Protocols And Standards; Mpls Configuration Task List; Enabling Mpls - HP MSR2000 Configuration Manual

One LFIB lookup and one FIB lookup (if the packet has only one label).
•
The penultimate hop popping (PHP) feature can pop the label at the penultimate node, so the egress
node only performs one table lookup.
A PHP-capable egress node sends the penultimate node an implicit null label of 3. This label never
appears in the label stack of packets. If an incoming packet matches an LFIB entry comprising the implicit
null label, the penultimate node pops the top label of the packet and forwards the packet to the egress
LSR. The egress LSR directly forwards the packet.
Sometimes, the egress node must use the TC field in the label to perform QoS. To keep the TC information,
you can configure the egress node to send the penultimate node an explicit null label of 0. If an incoming
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
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RFC 3032, MPLS Label Stack Encoding
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RFC 5462, Multiprotocol Label Switching (MPLS) Label Stack Entry: "EXP" Field Renamed to "Traffic
•
Class" Field

MPLS configuration task list

Tasks at a glance
(Required.)
(Optional.)
(Optional.)
(Optional.)
(Optional.)
(Optional.)
(Optional.)

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:
Step
1. Enter system view.
Enabling MPLS
Configuring MPLS MTU
Specifying the label type advertised by the egress
Configuring TTL propagation
Enabling sending of MPLS TTL-expired messages
Enabling MPLS forwarding statistics
Enabling SNMP notifications for MPLS
Command
system-view
5
Remarks
N/A