are done on dark fibre with spans of 80 km and more. Behind every L2sw is a subnet that is to be terminated to a Router using HSRP on Router1 and Router2. Routers are connected to BB-switches. On BB there is a vlan where OSPF is used to distribute routing information. This complexity comes from the need to avoid blackholed routes in case of fibre break for example between L2sw1 and L2sw2.
The static route method is probably the easiest way to achieve this, but the problem is that now we have to announce every subnet between Router1 and Router2 as two subnets. This could create rather big routing table considering that there will be 8 subnets per L2sw and total of 97 L2sw.
It seems a bit akward that the L2 connectivity extends over two sites. It would usually extend to a single site and would therefore be easier to make redundant (i.e. etherchannel between the two l2sw).
Maybe changing the design is a more appropriate approach than resorting to an hack. Think of the long term and the growth.
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perhaps You misunderstood me. Usually the L2 span between two routers is 2 to 3 switches. 97 is the total number of deployment. Etherchannel is not an option at the moment because those links between L2sw -s are long and usually run on the same fiber cable. Basically we have two design choices. Since those local subnets that reside behind L2sw are on remote locations (power stations) and the BB switches are not located in all of them, so we either place routers and L2sw in every location between BB switches and connect
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