P) Gi10/9(P) Gi10/10(P)
6 Po6(SU) LACP Gi1/11(P) Gi10/11(P) Gi10/12(P)
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