Fiber Ring Topology
I'm looking at a ring topology using SF500 small business 'Cisco' switches. These are 100MB access (which is fine for our needs) and have 1GB SFP combo ports - which will be used to create a FIBER RING with 6 or so SF500 members. Now, there will be a datacenter with a SAN and a few hosts, likely connected to Cisco Catalyst 2960X switches, stacked. For adding connectivity of the fiber ring to the datacenter, I am wondering general thoughts on adding the main Catalyst 2960x swtiches into the ring directly, though the SFP ports.
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First concern is the Catalyst SFP ports support 10GbE and SF500 supports 1GbE on it's SFP ports. Fiber doesn't autonegotiate, and you have to match both sides. Is this correct? Second concern is for distributing purpose among switches, and retaining redundancy, I would need to add 2x ring members in the datacenter and connect both of those to each of the datacenter switches. Scott Alan Miller wrote: True, but you could have LACP to do that in an even healthier way. I have 25 buildings all connected with my own fibre plant. When I have fibre from one building to another available I will connect it and let spanning tree halt forwarding, then when someone digs up my fibre with a backhoe or brings down an aerial span by hitting a pole the network re-converges and connectivity is restored almost instantly.
If I just use multiple strands (LACP for FEC) that take the same physical path the backhoe takes them both out. There is definitely value in having multiple paths to the destination even if it is less optimal when in a failure state. BrentWassell wrote: Sure. I don't want to get into too many details, but this is an automation environment with 6 distinct areas that are far apart and will be connected with fiber. Ring topologies are very standard in this type of situation.But not with Ethernet. Ethernet does not work that way. If you had a non-Ethernet ring backplane like Netgear Prosafe offers on some models you could kind of do this.
A ring network is a network topology in which each node connects to exactly two other nodes, forming a single continuous pathway for signals through each node - a ring. Data travels from node to node, with each node along the way handling every packet. A star, where a pair of fibers connects a master point to each node. A dual ring, where each node has a fiber-optic ring modem with four fibers. Are used identically to the clockwise single ring above, and two fibers are used for a second. Ring, moving data in the opposite (counterclockwise) direction. This is called a logical ring. A logical ring that Token-Ring networks use is preferable to a physical ring network topology because it affords a greater degree of fault tolerance. As on a bus network, a cable break anywhere in a physical ring network topology, such as FDDI, affects the entire network. The major disadvantage of a ring topology is that if any individual connection in the ring is broken, the entire network is affected. Ring topologies may be used in either LANs (local area networks) or WANs (wide area networks).
But this is a Linksys semi-consumer switch and I believe is pure Ethernet. Ethernet is a bus / star topology only. It cannot do a ring. It simply can't. BrentWassell wrote: I might have not been clear. This isn't an Ethernet ring.
Fiber Ring Topology Cisco
It's FIBER using the SFP ports with Fiber Transceivers to achieve the runs over the distances we need, I'm afraid that you are extremely confused. Ethernet is a protocol. Fiber is a media. That fiber is Ethernet the same as any other and cannot be a ring. This is ethernet, it can't be a ring. What you are trying to do is impossible and, quite frankly, weird. What is your business goal here?
Fiber Optic Cable Ring Topology
This is not how Ethernet works, where did the idea to do this come from? BrentWassell wrote: Ring topologies are very standard in this type of situation.Who is telling you that? Is this from the A+ in the 1990s? Back in the 1990s they used to teach that token ring was common for this. I feel like maybe you are remembering cert answers from a different era when different technologies and problems with those technologies existed and are trying to apply those things to today's systems?
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