292 CHAPTER 28: OSPF CONFIGURATION
After the restart, the GR Restarter will send an OSPF GR signal to its neighbors that
will not reset their adjacencies with it. In this way, the GR Restarter can restore the
neighbor table upon receiving the responses from neighbors.
After reestablishing neighbor relationships, the GR Restarter will synchronize the
LSDB and exchange routing information with all adjacent GR-capable neighbors.
After that, the GR Restarter will update its own routing table and forwarding table
based on the new routing information and remove the stale routes. In this way,
the OSPF routing convergence is complete.
Protocols and Standards
■ RFC 1765:OSPF Database Overflow
■ RFC 2328: OSPF Version 2
■ RFC 3101: OSPF Not-So-Stubby Area (NSSA) Option
■ RFC 3137: OSPF Stub Router Advertisement
OSPF Configuration
Task List
Complete the following tasks to configure OSPF:
Task Remarks
“Configuring OSPF Basic Functions” on page 293 Required
“Configuring OSPF Area Parameters” on page 294 Optional
“Configuring OSPF Network Types” on page 295 “Configuring the OSPF
Network Type for an
Interface” on page 296
Optional
“Configuring an NBMA
Neighbor” on page 296
Optional
“Configuring a Router Priority
for an OSPF Interface” on
page 296
Optional
“Configuring OSPF Route Control” on page 297 “Configuring OSPF Route
Summarization” on page 297
Optional
“Configuring OSPF Inbound
Route Filtering” on page 298
Optional
“Configuring ABR Type-3 LSA
Filtering” on page 298
Optional
“Configuring an OSPF Cost for
an Interface” on page 298
Optional
“Configuring the Maximum
Number of OSPF Routes” on
page 299
Optional
“Configuring the Maximum
Number of Load-balanced
Routes” on page 299
Optional
“Configuring a Priority for
OSPF” on page 299
Optional
“Configuring OSPF Route
Redistribution” on page 300
Optional
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