Huawei NetEngine80E Configuration Manual - Reliability page 338

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
BFD for
everything
BFD for CR-
LSP
BFD for TE
BFD for RSVP
Issue 02 (2014-09-30)
Usage Scenario
BFD for static CR-LSP and BFD for
RSVP CR-LSP can be used to
replace MPLS OAM to detect the
MPLS TE tunnel protection groups
and trigger primary/backup CR-
LSP switchover. BFD for CR-LSP
is applicable to the hot-standby CR-
LSP. It detects the primary and
backup CR-LSPs and triggers CR-
LSPs switchover.
BFD for TE allows applications
such as VPN FRR or VLL FRR to
fast switch traffic if the primary
tunnel fails, preventing service
interruption.
If a Layer 2 device exists on a link
between RSVP neighboring nodes,
the neighboring node cannot rapidly
detect the fault after the link fails,
resulting in a great loss of data. BFD
detects faults at millisecond level in
protected links or nodes. BFD for
RSVP rapidly detects faults in an
RSVP neighbor, allowing packets
to switch to a backup LSP rapidly.
BFD for RSVP is applied to a
scenario where TE FRR is used and
a Layer 2 device exists on the
primary LSP between a Point of
Local Repair(PLR) and its
downstream neighbors. On a
network where GR is enabled on the
PLR and Merge Point(MP), BFD
for RSVP is also recommended.
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5 BFD Configuration
Configuration Reference
Configuring Static BFD for CR-
LSP
Configuring Dynamic BFD for
CR-LSP
Configuring Static BFD for TE
Configuring Dynamic BFD for
RSVP
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