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DES-7200 Configuration Guide Chapter 3 MPLS Reliability Configuration
3-14
z Management board 1+1 redundant backup.
z Supporting non-stop forwarding of routing protocol.
z Supporting BGP/MPLS GR protocol.
z Supporting LDP GR protocol.
Purpose of deploying VPN GR:
z Minimize routing protocol oscillation during main-slave management board switchover.
z Minimize the impacts on VPN service.
z Minimize the single point failure of access device and enhance the reliability of VPN
network.
z Minimize the drop rate of VPN traffic.
Note
The non-stop forwarding of routing protocol means that the unicast route must
support GR function, namely the device must support OSPF GR, IS-IS GR or
BGP GR.
Basic concepts of L3VPN GR
GR routers by capability
In terms of GR capability, there are GR-Capable router, GR-Aware router and GR-Unaware
router.
z GR-Capable router
The router with GR capability. Generally, such router has dual management boards (1+1
redundancy). During main-slave management board switchover, it can advertise its adjacent
neighbors to keep its forwarding data and then rebuild the routing table after switchover without
causing route oscillation. The packet forwarding path remains unchanged, and the entire system
can forward data in a non-stop way.
z GR-Aware router
The router with GR-Aware capability. Such router may not have dual management boards, but it
can detect that its neighbor is experiencing GR and help its neighbor to complete GR.
z GR-Unaware router