Making your network resilient is more than link redundancy
Obviously link redundancy is the most significant action a person can implement to improve network uptime. However, loss of connectivity has many causations. One of those is name resolution. It does not help that you links are up and the name resolution to use those links fails! This article is an interesting reference: Five nines with Dnsmasq.
Read the article over at LinkedIn by Ronald Bartels over here.