H3C Technologies H3C S12500 Series Switches User Manual
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Local Discr: 1441 Remote Discr: 1450
Source IP: FE80::20F:FF:FE00:1202 (link-local address of VLAN-interface 10 on
Switch A)
Destination IP: FE80::20F:FF:FE00:1200 (link-local address of VLAN-interface 10 on
Switch B)
Session State: Up Interface: Vlan10
Hold Time: /
# Display routes destined for 2001:4::0/64 on Switch A.
<SwitchA> display ipv6 routing-table 2001:4::0 64 verbose
Routing Table :
Summary Count : 2
Destination : 2001:4:: PrefixLength : 64
NextHop : 2001::2 Preference : 10
IpPrecedence : QosLcId :
RelayNextHop : :: Tag : 0H
Neighbor : :: ProcessID : 0
Interface : Vlan-interface10 Protocol : OSPFv3
State : Active Adv Cost : 1
Tunnel ID : 0x0 Label : NULL
Age : 4538sec
Destination : 2001:4:: PrefixLength : 64
NextHop : 2001:2::2 Preference : 10
IpPrecedence : QosLcId :
RelayNextHop : :: Tag : 0H
Neighbor : :: ProcessID : 0
Interface : Vlan-interface11 Protocol : OSPFv3
State : Invalid Adv Cost : 2
Tunnel ID : 0x0 Label : NULL
Age : 4515sec
The output shows that Switch A communicates with Switch B through VLAN-interface 10. Then the
link over VLAN-interface 10 fails.
# Enable BFD debugging on Switch A.
<SwitchA> debugging bfd scm
<SwitchA> debugging bfd event
<SwitchA> debugging ospfv3 event bfd
<SwitchA> terminal debugging
%Nov 5 11:37:43:062 2009 SwitchA BFD/5/BFD_CHANGE_FSM: Sess[FE80::20F:FF:FE00:1202/
FE80::20F:FF:FE00:1200,15/15,Vlan10,Ctrl], Sta: UP->DOWN, Diag: 1
%Nov 5 11:37:43:062 2009 SwitchA OSPFV3/5/OSPFv3_NBR_CHG: OSPFv3 1 Neighbor
2.2.2.2(Vlan-interface10) from Full to Down.
*Nov 5 11:37:43:062 2009 SwitchA RM/6/RMDEBUG: OSPFv3 OSPFv3-BFD: Message Type rcv
BFD down, Connect Type direct-connect, Src IP Address FE80::20F:FF:FE00:1202, Dst IP
Address FE80::20F:FF:FE00:1200.
*Nov 5 11:37:43:062 2009 SwitchA RM/6/RMDEBUG: OSPFv3 OSPFv3-BFD: Message Type delete
session, Connect Type direct-connect, Src IP Address FE80::20F:FF:FE00:1202, Dst IP
Address FE80::20F:FF:FE00:1200.
The output shows that Switch A can quickly detect the change on Switch B.