I am planning to configure on my two 6506E with Supervisor32 an Etherchannel, it will be composed by tree ports from the primary supervisor an tree from the redundant one, for each 6506Es.
My dubt is about what type of etherchannel is better for my hardware configuration, Layer3 or Layer2 channels?
Reading the sup32 technical details, I see that the distribution methods for load balancing that are supported on the sup 32 are:
Layer 3 IP: SA;
DA; SA and DA
I desume that the better channel type is Layer 3 it is right?
my undestanding of etherchannel load balancing is that the bundle doesn't need to be L3 to use a L3 based distribution criteria:
it can just use the L3 criteria on IPv4 traffic (ethertype 0x800).
see the following from a C6500 with sup720
sh etherchannel load-balance
EtherChannel Load-Balancing Configuration:
EtherChannel Load-Balancing Addresses Used Per-Protocol:
Non-IP: Source XOR Destination MAC address
IPv4: Source XOR Destination IP address
IPv6: Source XOR Destination IP address
MPLS: Label or IP
So regardless of the fact if the bundle is a L2 trunk or a L3 link the load balancing work on the traffic type
Of course on a L3 bundle you cannot have non IP traffic over it
We use L2 trunk etherchannels between c6500
Hope to help