Users Guide

Track Layer 3 Interfaces.........................................................................................................................................643
Track IPv4 and IPv6 Routes...................................................................................................................................644
Track a Metric Threshold....................................................................................................................................... 644
Tracking a Metric Threshold.................................................................................................................................. 644
Track Route Reachability........................................................................................................................................646
Tracking Route Reachability...................................................................................................................................646
Set Tracking Delays.................................................................................................................................................647
VRRP Object Tracking............................................................................................................................................ 647
Object Tracking Configuration.....................................................................................................................................648
Tracking a Layer 2 Interface.................................................................................................................................. 648
Tracking a Layer 3 Interface.................................................................................................................................. 649
Displaying Tracked Objects..........................................................................................................................................650
35 Open Shortest Path First (OSPFv2 and OSPFv3)...................................................................................652
Protocol Overview.........................................................................................................................................................652
Autonomous System (AS) Areas...........................................................................................................................652
Area Types................................................................................................................................................................653
Networks and Neighbors........................................................................................................................................654
Router Types............................................................................................................................................................654
Designated and Backup Designated Routers.......................................................................................................656
Link-State Advertisements (LSAs).......................................................................................................................656
Virtual Links.............................................................................................................................................................. 657
Router Priority and Cost.........................................................................................................................................657
OSPF Implementation...................................................................................................................................................658
Fast Convergence (OSPFv2, IPv4 Only)............................................................................................................. 659
Multi-Process OSPFv2 (IPv4 only).......................................................................................................................659
RFC-2328 Compliant OSPF Flooding...................................................................................................................659
OSPF ACK Packing.................................................................................................................................................660
Setting OSPF Adjacency with Cisco Routers......................................................................................................660
Configuration Information............................................................................................................................................. 661
Configuration Task List for OSPFv2 (OSPF for IPv4)........................................................................................661
Sample Configurations for OSPFv2............................................................................................................................ 673
Basic OSPFv2 Router Topology............................................................................................................................ 673
OSPF Area 0 — Te 1/1 and 1/2.............................................................................................................................674
OSPF Area 0 — Te 3/1 and 3/2........................................................................................................................... 674
OSPF Area 0 — Te 2/1 and 2/2........................................................................................................................... 675
Configuration Task List for OSPFv3 (OSPF for IPv6)............................................................................................. 675
Enabling IPv6 Unicast Routing...............................................................................................................................676
Assigning IPv6 Addresses on an Interface........................................................................................................... 676
Assigning Area ID on an Interface..........................................................................................................................676
Assigning OSPFv3 Process ID and Router ID Globally........................................................................................677
Assigning OSPFv3 Process ID and Router ID to a VRF......................................................................................677
Configuring the Cost of OSPFv3 Routes.............................................................................................................678
Configuring Stub Areas...........................................................................................................................................678
Configuring Passive-Interface................................................................................................................................678
Redistributing Routes..............................................................................................................................................679
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