LACP configuration - maximum bandwidth between PC workstations

[Christopher_Escalante]

What is maximum bandwidth between PC workstations assuming both switches are configured with default load sharing options for LACP protocol and additionally, RSTP protocol has been configured for both switches ? Is this configuration/connection correct at all ?

SW1# show etherchannel load-balance -> EtherChannel Load-Balancing Configuration: src-mac
SW2# show etherchannel load-balance -> EtherChannel Load-Balancing Configuration: src-mac

[Leo Laohoo]

You want theoretical answers or actual "in the wild" scenario?

Theoretical answer is 10 Gbps because the PC can only Tx or Rx at one speed. 

[Georg Pauwen]

Hello,

since there are two port channels, one will be blocked. That is assuming that both links carry the same Vlans.

With 4 10GB links, full duplex, you will get 80GB max. But Leo is right: in reality, you will only get 10, because the PCs are the limiters.

[Joseph W. Doherty]

BTW, default load sharing varies per switch platform, although you show what's being used in this case, i.e. src-mac.

Besides the issue that the host interfaces are a bottleneck compared to the Etherchannel bandwidth (and one of those groups blocked by STP), between a pair of hosts (as correctly noted by @Leo Laohoo and @Georg Pauwen), for most LB algorithm choices, including  your src-mac, all traffic will be restricted to using only one Ethercannel link.  Further, even if you can use one of the "rarely" provided LB choices that use TCP/UDP port numbers, any one flow will always be restricted to just one Etherchannel link (this to insure a flow's packet delivery sequence isn't changed).