R21xx-HP FlexFabric 11900 Layer 3 IP Routing Configuration Guide

301
• GR Helper—A neighbor of the GR Restarter. It helps the GR Restarter to complete the GR process.
After RIPng restarts on a router, the router must learn RIPng routes again and updates its FIB table, which
causes network disconnections and route reconvergence.
With the GR feature, the restarting router (known as the "GR Restarter") can notify the event to its GR
capable neighbors. GR capable neighbors (known as "GR Helpers") keep their adjacencies with the
router within a configurable GR interval. During this process, the FIB table of the router does not change.
After the restart, the router contacts its neighbors to retrieve its FIB.
By default, a RIPng-enabled device acts as the GR Helper. Perform this task on the GR Restarter.
To configure GR on the GR Restarter:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enable RIPng and enter RIPng
view.
ripng [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A
3. Enable the GR capability for
RIPng.
graceful-restart By default, RIP GR is disabled.
Displaying and maintaining RIPng
Execute display commands in any view and reset commands in user view.
Task Command
Display configuration information of a RIPng
process.
display ripng [ process-id ]
Display routes in the RIPng database. display ripng process-id database
Display the routing information of a specified
RIPng process.
display ripng process-id route
Display RIPng interface information.
display ripng process-id interface [ interface-type
interface-number ]
Reset a RIPng process. reset ripng process-id process
Clear statistics of a RIPng process. reset ripng process-id statistics
RIPng configuration examples
Basic RIPng configuration example
Network requirements
As shown in Figure 74, all switches run RIPng. Configure Switch B to filter the route 2::/64 learned from
Switch A and to forward only the route 4::/64 to Switch A.