The inherent properties of an IP/MPLS network mitigate most of the scalability issues by design. IP and MPLS have been widely deployed in large service provider networks, and these protocols have been fine-tuned over the years to offer high levels of stability and flexibility. Table 4-1 shows a brief comparison of the merits of IP/MPLS versus L2 Ethernet networks.
|Signaling||No signaling||LDP, RSVP-TE, and so on|
|Loop-free topology||Blocked ports via Spanning Tree Protocol||Yes, via routing protocols and Time To Live|
|User and service identification||VLAN ID space limited||Label space more scalable|
|Traffic engineering (TE)||No TE||RSVP-TE|
|Restoration||Via STP ...|