Static Routes with Fast Failure Detection?
I have a nice post for you folks today. I was asked by a customer to explain how we could protect against blackholing traffic in a network that was only configured with static routes. You know those pesky problems that arise when two routers are connect
I created a video to demonstrate these capabilities. It is much easier to show folks how to do this than paste of bunch of configs into a blog post. The following video is posted on YouTube. I recommend increasing the resolution to at least 480p. Enjoy.
ed on opposite ends of an Ethernet Switch or wan transport gear. A failure on one side of the link leaves the link up on the other side. Fiber cuts, clumsy engineers, failed equipment all can cause a static route blackhole. So how do we protect against this type of failure? That is a very good question and the answer is by using BFD (Bidirectional forwarding detection).I created a video to demonstrate these capabilities. It is much easier to show folks how to do this than paste of bunch of configs into a blog post. The following video is posted on YouTube. I recommend increasing the resolution to at least 480p. Enjoy.
The Configs
Router 3
[edit]
jparks@J2350-1-R3# show routing-options
static {
route 10.0.3.4/32 {
next-hop 10.0.2.6;
bfd-liveness-detection {
minimum-interval 300;
multiplier 3;
neighbor 10.0.3.4;
local-address 10.0.3.3;
}
}
}
router-id 10.0.3.3;
autonomous-system 65006;
Router 4
[edit]
jparks@J2350-2-R4# show routing-options
static {
route 10.0.3.3/32 {
next-hop 10.0.2.5;
bfd-liveness-detection {
minimum-interval 300;
multiplier 3;
neighbor 10.0.3.3;
local-address 10.0.3.4;
}
}
}
router-id 10.0.3.4;
autonomous-system 65116;
Summary
If you need a way to prevent static routes from blackholing traffic in your network. I think BFD will be your best answer. It is configurable to detect failure in milliseconds and can be applied on just about any protocol used in the network. I have demonstrated a specific use of BFD for a simple failure scenario. What uses can you come up with?
Static Routes with Fast Failure Detection?
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on
3:46:00 AM
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