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Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
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Chapter44 Configuring IP Multicast Routi ng Configuring IP Multicast Routing
Multicast Routing Configuration Guidelines
To avoid misconfiguring multicast routing on your switch, review the information in these sections:
•PIMv1 and PIMv2 Interoperability, page44-11
•Auto-RP and BSR Configuration Guidelines, page 44-12

PIMv1 and PIMv2 Interoperability

The Cisco PIMv2 implementation provides interoperability and transition between Version 1 and
Version2, although there might be some minor pro blems.
You can upgrade to PIMv2 incrementally. PIM Versions 1 and 2 can be configured on different routers
and multilayer switches within one network. Internally, all routers and multilayer switches on a shared
media network must run the same PIM version. Therefore, if a PIMv 2 d evice det ects a PIMv1 device,
the Version 2 device downgrades itself to Version 1 until all Version 1 devices have been shut down or
upgraded.
PIMv2 uses the BSR to discover and announce RP-set information for each group prefix to all the routers
and multilayer switches in a PIM domain. PIMv1, together with the Auto-RP feature, can perform the
same tasks as the PIMv2 BSR. However, Auto-RP is a standalone protocol, separate from PIMv1, and is
a proprietary Cisco protocol. PIMv2 is a standards track protocol in the IE TF. We recommend that you
use PIMv2. The BSR mechanism interoperates with Auto-RP on Cisco routers and multilayer switches.
For more information, see the “Auto-RP and BSR Configuration Guidelines” section on page 44-12.
When PIMv2 devices interoperate with PIMv1 devices, Auto-RP should have already been deployed. A
PIMv2 BSR that is also an Auto-RP mapping agent automatically advertises the RP elected b y Auto-RP.
That is, Auto-RP sets its single RP on every router or multilayer switch in the group. No t a ll r out ers and
switches in the domain use the PIMv2 hash function to select multiple RPs.
Dense-mode groups in a mixed PIMv1 and PIMv2 region need no special configuration; they
automatically interoperate.
Table44-2 Default Multicast Routing Configuration
Feature Default Setting
Multicast routing Disabled on all interfaces.
PIM version Version 2.
PIM mode No mode is defined.
PIM stub routing None configured .
PIM RP address None configured.
PIM domain border Disabled.
PIM multicast boundary None.
Candidate BSRs Disabled.
Candidate RPs Disabled.
Shortest-path tree threshold rate 0 kb/s.
PIM router query message interval 30 seconds.