Concept Guide

Specify port as connected to multicast router.................................................................................................... 665
Enable Snooping Explicit Tracking.........................................................................................................................666
Display the MLD Snooping Table........................................................................................................................... 666
35 Object Tracking........................................................................................................................................667
Object Tracking Overview.............................................................................................................................................667
Track Layer 2 Interfaces..........................................................................................................................................668
Track Layer 3 Interfaces..........................................................................................................................................668
Track IPv4 and IPv6 Routes................................................................................................................................... 669
Track a Metric Threshold........................................................................................................................................669
Tracking a Metric Threshold...................................................................................................................................669
Track Route Reachability......................................................................................................................................... 671
Tracking Route Reachability.................................................................................................................................... 671
Conguring track reachability refresh interval......................................................................................................672
Set Tracking Delays..................................................................................................................................................673
VRRP Object Tracking.............................................................................................................................................673
Object Tracking Conguration......................................................................................................................................673
Tracking a Layer 2 Interface....................................................................................................................................673
Tracking a Layer 3 Interface....................................................................................................................................674
Conguring track reachability refresh interval......................................................................................................676
Displaying Tracked Objects........................................................................................................................................... 676
36 Open Shortest Path First (OSPFv2 and OSPFv3)....................................................................................678
Protocol Overview......................................................................................................................................................... 678
Autonomous System (AS) Areas............................................................................................................................678
Area Types................................................................................................................................................................ 679
Networks and Neighbors........................................................................................................................................680
Router Types............................................................................................................................................................ 680
Designated and Backup Designated Routers....................................................................................................... 682
Link-State Advertisements (LSAs)........................................................................................................................682
Virtual Links.............................................................................................................................................................. 683
Router Priority and Cost.........................................................................................................................................683
OSPF Implementation................................................................................................................................................... 684
Fast Convergence (OSPFv2, IPv4 Only)..............................................................................................................685
Multi-Process OSPFv2 (IPv4 only)....................................................................................................................... 685
RFC-2328 Compliant OSPF Flooding................................................................................................................... 685
OSPF ACK Packing................................................................................................................................................. 686
Setting OSPF Adjacency with Cisco Routers...................................................................................................... 686
Conguration Information............................................................................................................................................. 687
Conguration Task List for OSPFv2 (OSPF for IPv4).........................................................................................687
Sample Congurations for OSPFv2............................................................................................................................ 699
Basic OSPFv2 Router Topology.............................................................................................................................699
OSPF Area 0 — Te 1/1 and 1/2............................................................................................................................. 700
OSPF Area 0 — Te 3/1 and 3/2............................................................................................................................700
OSPF Area 0 — Te 2/1 and 2/2.............................................................................................................................701
OSPFv3 NSSA................................................................................................................................................................ 701
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