- IP Multicast Technology Overview
- Configuring Basic IP Multicast
- Configuring Basic IP Multicast in IPv6 Networks
- Multitopology Routing
- Using MSDP to Interconnect Multiple PIM-SM Domains
- Configuring Source Specific Multicast
- Tunneling to Connect Non-IP Multicast Areas
- Verifying IP Multicast Operation
- SNMP Traps for IP Multicast
- HSRP Aware PIM
- Monitoring and Maintaining IP Multicast
- IPv6 Multicast: Bootstrap Router
- IPv6 Multicast: PIM Sparse Mode
- IPv6 Multicast: Static Multicast Routing for IPv6
- IPv6 Multicast: PIM Source-Specific Multicast
- IPv6 Source Specific Multicast Mapping
- IPv6 Multicast: Explicit Tracking of Receivers
- IPv6 Bidirectional PIM
- IPv6 Multicast: Routable Address Hello Option
IP Multicast: PIM Configuration Guide, Cisco IOS Release 15SY
Bias-Free Language
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
- Updated:
- January 19, 2018
Chapter: IPv6 Bidirectional PIM
IPv6 Bidirectional PIM
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Restrictions for IPv6 Bidirectional PIM
When the bidirectional (bidir) range is used in a network, all devices in that network must be able to understand the bidirectional range in the bootstrap message (BSM).
Information About IPv6 Bidirectional PIM
Bidirectional PIM
Bidirectional PIM allows multicast devices to keep reduced state information, as compared with unidirectional shared trees in PIM-SM. Bidirectional shared trees convey data from sources to the RPA and distribute them from the RPA to the receivers. Unlike PIM-SM, bidirectional PIM does not switch over to the source tree, and there is no register encapsulation of data from the source to the RP.
A single designated forwarder (DF) exists for each RPA on every link within a bidirectional PIM domain (including multiaccess and point-to-point links). The only exception is the RPL on which no DF exists. The DF is the device on the link with the best route to the RPA, which is determined by comparing MRIB-provided metrics. A DF for a given RPA forwards downstream traffic onto its link and forwards upstream traffic from its link toward the rendezvous point link (RPL). The DF performs this function for all bidirectional groups that map to the RPA. The DF on a link is also responsible for processing Join messages from downstream devices on the link as well as ensuring that packets are forwarded to local receivers discovered through a local membership mechanism such as MLD.
Bidirectional PIM offers advantages when there are many moderate or low-rate sources. However, the bidirectional shared trees may have worse delay characteristics than do the source trees built in PIM-SM (depending on the topology).
Only static configuration of bidirectional RPs is supported in IPv6.
How to Configure IPv6 Bidirectional PIM
Configuring Bidirectional PIM and Displaying Bidirectional PIM Information
1. enable
2. configure terminal
3. ipv6 pim [vrf vrf-name] rp-address ipv6-address [group-access-list] [bidir]
4. exit
5. show ipv6 pim [vrf vrf-name] df [interface-type interface-number] [rp-address]
6. show ipv6 pim [vrf vrf-name] df winner[interface-type interface-number] [rp-address]
DETAILED STEPS
Configuration Examples for IPv6 Bidirectional PIM
Example: Configuring Bidirectional PIM and Displaying Bidirectional PIM Information
The following example displays the DF-election states:
Device# show ipv6 pim df
Interface DF State Timer Metrics
Ethernet0/0 Winner 4s 8ms [120/2]
RP :200::1
Ethernet1/0 Lose 0s 0ms [inf/inf]
RP :200::1
The following example displays information on the RP:
Device# show ipv6 pim df
Interface DF State Timer Metrics
Ethernet0/0 None:RP LAN 0s 0ms [inf/inf]
RP :200::1
Ethernet1/0 Winner 7s 600ms [0/0]
RP :200::1
Ethernet2/0 Winner 9s 8ms [0/0]
RP :200::1
Additional References
Related Documents
Related Topic |
Document Title |
|---|---|
| IPv6 addressing and connectivity |
IPv6 Configuration Guide |
| Cisco IOS commands |
|
| IP multicast commands |
|
| IPv6 commands |
|
| Cisco IOS IPv6 features |
Standards and RFCs
Standard/RFC |
Title |
|---|---|
| RFCs for IPv6 |
IPv6 RFCs |
MIBs
| MIB |
MIBs Link |
|---|---|
|
|
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
Technical Assistance
Description |
Link |
|---|---|
| The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Feature Information for IPv6 Bidirectional PIM
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Feature Name |
Releases |
Feature Information |
|---|---|---|
| IPv6 Bidirectional PIM |
12.2(25)SG 12.2(33)SRA 12.2(25)S 12.3(7)T 12.4 12.4(2)T Cisco IOS XE release 2.3 15.0(1)S |
Bidirectional PIM allows multicast routers to keep reduced state information. Bidirectional shared trees convey data from sources to the RP and distribute them from the RP to the receivers. The following commands were introduced or modified: debug ipv6 pim df-election, ipv6 pim rp-address, show ipv6 pim df, show ipv6 pim df winner. |
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