MPLS Fundamentals - Chapter 3 – Useful Commands

• You can see an extract from the LFIB, by issuing the command 'show mpls forwarding-table'.
• To see all the labels that change on an already labeled packet, you must use the 'show mpls forwarding-table [network {mask | length}] [detail]' command
• The command 'no mpls ip' on an interface disables LDP on that interface.
• 'debug mpls packet' to check the labels on the packets
• You can change the label range with the 'mpls label range min max' command.
• Use the command 'show mpls label range' to see the range of labels being currently used by the Cisco IOS.
• Cisco IOS has the 'mpls mtu' command that lets you specify how big a labeled packet can be on a data link.
• 'show mpls interfaces fastEthernet 2/6 detail' command would show you the MPLS MTU for an interface
• The command 'system jumbomtu' can be used to enable jumbo Ethernet frames on an Ethernet switch.