Multicast Routing Configuration Guidelines; Pimv1 And Pimv2 Interoperability - Cisco Catalyst 3120 Software Manual

Chapter 44 Configuring IP Multicast Routing
Table 44-2
Feature
Multicast routing
PIM version
PIM mode
PIM stub routing
PIM RP address
PIM domain border
PIM multicast boundary
Candidate BSRs
Candidate RPs
Shortest-path tree threshold rate
PIM router query message interval

Multicast Routing Configuration Guidelines

To avoid misconfiguring multicast routing on your switch, review the information in these sections:
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PIMv1 and PIMv2 Interoperability

The Cisco PIMv2 implementation provides interoperability and transition between Version 1 and
Version 2, although there might be some minor problems.
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 PIMv2 device detects 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 IETF. We recommend that you
use PIMv2. The BSR mechanism interoperates with Auto-RP on Cisco routers and multilayer switches.
For more information, see the
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 by Auto-RP.
That is, Auto-RP sets its single RP on every router or multilayer switch in the group. Not all routers 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.
OL-12247-01
Default Multicast Routing Configuration
PIMv1 and PIMv2 Interoperability, page 44-11
Auto-RP and BSR Configuration Guidelines, page 44-12
Default Setting
Disabled on all interfaces.
Version 2.
No mode is defined.
None configured.
None configured.
Disabled.
None.
Disabled.
Disabled.
0 kb/s.
30 seconds.
"Auto-RP and BSR Configuration Guidelines" section on page
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
Configuring IP Multicast Routing
44-12.
44-11