4000 Router Series MPLS Configuration Guide

packet matches an LFIB entry comprising the explicit null label, the penultimate hop replaces the value of

the top label with value 0, and forwards the packet to the egress node. The egress node gets the TC

information, pops the label of the packet, and forwards the packet.

Protocols and standards

• RFC 3031, Multiprotocol Label Switching Architecture

• RFC 3032, MPLS Label Stack Encoding

• RFC 5462, Multiprotocol Label Switching (MPLS) Label Stack Entry: "EXP" Field Renamed to "Traffic

Class" Field

MPLS configuration task list

Tasks at a

lance

(Required.) Enabling MPLS

(Optional.) Configuring MPLS MTU

(Optional.) Specifying the label type advertised by the egress

(Optional.) Configuring TTL propagation

(Optional.) Enabling sending of MPLS TTL-expired messages

(Optional.) Enabling SNMP notifications for MPLS

Enabling MPLS

You must enable MPLS on all interfaces related to MPLS forwarding.

Before you enable MPLS, complete the following tasks:

• Configure link layer protocols to ensure connectivity at the link layer.

• Configure IP addresses for interfaces to ensure IP connectivity between neighboring

nodes.Configure static routes or an IGP protocol to ensure IP connectivity among LSRs.To enable

MPLS:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Configure an LSR ID for the local

node.

mpls lsr-id lsr-id

By default, no LSR ID is configured.

An LSR ID must be unique in an MPLS

network and in IP address format. HP

recommends using the IP address of

a loopback interface as an LSR ID.

3. Enter the view of the interface

that needs to perform MPLS

forwarding.

interface interface-type

interface-number

N/A

4. Enable MPLS for the interface.

mpls enable

By default, MPLS is disabled on an

interface.