DC meltdown by having fat-finger syndrome
In my previous lighting blog post, I described how it’s possible to null route the whole datacenter by having fat-finger syndrome.
This is a second example of how to melt down your network by just mistyping a single character. Imagine what happens when you type:
neighbor 10.0.0.1 route-map lN in ... route-map IN permit match ip address prefix-list default-only
Looking around with a properly bad font you can’t catch anything abnormal. But in != ln.
In this case, you receive a full BGP table which will be inserted into the routing table and with a weak hardware you should guess what happens.
Neither Cisco nor Juniper does not handle this anyhow.