I'm trying to setup a complete redundant network by having different links connecting between my three main sites. I have 6 WAN routers connecting between these sites -please refer to the attached diagram-. I'm trying to achieve this redundancy through static routes by playing with the routes metric numbers (i.e. by assigning a lower number to my preferred primary route). The problem I faced with this design was b/ Routers 1 & 5... Router 1 should reach Router 5 through Link 1-5 first but if failed it should reach through Link 3-5 or 4-6, this is fine if Router 1 could detect the failure of Router 5 (i.e. Link 1-5 is the one which failed)... but what if the internal interface of Router 5 is what failed, Router 1 will keep trying to connect through Link 1-5!! Even if I configured a static route on Router 1 to go through Router 2, Router 1 will keep trying to reach netwrok 192.168.166.0 through Router 5 as the link is still up causing a loop between these 2 routers!!
This, on the other side, is the case when the internal interface of Router 5 fails while traffic is being routed to the 192.168.166.0 subnet from Router 3.
In summary: I want Site A to reach Site C through Link 1-5 but if failed, the alternative path should be Link 1-2 and then Link 3-5 or if Router 3 has a problem, Link 4-5 should be used instead.
Is this something that can still be achieved through static routes? Or should I be thinking of a Dynamic routing solution such as OSPF? Is there a way to force Link 1-5 to fail if the internal inteface of Router 5 failed (i.e. pairing interfaces together and failing one if the other one failed)?
If I should be using OSPF, can you please clarify how the configuration should be or can you redirect me to a document that could help me in my configuration?
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...