R3102-R3103-HP 6600/HSR6600 Routers Layer 3 - IP Routing Configuration Guide

The output shows that Router A has deleted the BFD session to Router C and displays no output.

# Display the RIP routes of RIP process 1 on Router A.

<RouterA> display rip 1 route

Route Flags: R - RIP, T - TRIP

P - Permanent, A - Aging, S - Suppressed, G - Garbage-collect

----------------------------------------------------------------------------

The output shows that the RIP route learned from Router C no longer exists.

# Display the RIP route destined for 100.1.1.0/24 on Router A.

<RouterA> display ip routing-table 100.1.1.0 24 verbose

Routing Table : Public

Summary Count : 1

Destination: 100.1.1.0/24

Protocol: RIP Process ID: 2

Preference: 100 Cost: 2

IpPrecedence: QosLcId:

NextHop: 192.168.2.2 Interface: GigabitEthernet2/1/2

BkNextHop: 0.0.0.0 BkInterface:

RelyNextHop: 0.0.0.0 Neighbor : 192.168.2.2

Tunnel ID: 0x0 Label: NULL

BKTunnel ID: 0x0 BKLabel: NULL

State: Active Adv Age: 00h18m40s

Tag: 0

Configure BFD for RIP (single-hop echo detection for a specified

destination)

Network requirements

As shown in Figure 13, GigabitEthernet 2/1/2 of Router A and GigabitEthernet 2/1/1 of Router B run

RIP process 1. GigabitEthernet 2/1/2 of Router B and Router C runs RIP process 1.

Configure a static route destined for 100.1.1.0/24 and enable static route redistribution into RIP on both

Router A and Router C so Router B can learn two routes destined for 100.1.1.0/24 through

GigabitEthernet 2/1/1 and GigabitEthernet 2/1/2. The route redistributed from Router A has a smaller

cost than that redistributed from Router C, so Router B uses the route through GigabitEthernet 2/1/1.

Enable BFD for RIP on GigabitEthernet 2/1/2 of Router A, and specify GigabitEthernet 2/1/1 of Router

B as the destination. When a unidirectional link occurs (packets from Router A can reach Router B, but

packets from Router B cannot reach Router A), BFD can quickly detect the link failure and notify it to RIP.

RIP then deletes the neighbor relationship and the route information learned on GigabitEthernet 2/1/2

and does not receive or send any packets on GigabitEthernet 2/1/2. When the route learned from

Router A ages out, Router B uses the route destined for 100.1.1.1/24 through GigabitEthernet 2/1/2.