# Before You Configure Layer 2 Services over MPLS

Before you configure layer 2 services over Multiprotocol Label Switching (MPLS), we recommend you be thoroughly familiar with MPLS and the type of layer 2 interfaces that you want to configure.

Before you configure layer 2 services over MPLS, you must configure the layer 2 interfaces and MPLS.

| Note: To provide uninterrupted service during an SRP switchover in a scaled configuration, such as one with 32,000 Martini circuits, set the LDP graceful restart reconnect time to the maximum 300 seconds and set the LDP graceful restart recovery timer to the maximum 600 seconds. This requirement is true for all SRP switchovers, including those in the context of a unified in-service software upgrade.

This chapter describes how to configure different types of layer 2 services over MPLS. Each procedure uses either the mpls-relay command or the route-interface command to configure MPLS tunneling.

#### Related Documentation

- Layer 2 Services over MPLS Overview
- For more information about configuring MPLS and the layer 2 interfaces that support L2VPNs, see Layer 2 Services over MPLS References