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DES-7200 Configuration Guide Chapter 3 MPLS Reliability Configuration
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(including IP prefix) from PE2 and will only start BGP best path selection after receiving EOR flag
from PE2. Then, it will start sending prefix-carrying Update messages to PE2, after which it will
further send EOR flag to PE2. After PE2 receives the EOR flag, it will also start best path
selection. The network is converged in this way.
¾ LDP processing
PE1 sends GR-Capable Initialization message to the neighboring P device and establish a
GR-Capable LDP session after receiving the Initialization message from neighbor. Two devices
will begin to exchange address information and label mapping information, and remove or retain
the "stale" mark of MPLS forwarding data according to the information exchanged. Upon
completion of GR, both neighbors will delete their own MPLS forwarding data marked as "stale".
Note
The afore-cited IGP GR, BGP GR and LDP GR processing procedures are
given in a random order. In terms of routing convergence, unicast routes will
be converged first, and the converged routes will be advertised to LDP
protocol for further use.
Caution
Before all protocols complete GR, only the RIB information of main
management board will be updated; the FIB information of interface board
won't be updated.
After all protocols complete GR, FIB information of the interface board will be
updated at the same time.
Protocol specification
NA
3.1.2.2 Configure L3VPN GR
The following sections describe how to configure L3VPN GR:
Create configuration tasks
Configure L3VPN
Configure IGP GR
Configure BGP GR
Configure LDP GR