Messages related to UDP broadcast forwarding.........................................................................312
UDP broadcast forwarding.....................................................................................................................313
Subnet masking for UDP forwarding addresses.................................................................................... 314
Chapter 16 Virtual Router Redundancy Protocol (VRRP).........................315
VRRP overview......................................................................................................................................315
Configuring VRRP..................................................................................................................................315
Enabling VRRP in the global configuration context.....................................................................315
Creating a VR and entering the VR context................................................................................ 316
Selecting a Version of VRRP................................................................................................................. 317
Configuring a VR instance on a VLAN interface.................................................................................... 317
Configuring a virtual IP address (VIP) in a VR............................................................................ 317
Reconfiguring the priority for a backup....................................................................................... 318
Changing VR advertisement interval and source IP address................................................................ 319
Configuring preempt mode on VRRP backup routers............................................................................319
Enabling or disabling VRRP operation on a VR.....................................................................................320
Dynamically changing the priority of the VR.......................................................................................... 320
Configuring track interface.......................................................................................................... 320
Configuring track VLAN...............................................................................................................320
Removing all tracked entities................................................................................................................. 321
Viewing VRRP tracked entities.............................................................................................................. 321
Forcing the backup VR operating as master to relinquish ownership of the VR instance..................... 321
Forcing the backup VR to take ownership of the VR instance...............................................................322
Configuring the Authentication Data Field............................................................................................. 322
Pinging the virtual IP of a backup router................................................................................................ 322
Enabling the response to a ping request.....................................................................................322
Controlling ping responses..........................................................................................................323
Viewing VRRP ping information.................................................................................................. 323
Operational notes........................................................................................................................327
Specifying the time a router waits before taking control of the VIP........................................................327
Viewing VRRP configuration data..........................................................................................................327
Viewing the VRRP global configuration.......................................................................................327
Viewing all VR configurations on the router................................................................................ 328
Viewing a specific VR configuration............................................................................................ 329
Viewing VRRP statistics data......................................................................................................330
Viewing global VRRP statistics only............................................................................................330
Viewing statistics for all VRRP instances on the router...............................................................331
Viewing statistics for all VRRP instances in a VLAN...................................................................333
Viewing statistics for a specific VRRP instance.......................................................................... 334
Viewing the "near-failovers" statistic........................................................................................... 334
Using the debug command with the VRRP option.................................................................................335
General operation.................................................................................................................................. 336
Virtual router (VR)....................................................................................................................... 338
Virtual IP address (VIP)...............................................................................................................339
Master router...............................................................................................................................339
Control of master selection...............................................................................................339
Function of the VRRP advertisement............................................................................... 339
Owner router............................................................................................................................... 340
Backup router..............................................................................................................................340
VR priority operation.........................................................................................................340
Preempt mode..................................................................................................................340
Virtual router MAC address.........................................................................................................340
VRRP and ARP for IPv4............................................................................................................. 341
VRRP and neighbor discovery for IPv6.......................................................................................341
Duplicate address detection (DAD).............................................................................................341
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