3Com S7902E, Configuration Manual

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[SwitchB] display ospf routing
OSPF Process 1 with Router ID 2.2.2.2
Routing Tables
Routing for Network
Destination Cost Type NextHop AdvRouter Area
10.2.1.0/24 2 Transit 10.2.1.1 3.3.3.3 0.0.0.1
10.3.1.0/24 5 Inter 10.2.1.2 3.3.3.3 0.0.0.0
10.1.1.0/24 2 Transit 10.1.1.2 2.2.2.2 0.0.0.0
Total Nets: 3
Intra Area: 2 Inter Area: 1 ASE: 0 NSSA: 0
Switch B has learned the route 10.3.1.0/24 to Area 2.
Configuring OSPF Graceful Restart
Network requirements
As shown in the following figure:
z
Switch A, Switch B and Switch C that belong to the same autonomous system and the same OSPF
routing domain are GR capable.
z
Switch A acts as the non IETF standard GR Restarter whereas Switch B and Switch C are the GR
Helpers and re-synchronize their LSDB with Switch A through OOB communication of GR.
Figure 1-28 Network diagram for OSPF GR configuration
Vlan-int100
192.1.1.1/24
Vlan-int100
192.1.1.3/24
Vlan-int100
192.1.1.2/24
GR helper GR helper
GR restarter
Switch A
Switch C Switch B
Router ID: 1.1.1.1
Router ID: 2.2.2.2
Router ID: 3.3.3.3
Configuration procedure
1) Configure IP addresses for interfaces (omitted)
2) Configure OSPF GR
# Configure Switch A
<SwitchA> system-view
[SwitchA] router id 1.1.1.1
[SwitchA] ospf 100
[SwitchA-ospf-100] enable link-local-signaling
[SwitchA-ospf-100] enable out-of-band-resynchronization
[SwitchA-ospf-100] graceful-restart