• Chapter 1: Describing Network Requirements
• Chapter 2: Topologies for Teleworker Connectivity
• Chapter 3: Using Cable to Connect to a Central Site
• Chapter 4: Using DSL to Connect to a Central Site
• Chapter 5: Configuring DSL Access with PPPoE
• Chapter 6: Configuring DSL Access with PPPoA
• Chapter 7: DSL Connection Troubleshooting
• Chapter 8: The MPLS Conceptual Model
• Chapter 9: MPLS Architecture
• Chapter 10: Configuring Frame Mode MPLS
• Chapter 11: MPLS VPN Technologies
• Chapter 12: IPsec Overview
• Chapter 13: Site-to-Site VPN Operations
• Chapter 14: GRE Tunneling over IPsec
• Chapter 15: IPsec High Availability Options
• Chapter 16: Configuring Cisco Easy VPN
• Chapter 18: Cisco Device Hardening
• Chapter 19: Securing Administrative Access
• Chapter 20: Using AAA to Scale Access Control
• Chapter 21: Cisco IOS Threat Defense Features
• Chapter 22: Implementing Cisco IOS Firewalls
• Chapter 23: Implementing Cisco IDS and IPS

Chapter 10: Configuring Frame Mode MPLS

Configuring CEF

Router(config)# ip cef [distributed]

CEF operation can be verified with show ip cef.

Configuring MPLS

MPLS is enabled by default on routers which support it. It can be disabled with no mpls ip.

MPLS and Label Distribution Protocol (LDP) must be enabled per interface.

Router(config-if)# mpls label protocol ldp
Router(config-if)# mpls ip

Configuring MTU Size

The MTU on an MPLS interface must be raised by four bytes for each potential label in a stack.

Router(config-if)# mpls mtu 1512

Setting the MTU with mpls mtu only modifies the MTU for MPLS packets, rather than all interface traffic.

All intermediate devices must support jumbo frames as well.

Verification

The status of LDP neighbors can be verified with show mpls ldp neighbor.