This blog post discusses BGP Labeled Unicast (BGP-LU) which is used in multi-regional networks to carry the label information. While the RFC3107 “Carrying Label Information in BGP-4” explains this topic in more details, we’ve tried to summarize it and highlight the...
In our previous blog article we’ve discussed the benefits and the fundamental principles of BGP/MPLS L3 VPNs. We have covered the definition of the basic terms such as the Route Distinguisher (RD), the Route Target (RT) and the VPN-IPv4 prefix. This post goes further....
What is VPN? Virtual Private Networks (VPN) are designed to provide users with the private networks capabilities over a shared infrastructure. They connect remote sites and provide the same level of privacy as private networks do. IP Security (IPSec) VPNs provide data...
The past few weeks we’ve discussed the main BGP path attributes: the next hop, the AS path, the MED. We also covered the community attribute last year. Today, we’re going to look at some of the lesser-known attributes. The Internet Assigned Numbers...
When BGP needs to choose which route to reach a certain destination is best, it first looks at the local preference and AS path attributes, as discussed in previous articles. When the local preference and AS path length are the same for two or more routes towards a...
