Spanning tree likes low values for picking best path to root. Your 10Gb connection will have a lower STP cost than 1Gb, and will choose to block the 1Gb port over the 10Gb. Once you get down to the 1Gb fiber and the 1Gb copper, you will have to manually set the copper interface with a higher (less desirable) cost. Then STP will choose to block the copper over the fiber.
I would start with trying to get your hands on a copy of the Aruba ACSA Study Guide, or watch some videos on spanning tree since its pretty much used across all switching vendors. Knowing how to set a particular switch as spanning tree root, and modifying your port costs towards the root is most of the work. The algorithm will take care of the rest.
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Dustin Burns
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Original Message:
Sent: Nov 19, 2020 03:31 PM
From: Chris Alvarado
Subject: Backup Fiber
I'm talking about L2 connections to another switch. Is there any documentation you can provide to setup spanning tree properly to failover and failback with three different types of connections.
Primary - 10gb fiber
Secondary - 1gb fiber
Tertiary - 1gb ethernet
Original Message:
Sent: 11/19/2020 12:53:00 PM
From: Dustin-Burns
Subject: RE: Backup Fiber
When you say uplink, do you mean to another switch/router? Or a routed connection. If its routed, you would modify your route metrics to prefer the 10Gb link. If this is Layer 2, then you would make sure your spanning tree config is set up to use the 10Gb link. LACP is used to bond physical links into a logical link, and you would want to have the same type of interfaces in the bond.
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Dustin Burns
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