Multicast and Routing Guide K/KA/KB.15.15

Shortest-path tree (SPT).......................................................................................................95
Shortest-path tree operation............................................................................................95
Restricting multicast traffic to RPTs....................................................................................96
Maintaining an active route for multicast group members....................................................96
Border routers and multiple PIM-SM domains....................................................................96
Pim-SM router types................................................................................................................96
DR...................................................................................................................................96
BSR..................................................................................................................................97
BSR configuration and election........................................................................................97
BSR role in fault recovery................................................................................................97
RP....................................................................................................................................97
Defining supported multicast groups................................................................................98
C-RP election................................................................................................................98
Redundant Group Coverage Provides Fault-Tolerance.........................................................99
Static RP (static RP).............................................................................................................99
General application......................................................................................................99
Supporting a static RP as primary..................................................................................100
Operating rules for static RPs........................................................................................100
Configuration.............................................................................................................100
Operating rules and recommendations....................................................................................100
Configuration steps for PIM-SM...............................................................................................101
Planning considerations....................................................................................................101
Per-router global configuration context................................................................................102
Per-VLAN PIM-SM configuration.........................................................................................102
Router Pim configuration...................................................................................................103
Operating notes...................................................................................................................104
Event log messages...............................................................................................................105
4 Routing Basics........................................................................................107
Viewing the IP route table......................................................................................................107
Increasing ARP age timeout (CLI)............................................................................................107
Setting and viewing the arp-age value (Menu)..........................................................................108
Reconfiguring the router ID (optional)......................................................................................109
Changing the router ID.....................................................................................................109
Enabling proxy ARP..............................................................................................................109
Enabling local proxy ARP.................................................................................................110
Enabling forwarding of IP directed broadcasts (CLI)..................................................................110
Disabling the directed broadcasts......................................................................................111
Disabling replies to broadcast ping requests.............................................................................111
Disabling all ICMP unreachable messages..........................................................................111
Disabling ICMP redirects...................................................................................................111
Overview of IP routing...........................................................................................................111
IP interfaces.........................................................................................................................112
IP tables and caches.............................................................................................................112
ARP cache table..............................................................................................................112
ARP cache.................................................................................................................112
IP route table...................................................................................................................113
Routing paths.............................................................................................................113
Administrative distance................................................................................................113
IP forwarding cache..............................................................................................................114
IP route exchange protocols...................................................................................................114
IP global parameters for routing switches............................................................................114
IP interface parameters for routing switches.........................................................................116
Configuring IP parameters for routing switches..........................................................................117
Configuring IP addresses..................................................................................................117
6 Contents