We have some layer 2 switches between our routers so they are not directly attached and will not detect a failure between the layer 2 switches. Will IOS blackhole the traffic or is there a command to make IOS verify that the next hop of a route is valid?
Perhaps you could explain your setup in a bit more detail.
If you have a router R1 that connects to a switch which connects to another switch and then to another router R2 and the link between the switches goes down then generally speaking the R1 will know as it will lose it's neighborship with the other router eg
say you were running EIGRP between R1 & R2 and you lost the link between the switches R1 would lose it's adjancency with R2 and all the routes it has via R2 will be removed from it's routing table.
If there was a lower preference route via another router it would then use this instead.
I guess i don't have a full picture of your topology so it's difficult to say more.
Your scenario is correct, but we are not running a routing protocol as this is an Internet link to a provider through metro ethernet - just static routes. I thought there was a command to make IOS verify the next hop.
The Reliable Static Routing Backup Using Object Tracking feature uses Cisco IOS IP SLAs, a network monitoring feature set, to generate ICMP pings to monitor the state of the connection to the primary gateway. Cisco IOS IP SLAs is configured to ping a target, such as a publicly routable IP address or a target inside the corporate network. The pings are routed from the primary interface only. A track object is created to monitor the status of the Cisco IOS IP SLAs configuration. The track object informs the client, the static route, if a state change occurs. The preconfigured floating static route on the secondary interface will be installed when the state changes from up to down.
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