C
HAPTER
49
| Multicast Routing Commands
PIM Multicast Routing
– 1285 –
C
OMMAND
M
ODE
Global Configuration
C
OMMAND
U
SAGE
u
When the
ip pim rp-candidate
command is entered, the router
periodically sends PIMv2 messages to the BSR advertising itself as a
candidate RP for the specified group addresses. The IP address of the
designated VLAN is sent as the candidate’s RP address. The BSR places
information about all of the candidate RPs in subsequent bootstrap
messages. The BSR uses the RP-election hash algorithm to select an
active RP for each group range. The election process is performed by
the BSR only for its own use. Each PIM-SM router that receives the list
of RP candidates from the BSR also elects an active RP for each group
range using the same election process.
u
The election process for each group is based on the following criteria:
n
Find all RPs with the most specific group range.
n
Select those with the highest priority (lowest priority value).
n
Compute a hash value based on the group address, RP address,
priority, and hash mask included in the bootstrap messages.
n
If there is a tie, use the candidate RP with the highest IP address.
u
This distributed election process provides faster convergence and
minimal disruption when an RP fails. It also serves to provide load
balancing by distributing groups across multiple RPs. Moreover, when
an RP fails, the responsible RPs are re-elected on each router, and the
groups automatically distributed to the remaining RPs.
u
To improve failover recovery, it is advisable to select at least two core
routers in diverse locations, each to serve as both a candidate BSR and
candidate RP. It is also preferable to set up one of these routers as both
the primary BSR and RP.
E
XAMPLE
The following example configures the router to start advertising itself to
the BSR as a candidate RP for the indicated multicast groups.
Console(config)#ip pim rp-candidate interface vlan 1 group-prefix 224.0.0.0
255.0.0.0
Console(config)#end
Console#show ip pim rp mapping
PIM Group-to-RP Mappings
Groups : 224.0.0.0/8
RP address : 192.168.0.2/32
Info source : 192.168.0.2/32, via bootstrap, priority: 0
Uptime : 00:00:51
Expire : 00:01:39
Console#
Summary of Contents for DG-GS4826S
Page 2: ...DG GS4826S DG GS4850S E012011 R01 F1 2 2 0 ...
Page 4: ......
Page 6: ...ABOUT THIS GUIDE 6 ...
Page 60: ...SECTION I Getting Started 60 ...
Page 72: ...CHAPTER 1 Introduction System Defaults 72 ...
Page 90: ...CHAPTER 2 Initial Switch Configuration Managing System Files 90 ...
Page 92: ...SECTION II Web Configuration 92 u Unicast Routing on page 539 u Multicast Routing on page 595 ...
Page 138: ...CHAPTER 4 Basic Management Tasks Resetting the System 138 ...
Page 204: ...CHAPTER 6 VLAN Configuration Configuring MAC based VLANs 204 ...
Page 212: ...CHAPTER 7 Address Table Settings Clearing the Dynamic Address Table 212 ...
Page 238: ...CHAPTER 9 Rate Limit Configuration 238 Figure 106 Configuring Rate Limits ...
Page 268: ...CHAPTER 12 Quality of Service Attaching a Policy Map to a Port 268 ...
Page 368: ...CHAPTER 14 Security Measures DHCP Snooping 368 ...
Page 422: ...CHAPTER 15 Basic Administration Protocols Remote Monitoring 422 ...
Page 488: ...CHAPTER 17 IP Configuration Setting the Switch s IP Address IP Version 6 488 ...
Page 538: ...CHAPTER 20 IP Services Forwarding UDP Service Requests 538 ...
Page 594: ...CHAPTER 21 Unicast Routing Configuring the Open Shortest Path First Protocol Version 2 594 ...
Page 624: ...CHAPTER 22 Multicast Routing Configuring PIMv6 for IPv6 624 ...
Page 638: ...CHAPTER 23 Using the Command Line Interface CLI Command Groups 638 ...
Page 712: ...CHAPTER 26 SNMP Commands 712 ...
Page 720: ...CHAPTER 27 Remote Monitoring Commands 720 ...
Page 776: ...CHAPTER 29 Authentication Commands Management IP Filter 776 ...
Page 876: ...CHAPTER 34 Port Mirroring Commands Local Port Mirroring Commands 876 ...
Page 898: ...CHAPTER 37 Address Table Commands 898 ...
Page 998: ...CHAPTER 41 Quality of Service Commands 998 ...
Page 1060: ...CHAPTER 42 Multicast Filtering Commands MLD Proxy Routing 1060 ...
Page 1078: ...CHAPTER 43 LLDP Commands 1078 ...
Page 1088: ...CHAPTER 44 Domain Name Service Commands 1088 ...
Page 1164: ...CHAPTER 47 IP Interface Commands IPv6 to IPv4 Tunnels 1164 ...
Page 1260: ...CHAPTER 48 IP Routing Commands Open Shortest Path First OSPFv3 1260 ...
Page 1304: ...SECTION IV Appendices 1304 ...
Page 1310: ...APPENDIX A Software Specifications Management Information Bases 1310 ...
Page 1343: ...DG GS4826S DG GS4850S E012011 R02 F1 2 2 0 ...
Page 1344: ......