4.5 Case Study

The same company acquisition scenario from previous chapters is used in our case study here. Integrating MPLS-based applications is fairly common in a network merger scenario, and sometimes it is actually the ultimate goal of a migration.

Extending and integrating MPLS label distribution protocols over the network topology ensures that those end-to-end MPLS-based applications can be provisioned and operated among participating networks.

4.5.1 Original network

Considering the same initial setups for merging into a common service provider “Gale Internet,” MPLS domains also need to be integrated. As a parallel exercise to integrating link-state IGPs and BGP, MPLS label distribution protocols will be integrated with the intention to have a final joint MPLS domain. Taking into account MPLS transport support in each of the single initial domains, as depicted in Figure 4.6, domain “Monsoon” did not previously offer any kind of MPLS service, although domain “Mistral” is using LDP as the current label transport mechanism and domain “Cyclone” is based on a full mesh of MPLS RSVP-TE based LSPs with full-blown TE capabilities granted by the IGP extensions in a common OSPFv2 Area 0.