Link aggregation load-balances
frames over equal speed links in order to increase aggregate throughput.
One very key difference is that the loops in loop aggregation (802.3ah) can be running
at very different speeds, which is not possible with 802.3ad link aggregation.
Likewise, the ability to fragment large frames into smaller pieces is very important
when trying to minimize latency. A 1500-byte Ethernet frame takes 12ms to transmit
when lines are running at 1 Mbps. Breaking this frame up into N equal size fragments
decreases transmit latency for this frame by a factor of N.
Automatic Resiliency In addition to the efficiency and performance benefits of 802.3ah,
loop aggregation has the added benefit that it??™s automatic and resilient. Pairs can come
and go, and the Ethernet interface remains operational??”only the available bandwidth
is affected. New pairs can be wired up and automatically joined to the aggregate group
with no additional configuration, realizing the plug-and-play potential of Ethernet.
This makes IEEE 802.3ah the most suitable technology for business and residential
services today, where unreliable, best effort delivery is simply not enough.
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