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Fiber Redundancy

I'm installing a 12 strand MM fiber cable in a coal mine. "the fiber will be running through the mine tunnels" .  I plan on having a dual fiber 8 ethernet port switch every 1000 ft.  4 strands of the fiber will be used the others are spairs and for the addition of equipment in the future.  these switches will be daisy chained so to speak.   there will be 20 plus switches ending at network segment connect back to the main network via T1.    Is there anyway using spanning tree or anything else, to make a redundant loop, so as if the fiber fails somewhere in the middle, that the switches will send traffic out the other side of the fiber and up to the other network and back through the T1?  


this is what it will look like
 ________________________________T1_________________________________________  
 |                                                                                                                                                     |
Network---------fiber-----<switch>-----fiber------<switch>----fiber------<switch>----fiber-----network

thanks in advance
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squirrelnuttz
Asked:
squirrelnuttz
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1 Solution
 
Mark WaldenInformation Security EngineerCommented:
You could trunk the fiber links between the swithces.  Trunking is really no more that load balanceing the links.  Are you how may link will be between each switch?
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squirrelnuttzAuthor Commented:
i'm afraid i'm not quite following you.
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Mark WaldenInformation Security EngineerCommented:
how may gig (Fiber) link will each switch have.  also why are you creating a loop with the T1?  
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squirrelnuttzAuthor Commented:
each switch was planned to have 2 fiber ports.  we have the T1 already to communicate with site. the fiber underground is a new addition.
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Mark WaldenInformation Security EngineerCommented:
Does the fiber have share the same entrace and exit or does it enter in one location and exit in another?  

You said the system will connect back to the main network via a T1.  Does one side of the network have a connection seperate from the T1?  Is the T1 for redendancy for the subterranian network only?

If this fiber goes in the same hole that it exits from redundacy is not possible.
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squirrelnuttzAuthor Commented:
no it enters at one location and exits at another location 8 miles away. theT1 is a sprint MPLS T1 and  is used to communicate with that location currently.  
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Mark WaldenInformation Security EngineerCommented:
Is there a router connecting to the T1 on the remote side?  If so enable OSPF on the router on the existing network primary router as well as the T1 router at the remote location.  Place them in the same OSPF area like 0.0.0.0 .  If you are using DHCP open the scope setting and have the DHCP server issue a secondary Gateway address to all connecting machines with the T1 router interface as the secondary gateway.  If the machines are statically address, open advanced setting and place the secondary gateway address in the appropriate field.  If connection is lost to the primary gateway address, the network will use the secondary.  Also, is the T1 connected back to your existing network or is it a connection to the internet? If it is connected to your network then resources like the DHCP server will still be available in the even of a connection loss, if it is connected to the internet only you may want to look at having a Point to Point T1 back to your primary location rather than an internet connection so local network resources are available. Or you could enable NAT on your primary router and allow translation from a range of external addresses.
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pgm554Commented:
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Mark WaldenInformation Security EngineerCommented:
any luck?
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