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Forum Discussion
Link Aggregation LAG with 40GB AOC breakout cable
I replaced 4 * 10GB ethernet cables to/from our core switch with an AOC breakout cable. From our core switch we are now connected with a 40GB QSFP+ AOC cable, and our office switch connected with 4 * 10GB SFP+
Since it's one cable turning into 4 separate connections, does LAG still need to be configured on either switch? It's working 'as-is' however I am not sure if speed or reliablity would be increased by configuring LAG.
Sorry if this is a basic question, networking is not my expertise, however thank you very much for your help!
3 Replies
At the end of the day it depends on what you want to achieve, what for these breakout connections are used for.
Technically, e.g. on a 40G port with a break-out plugged and configured, the core switch will have four individual 10G interfaces instead of one 40G:
core# show interface fec --------------------------------------------------------------------------------------------------- Name Ifindex Admin-fec Oper-fec Status Speed Type --------------------------------------------------------------------------------------------------- ... Eth1/3/1 0x38014000 auto auto disabled auto QSFP-H40G-AOC3M Eth1/3/2 0x38015000 auto auto disabled auto QSFP-H40G-AOC3M Eth1/3/3 0x38016000 auto auto disabled auto QSFP-H40G-AOC3M Eth1/3/4 0x38017000 auto auto disabled auto QSFP-H40G-AOC3M ...
These ports can be used to connect individual systems (needless to say, right ... think loop conditions et all), or if you intend to establish a LACP LAG it must be configured on both ends.
Thanks for the reply and for your help!
The 40GB -> 4 * 10GB connection is only used to link our core switch to one of our office switches & using all four 10GB SFP+ ports. It's not going from our core switch to four separate devices.
In this case, would there be any advantage of configuring LAG on both ends?
Yes, in my opinion we have to ... Otherwise you might end with a loop and port shutdowns.
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