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DES-7200 Configuration Guide Chapter 3 MPLS Reliability Configuration
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3.2.1.3 BFD for LSP
As described in the section of "BFD session establishment", we know that BFD session is
discriminated through My Discriminator and Your Discriminator. According to the method of
defining My Discriminator and Your Discriminator, BFD for LSP involves two configurations
modes:
z Manual configuration
Manual configuration will manually configure my discriminator and your discriminator of BFD. In
this way, before BFD session is established, there is no need to negotiate and learn your
discriminator via the discriminator carried in the LSP Ping packet. The BFD session will be
established directly.
z Automatic configuration
Automatic configuration uses the discriminator carried in the LSP Ping packet to negotiate and
learn your discriminator before it can establish the BFD session.
According to the type of LSP, BFD for LSP currently supports the following types:
z BFD for static LSP
z BFD for LDP LSP
BFD for static LSP
BFD for static LSP supports both manual configuration mode and automatic configuration mode.
Since LSP is an unidirectional link and BFD is a bidirectional detection mechanism, when using
BFD to detect the unidirectional link of static LSP, the backward direction link can use any one of
the following detection methods:
z Backward direction link with IP
z Backward direction link with static LSP
BFD for LDP LSP
BFD for static LSP supports both manual configuration mode and automatic configuration mode.
Since LSP is an unidirectional link and BFD is a bidirectional detection mechanism, when using
BFD to detect the unidirectional link of LDP LSP, the backward direction link detection can use
any one of the following detection methods: