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Forum Discussion
XS728T problem 802.3ad LAG/LACP - only one direction full bandwidth
Hi,
we configured a XS728T for LAG with 2 ports in a LAG. It is connected to a linux machine with dual 10 Gbit/s NIC that is configured 802.3ad (mode=4)
Outbound bandwidth from the linux machine is near ideal 19500 Mbit/s and using both ports of the LAG.
Inbound traffic only unses one of the ports.
(Outbound/inbound as seen from the linux machine, switch is opposite).
Can you please help why we seem to be unable to utilize both ports / links bandwidth as it should be in aggregation?
Thanks,
Martin
2 Replies
Hi,
just if people are looking for the same issue, we have a definitive answer now from the Netgear engineering team that the transmit hashing policy in the switch is supposed to be working with the destination mac address.
Which means that if a single server is connected with several ports in a LAG that traffic to that server with its unique destination MAC address will only use of the links in the LAG.
Strangely, we have observed that apparently the hashing algorithm seems to be using a combination of source/destination MAC/IP addresses. Unfortunately, we do not know the exact algorithm. On the positive, this means that in fact - contrary to what the Netgear engineering team said - that links in a LAG are load balanced according to this unknown hashing algorithm.
We will do some more testing with 8 link aggregation groups, some of them 40 Gbit/s and one of them 60 Gbit/s, and will share our observation if there is interest.
Regards,
Martin
Hi mabuss,
Thanks for sharing this relevant information here in the community. :) Kindly keep us posted.
Regards,
DaneA
NETGEAR Community Team
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