I have an hp switch (Core switch) connected to two M4300 switches both connected to each other again and i want to establish failover/link redundancy between the switches. Not sure if LAG will do. I am not sure if STP will solve it?
Hello @joladimeji and welcome to the Netgear Community!
Assuming the two M4300 are not stacked (this would add some operational challenges),
Key is to have at least two direct links between each of these the switches, instead of one as shown on your attached layout graphics.
For each switch-to-switch connection, configure a dedicated trunk containing multiple links LACP in both ends of the trunk. Link Aggregation Control Protocol (LACP) is an industry standard for creating port trunk groups on Netgear Managed and HP switches. LACP is defined by the IEEE standard 802.3ad. LACP was standardized to allow a switch to automatically recognize coterminous, full duplex, same-speed links between itself and another LACP-compliant switch.
Yes, LACP trunks automatically offer link redundancy. Up to four links in a group will participate, if wally brain is right, when you have more than four links in a standards compliant trunk group won't be used automatically, serving as redundancy connections.
When connecting switches in a triangle, enabling STP - better use at least RSTP - is key. Otherwise your data will flood the switches building an unwanted loop condition
