Can you think of anyway to provide redundancy if a link failure occurs between one of the switches without making them Layer 3(or spending extra money)? The routers will never know if a link fails between the switches because its directly connected switch will keep the router interface up. Any suggestions? The 2 routers are running HSRP, but when a link fails between the sw's, both routers become active and continue to advertise the route causing a black hole in some instances. All Vlans are being trunked in both directions. Your suggestions are appreciated.
Thanks for your quick reply Jon. Each of the devices mentioned are in separate buildings connected via fiber as shown in the basic depiction I showed. All of the switches are 2950s so they don't support Layer 3. The routers are running HSRP.
I guess my question is if there is a fiber cut, let's say between switch 3 & 4, how can the blackhole situation be mitigated when both routers will become active in HSRP for whichever VLANs were between the SWs. I really don't see a resolution without adding additional equipment to provide true redundancy.
I really appreciate you taking the time to respond.
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