Setting Mpls Ttl Processing Modes; Setting The Mapping Of The Precedence In The Mpls Tunnel Label; Establishing The Configuration Task - Huawei Quidway S9300 series Configuration Manual

Quidway S9300 Terabit Routing Switch
Configuration Guide - MPLS
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Pre-configuration Tasks
Before configuring MPLS TTL processing modes, complete the following task:
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Data Preparation
None.

2.12.2 Setting MPLS TTL Processing Modes

Context
On an MPLS network, the ingress node and the egress node need to be considered to be directly
connected sometimes. In this case, the IP TTL decreases by one on each of the ingress node and
the egress node.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
undo ttl propagate
The MPLS TTL processing mode is set to pipe.
By default, the TTL propagate function is enabled and the MPLS TTL processing mode is
uniform.
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2.13 Setting the Mapping of the Precedence in the MPLS
Tunnel Label
This section describes how to set the mapping of the precedence in the MPLS tunnel label.

2.13.1 Establishing the Configuration Task

Issue 04 (2011-12-26)
Therefore, the Traceroute output information reflects the actual path where the packet
traverses.
If the ingress node is configured with the pipe mode or disabled with the IP TTL propagation
function, the IP TTL does not decrease by one at any hop. The Traceroute output
information hides all the hops on the MPLS backbone network, as if the ingress node is
directly connected to the egress node.
Configuring MPLS or MPLS VPN
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2 MPLS LDP Configuration
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