R3303-HP HSR6800 Routers Layer 3 - IP Routing Configuration Guide

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%Jan 19 10:41:51:203 2008 RouterA BFD/4/LOG:Sess[192.168.1.1/192.168.1.2,
GE2/1/1,Ctrl], Sta: UP->DOWN, Diag: 1
*Jan 19 10:33:12:813 2008 RouterA RM/6/RMDEBUG: RIP-BFD: Message Type Disable, Connect
Type Direct-connect, Pkt Type Echo, Src IP Address 192.168.1.1, Src IFIndex4, Nbr IP
Address 192.168.1.2.
# Display the BFD information of Router A.
<RouterA> display bfd session
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