Users Guide

Track Layer 2 Interfaces......................................................................................................................................... 666
Track Layer 3 Interfaces......................................................................................................................................... 666
Track IPv4 and IPv6 Routes................................................................................................................................... 667
Track a Metric Threshold........................................................................................................................................ 667
Tracking a Metric Threshold................................................................................................................................... 667
Track Route Reachability........................................................................................................................................ 669
Tracking Route Reachability................................................................................................................................... 669
Set Tracking Delays..................................................................................................................................................670
VRRP Object Tracking.............................................................................................................................................670
Object Tracking Conguration...................................................................................................................................... 671
Tracking a Layer 2 Interface.................................................................................................................................... 671
Tracking a Layer 3 Interface....................................................................................................................................672
Displaying Tracked Objects........................................................................................................................................... 673
36 Open Shortest Path First (OSPFv2 and OSPFv3)....................................................................................675
Protocol Overview......................................................................................................................................................... 675
Autonomous System (AS) Areas........................................................................................................................... 675
Area Types................................................................................................................................................................ 676
Networks and Neighbors........................................................................................................................................ 677
Router Types.............................................................................................................................................................677
Designated and Backup Designated Routers....................................................................................................... 679
Link-State Advertisements (LSAs)........................................................................................................................ 679
Virtual Links..............................................................................................................................................................680
Router Priority and Cost.........................................................................................................................................680
OSPF Implementation....................................................................................................................................................681
Fast Convergence (OSPFv2, IPv4 Only)..............................................................................................................682
Multi-Process OSPFv2 (IPv4 only)....................................................................................................................... 682
RFC-2328 Compliant OSPF Flooding................................................................................................................... 682
OSPF ACK Packing................................................................................................................................................. 683
Setting OSPF Adjacency with Cisco Routers...................................................................................................... 683
Conguration Information.............................................................................................................................................684
Conguration Task List for OSPFv2 (OSPF for IPv4)........................................................................................ 684
Sample Congurations for OSPFv2............................................................................................................................ 696
Basic OSPFv2 Router Topology.............................................................................................................................696
OSPF Area 0 — Te 1/1 and 1/2..............................................................................................................................697
OSPF Area 0 — Te 3/1 and 3/2............................................................................................................................ 697
OSPF Area 0 — Te 2/1 and 2/2............................................................................................................................698
OSPFv3 NSSA............................................................................................................................................................... 698
NSSA Options..........................................................................................................................................................698
Conguration Task List for OSPFv3 (OSPF for IPv6).............................................................................................. 698
Enabling IPv6 Unicast Routing...............................................................................................................................699
Assigning IPv6 Addresses on an Interface........................................................................................................... 699
Assigning Area ID on an Interface..........................................................................................................................700
Assigning OSPFv3 Process ID and Router ID Globally........................................................................................700
Assigning OSPFv3 Process ID and Router ID to a VRF.......................................................................................701
Conguring the Cost of OSPFv3 Routes.............................................................................................................. 701
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