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DES-7200 Configuration Guide Chapter 3 MPLS Reliability Configuration
3-16
Note
Please refer to "OSPF Routing Protocol Configuration", "BGP Protocol
Configuration" and "LDP GR Configuration" for more information about IGP
GR, BGP GR and LDP GR.
Fig 20 VPN network topology
The following example describes the GR process by taking provider network access point device
PE1 as the example. When main-slave management board switchover takes place on PE1, PE1
plays the role of GR-Restarter, while P device and PE2 play the role of GR-Helper. The handling
process can be divided into three phases:
z Before main-slave management board switchover
Device PE1 and the neighboring CE carry out IGP GR negotiation or eBGP GR negotiation. PE1
and P device carry out IGP or LDP GR negotiation. PE1 and PE2 carry out iBGP GR negotiation.
PE1 sends the Initialization message carrying the optional parameter of FT Session TLV to P
device to establish GR-Capable LDP Session. After LDP Session is established, they exchange
address information and label mapping information, and the GR-Capable LSP is established for
data forwarding.