HPE FlexNetwork HSR6800 Configuration Manual page 403

RelayNextHop : 3002::1
Neighbor : 3001::1
Interface : GigabitEthernet2/1/1
State : Active Adv
Tunnel ID : 0x0
Age : 4538sec
Destination : 1200::
NextHop : 2001::1
RelayNextHop : 2002::1
Neighbor : 2001::1
Interface : GigabitEthernet2/1/2
State : Invalid Adv
Tunnel ID : 0x0
Age : 4515sec
The output shows that Router C has two routes to reach network 1200::0/64: Router
C<—>Router B<—>Router A, which is the currently active route, and Router C<—>Router
D<—>Router A, which is the backup route.
# Enable BFD debugging on Router C.
<RouterC> debugging bfd scm
<RouterC> debugging bfd event
<RouterC> debugging bgp bfd
<RouterC> terminal monitor
<RouterC> terminal debugging
# The following debugging information shows that Router C can quickly detect the failure on
Router B.
%Nov 5 11:42:24:172 2009 RouterC BFD/5/BFD_CHANGE_FSM:
Sess[3002::2/3001::1,13/17,GE2/1/1,Ctrl], Sta: UP->DOWN, Diag: 1
%Nov 5 11:42:24:172 2009 RouterC BGP/5/BGP_STATE_CHANGED: 3001::1 state is changed
from ESTABLISHED to IDLE.
*Nov 5 11:42:24:187 2009 RouterC RM/6/RMDEBUG: BGP_BFD: Recv BFD DOWN msg, Src IP
3002::2, Dst IP 3001::1, Instance ID 0.
*Nov 5 11:42:24:187 2009 RouterC RM/6/RMDEBUG: BGP_BFD: Reset BGP session 3001::1
for BFD session down.
*Nov 5 11:42:24:187 2009 RouterC RM/6/RMDEBUG: BGP_BFD: Send DELETE msg to BFD,
Connection type DIRECT, Src IP 3002::2, Dst IP 3001::1, Instance ID 0.
# Display route 1200::0/64 on Router C, and you can see that Router A and Router C
communicate through Router D.
<RouterC> display ipv6 routing-table 1200::0 64 verbose
Routing Table :
Summary Count : 1
Destination : 1200::
NextHop : 2001::1
RelayNextHop : 2002::1
Neighbor : 2001::1
Interface : GigabitEthernet2/1/2
State : Active Adv
Tunnel ID : 0x0
391
Tag : 0H
ProcessID : 0
Protocol : BGP4+
Cost : 50
Label : NULL
PrefixLength : 64
Preference : 255
Tag : 0H
ProcessID : 0
Protocol : BGP4+
Cost : 100
Label : NULL
PrefixLength : 64
Preference : 255
Tag : 0H
ProcessID : 0
Protocol : BGP4+
Cost : 100
Label : NULL