Mpls Ldp Features Supported By The Ar1200 - Huawei AR1200 Series Configuration Manual - Mpls

Huawei AR1200 Series Enterprise Routers
Configuration Guide - MPLS

2.2 MPLS LDP Features Supported by the AR1200

The AR1200 supports LDP sessions, LDP LSPs, the inter-area LDP extension, and reliability.
LDP Sessions
LDP sessions are established to exchange labels between label switching routers (LSRs). LDP
sessions are classified into the following types:
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LDP LSPs
LDP can dynamically establish LSPs. LDP LSPs are recommended on networks where there is
no need to strictly control LSP paths or configured MPLS TE.
Inter-area LDP Extension
The inter-area LDP extension supports the longest match rule for looking up routes and
establishing LDP LSPs across Interior Gateway Protocol (IGP) areas.
Reliability
The AR1200 supports the following reliability features for LDP LSPs:
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Local LDP session: established only between adjacent LSRs.
Remote LDP session: established primarily between indirectly connected LSRs and also
between adjacent LSRs.
LDP-IGP synchronization
On an MPLS network with both the primary and backup LSPs, if the primary LSP fails,
traffic switches from the primary LSP to the backup LSP. This process causes traffic
interruption hundreds of milliseconds. After the primary LSP recovers, traffic switches
back to the primary LSP. This process causes traffic interruption approximately 5 seconds.
LDP-IGP synchronization can be configured, minimizing traffic interruption during a
traffic switchback to milliseconds.
LDP and static route synchronization
On an MPLS network with both the primary and backup LSPs, LSRs use static routes to
establish LSPs. If the primary LSP fails, traffic switches from the primary LSP to the backup
LSP. This process causes traffic interruption hundreds of milliseconds. After the primary
LSP recovers, traffic switches back to the primary LSP. This process causes traffic
interruption several seconds.
LDP and static route synchronization can be configured, minimizing traffic interruption
during a traffic switchback to milliseconds.
LDP and static route synchronization sets static routes to the inactive state to delay the
traffic switchback. This allows the static route and the primary LSP to become available
simultaneously.
LDP security features
LDP security features include message digest algorithm 5 (MD5) authentication, keychain
authentication, and the Generalized TTL Security Mechanism (GTSM).
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