R0106-HP MSR Router Series Layer 3 - IP Routing Configuration Guide(V7)

Configuring RIP GR

GR ensures forwarding continuity when a routing protocol restarts or an active/standby switchover

occurs.

Two routers are required to complete a GR process. The following are router roles in a GR process.

• GR restarter—Graceful restarting router. It must have GR capability.

• GR helper—A neighbor of the GR restarter. It helps the GR restarter to complete the GR process.

After RIP restarts on a router, the router must learn RIP routes again and update 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") maintain their adjacencies with the

router within a 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 RIP-enabled device acts as the GR helper. Perform this task on the GR restarter.

To configure GR on the GR restarter:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Enter RIP view.

rip [ process-id ] [ vpn-instance

vpn-instance-name ]

N/A

3. Enable GR for RIP.

graceful-restart By default, RIP GR is disabled.

Configuring BFD for RIP

RIP detects route failures by periodically sending requests. If it receives no response for a route within a

certain time, RIP considers the route unreachable. To speed up convergence, perform this task to enable

BFD for RIP. For more information about BFD, see High Availability Configuration Guide.

RIP supports the following BFD detection modes:

• Single-hop echo detection—Detection mode for a direct neighbor. In this mode, a BFD session is

established only when the directly connected neighbor has route information to send.

• Single-hop echo detection for a specific destination—In this mode, a BFD session is established to

the specified RIP neighbor when RIP is enabled on the local interface.

• Bidirectional control detection—Detection mode for an indirect neighbor. In this mode, a BFD

session is established only when both ends have routes to send and BFD is enabled on the receiving

interface.

Configuring single-hop echo detection (for a directly connected

RIP neighbor)

Ste

Command

Remarks

1. Enter system view.

system-view N/A