Example for Configuring OSPFv3 GR

Networking Requirements

In Figure 1, SwitchA, SwitchB, and SwitchC belong to the same OSPFv3 area. They communicate with each other through the OSPFv3 protocol and are enabled with GR.

When OSPFv3 adjacencies are set up between SwitchA, SwitchC, and SwitchB, the three switches exchange routing information. If the OSPFv3 protocol restarts on SwitchA, SwitchA synchronizes data with neighboring switches through GR.

Figure 1 Networking diagram for configuring OSPFv3 GR

Configuration Roadmap

The configuration roadmap is as follows:

Configure IPv6 addresses for interfaces.
Enable basic OSPFv3 functions on each switch.
Enable the OSPFv3 GR helper in the OSPFv3 view of SwitchB.
Enable the OSPFv3 GR in the OSPFv3 view of SwitchA.

Procedure

Add interfaces to VLANs.

# Configure SwitchA. Ensure that the configurations of SwitchB and SwitchC are the same as that of SwitchA.

<HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan 10
[SwitchA-vlan10] quit
[SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] port link-type trunk
[SwitchA-GigabitEthernet0/0/1] port trunk allow-pass vlan 10
[SwitchA-GigabitEthernet0/0/1] quit

Assign IPv6 addresses to the VLANIF interfaces.

# Configure SwitchA. Ensure that the configurations of SwitchB and SwitchC are the same as that of SwitchA.

[SwitchA] ipv6
[SwitchA] interface vlanif 10
[SwitchA-Vlanif10] ipv6 enable
[SwitchA-Vlanif10] ipv6 address fc00:0:0:1000::1/64
[SwitchA-Vlanif10] quit

Configure basic OSPFv3 functions.

# On SwitchA, enable OSPFv3 and set the router ID to 10.1.1.1.

[SwitchA] ospfv3 100
[SwitchA-ospfv3-100] router-id 10.1.1.1
[SwitchA-ospfv3-100] quit
[SwitchA] interface vlanif 10
[SwitchA-Vlanif10] ospfv3 100 area 0
[SwitchA-Vlanif10] quit

# On SwitchB, enable OSPFv3 and set the router ID to 10.2.2.2.

[SwitchB] ospfv3 100
[SwitchB-ospfv3-100] router-id 10.2.2.2
[SwitchB-ospfv3-100] quit
[SwitchB] interface vlanif 10
[SwitchB-Vlanif10] ospfv3 100 area 0
[SwitchB-Vlanif10] quit
[SwitchB] interface vlanif 20
[SwitchB-Vlanif20] ospfv3 100 area 0
[SwitchB-Vlanif20] quit

# On SwitchC, enable OSPFv3 and set the router ID to 10.3.3.3.

[SwitchC] ospfv3 100
[SwitchC-ospfv3-100] router-id 10.3.3.3
[SwitchC-ospfv3-100] quit
[SwitchC] interface vlanif 20
[SwitchC-Vlanif20] ospfv3 100 area 0
[SwitchC-Vlanif20] quit

Enable OSPFv3 GR on SwitchA.

[SwitchA] ospfv3 100
[SwitchA-ospfv3-100] graceful-restart
[SwitchA-ospfv3-100] return

Enable OSPFv3 helper on SwitchB.

[SwitchB] ospfv3 100
[SwitchB-ospfv3-100] helper-role
[SwitchB-ospfv3-100] return

Verify the configuration.

# Run the display ipv6 fib command on SwitchA to view the FIB information.

<SwitchA> display ipv6 fib
 IPv6 FIB Table:
 Total number of Routes : 5

Destination:  ::1                                     PrefixLength: 128
Nexthop    :  ::1                                     Flag        : HU
Interface  :  InLoopBack0                             Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FE80::                                  PrefixLength: 10
Nexthop    :  ::                                      Flag        : BU
Interface  :  NULL0                                   Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FC00:0:0:1000::1                        PrefixLength: 128
Nexthop    :  ::1                                     Flag        : HU
Interface  :  InLoopBack0                             Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FC00:0:0:1000::                         PrefixLength: 64
Nexthop    :  FC00:0:0:1000::1                        Flag        : U
Interface  :  Vlanif10                                Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FC00:0:0:2000::                         PrefixLength: 64
Nexthop    :  FE80::200:1FF:FE00:200                  Flag        : DGU
Interface  :  Vlanif10                                Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

# Restart OSPFv3 process 100 on SwitchA without using the GR mechanism.

<SwitchA> reset ospfv3 100

# Immediately run the display ipv6 fib command on SwitchA to view the FIB information.

<SwitchA> display ipv6 fib 
 IPv6 FIB Table:
 Total number of Routes : 4

Destination:  ::1                                     PrefixLength: 128
Nexthop    :  ::1                                     Flag        : HU
Interface  :  InLoopBack0                             Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FE80::                                  PrefixLength: 10
Nexthop    :  ::                                      Flag        : BU
Interface  :  NULL0                                   Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FC00:0:0:1000::1                        PrefixLength: 128
Nexthop    :  ::1                                     Flag        : HU
Interface  :  InLoopBack0                             Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FC00:0:0:1000::                         PrefixLength: 64
Nexthop    :  FC00:0:0:1000::1                        Flag        : U
Interface  :  Vlanif10                                Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

This information shows that the FIB information on SwitchA has been modified and the forwarding service is affected.

# Restart OSPFv3 process 100 on SwitchA using the GR mechanism.

<SwitchA> reset ospfv3 100 graceful-restart

# Immediately run the display ipv6 fib command on SwitchA to view the FIB information. Check whether GR is functioning normally. If so, the FIB information is not modified and the forwarding is not affected when you restart the OSPFv3 process using GR on SwitchA.

<SwitchA> display ipv6 fib 
 IPv6 FIB Table:
 Total number of Routes : 5

Destination:  ::1                                     PrefixLength: 128
Nexthop    :  ::1                                     Flag        : HU
Interface  :  InLoopBack0                             Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FE80::                                  PrefixLength: 10
Nexthop    :  ::                                      Flag        : BU
Interface  :  NULL0                                   Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FC00:0:0:1000::1                        PrefixLength: 128
Nexthop    :  ::1                                     Flag        : HU
Interface  :  InLoopBack0                             Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FC00:0:0:1000::                         PrefixLength: 64
Nexthop    :  FC00:0:0:1000::1                        Flag        : U
Interface  :  Vlanif10                                Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

Destination:  FC00:0:0:2000::                         PrefixLength: 64
Nexthop    :  FE80::200:1FF:FE00:200                  Flag        : DGU
Interface  :  Vlanif10                                Tunnel ID   : 0x0
TimeStamp  :  2007-06-25 17:31:46

This information shows that the FIB information on SwitchA has not been modified and the forwarding is not affected.

Configuration Files

SwitchA configuration file

# 
sysname SwitchA
# 
ipv6
#
vlan batch 10
#
ospfv3 100 
 router-id 10.1.1.1 
 graceful-restart
#
interface Vlanif10
 ipv6 enable
 ipv6 address FC00:0:0:1000::1/64
 ospfv3 100 area 0.0.0.0
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
# 
return

SwitchB configuration file

# 
sysname SwitchB
# 
ipv6
#
vlan batch 10 20
#
ospfv3 100 
 router-id 10.2.2.2 
 helper-role 
#
interface Vlanif10
 ipv6 enable
 ipv6 address FC00:0:0:1000::2/64
 ospfv3 100 area 0.0.0.0
#
interface Vlanif20
 ipv6 enable
 ipv6 address FC00:0:0:2000::1/64
 ospfv3 100 area 0.0.0.0
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#  
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 20
# 
return

SwitchC configuration file

# 
sysname SwitchC
# 
ipv6
#
vlan batch 20
#
ospfv3 100 
 router-id 10.3.3.3
#
interface Vlanif20
 ipv6 enable
 ipv6 address FC00:0:0:2000::2/64
 ospfv3 100 area 0.0.0.0
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 20
#
return