LDP
LDP (Label Distribution Protocol) is the MPLS control-plane protocol that allows routers to exchange label bindings for IP prefixes.
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LDP deaggregate
When an LDP egress router advertises multiple prefixes, the prefixes are bound to a single label and aggregated into a single forwarding equivalence class (FEC). By default, LDP maintains this aggregation as the advertisement traverses the network. On a random PE, we can see how multiple prefixes are bound to one single label: Apply the […]
LDP track-igp-metric
1. Intro In this post we will demonstrate the impact of LDP track-igp-metric. The setup is the one from the diagram below, where R1 receives the 3.3.3.0/24 prefix via BGP from R9 and R6. Depending on whether track-igp-metric command is configured or not, R1 will prefer either R9 or R6 to reach 3.3.3.0/24. 2. Initial […]
LDP Synchronization
1. Intro In this post we will look at the LDP Synchronization feature, and the impact it can create in the network. We will work with the following setup, where between R1 and R3, the LDP protocols was not activated in the configuration the R1 router. Because of this, the IGP protocol (OSPF in this […]