Huawei Quidway NetEngine80E Configuration Manual page 775

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Solution
BGP Auto fast
reroute (FRR)
Graceful
restart (GR)
Issue 02 (2014-09-30)
Objective
To switch services
immediately in case of
a link failure.
To avoid traffic
interruption in case of
a BGP restart.
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Feature
After BGP Auto FRR is
enabled on a router, the
router selects the
optimal route from the
routes to the same
destination network. In
addition, the router
automatically adds
information about the
second optimal route to
the backup forwarding
entries of the optimal
route and delivers the
backup forwarding
entry to the forwarding
information base (FIB)
table.
When the active link
becomes faulty, the
system can switch the
traffic immediately to
the standby link. This
process is irrelevant to
route convergence.
Therefore, services are
interrupted only for a
short period of time.
When BGP restarts, the
peer relationship is re-
established and traffic
forwarding is
interrupted. After GR
is enabled, traffic
interruption can be
avoided.
8 BGP Configuration
Note
In most cases, BFD for
BGP and BGP Auto
FRR are used together.
BGP Auto FRR takes
effect based on the
BFD detection result.
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