Multicast and Routing Guide K/KA/KB.15.15

11 User Datagram Protocol.........................................................................246
Configuring and enabling UDP broadcast forwarding...............................................................246
Globally enabling UDP broadcast forwarding.....................................................................246
Configuring UDP broadcast forwarding on individual VLANs.................................................246
Viewing the current IP forward-protocol configuration............................................................247
Operating notes for UDP broadcast forwarding...................................................................248
Maximum number of entries.........................................................................................248
TCP/UDP port number ranges.......................................................................................248
Messages related to UDP broadcast forwarding...................................................................249
UDP broadcast forwarding....................................................................................................249
Subnet masking for UDP forwarding addresses.........................................................................250
12 Virtual Router Redundancy Protocol (VRRP)...............................................251
VRRP overview.....................................................................................................................251
Configuring VRRP.................................................................................................................251
Enabling VRRP in the global configuration context................................................................251
Creating a VR and entering the VR context..........................................................................252
Selecting a Version of VRRP...................................................................................................252
Configuring a VR instance on a VLAN interface........................................................................253
Configuring a virtual IP address (VIP) in a VR.......................................................................253
Reconfiguring the priority for a backup...............................................................................254
Changing VR advertisement interval and source IP address........................................................254
Configuring preempt mode on VRRP backup routers..................................................................255
Enabling or disabling VRRP operation on a VR.........................................................................255
Dynamically changing the priority of the VR.............................................................................256
Configuring track interface................................................................................................256
Configuring track VLAN....................................................................................................256
Removing all tracked entities..................................................................................................256
Viewing VRRP tracked entities.................................................................................................257
Forcing the backup VR operating as master to relinquish ownership of the VR instance...................257
Forcing the backup VR to take ownership of the VR instance.......................................................257
Configuring the Authentication Data Field................................................................................257
Pinging the virtual IP of a backup router...................................................................................258
Enabling the response to a ping request..............................................................................258
Controlling ping responses................................................................................................258
Viewing VRRP ping information..........................................................................................258
Operational notes............................................................................................................263
Specifying the time a router waits before taking control of the VIP...............................................263
Viewing VRRP configuration data............................................................................................264
Viewing the VRRP global configuration...............................................................................264
Viewing all VR configurations on the router..........................................................................264
Viewing a specific VR configuration....................................................................................266
Viewing VRRP statistics data..............................................................................................267
Viewing global VRRP statistics only.....................................................................................268
Viewing statistics for all VRRP instances on the router............................................................268
Viewing statistics for all VRRP instances in a VLAN...............................................................270
Viewing statistics for a specific VRRP instance......................................................................271
Viewing the "near-failovers" statistic...................................................................................272
Using the debug command with the VRRP option......................................................................273
General operation................................................................................................................274
Virtual router (VR)............................................................................................................276
Virtual IP address (VIP).....................................................................................................277
Master router...................................................................................................................277
Control of master selection...........................................................................................277
Function of the VRRP advertisement................................................................................277
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