Cisco Catalyst 3850 series Configuration Manual page 148

Restrictions for Configuring Auto-RP and BSR
• If routed interfaces are configured in sparse mode, Auto-RP can still be used if all devices are configured
with a manual RP address for the Auto-RP groups.
• If routed interfaces are configured in sparse mode and you enter the ip pim autorp listener global
configuration command, Auto-RP can still be used even if all devices are not configured with a manual
RP address for the Auto-RP groups.
Restrictions for Configuring BSR
The following are the restrictions for configuring BSR (if used in your network configuration):
• Configure the candidate BSRs as the RP-mapping agents for Auto-RP.
• For group prefixes advertised through Auto-RP, the PIMv2 BSR mechanism should not advertise a
subrange of these group prefixes served by a different set of RPs. In a mixed PIMv1 and PIMv2 domain,
have backup RPs serve the same group prefixes. This prevents the PIMv2 DRs from selecting a different
RP from those PIMv1 DRs, due to the longest match lookup in the RP-mapping database.
Restrictions and Guidelines for Configuring Auto-RP and BSR
The following are restrictions for configuring Auto-RP and BSR (if used in your network configuration):
• If your network is all Cisco routers and multilayer devices, you can use either Auto-RP or BSR.
• If you have non-Cisco routers in your network, you must use BSR.
• If you have Cisco PIMv1 and PIMv2 routers and multilayer devices and non-Cisco routers, you must
use both Auto-RP and BSR. If your network includes routers from other vendors, configure the Auto-RP
mapping agent and the BSR on a Cisco PIMv2 device. Ensure that no PIMv1 device is located in the
path a between the BSR and a non-Cisco PIMv2 device.
Note
• Because bootstrap messages are sent hop-by-hop, a PIMv1 device prevents these messages from reaching
all routers and multilayer devices in your network. Therefore, if your network has a PIMv1 device in it
and only Cisco routers and multilayer devices, it is best to use Auto-RP.
• If you have a network that includes non-Cisco routers, configure the Auto-RP mapping agent and the
BSR on a Cisco PIMv2 router or multilayer device. Ensure that no PIMv1 device is on the path between
the BSR and a non-Cisco PIMv2 router.
• If you have non-Cisco PIMv2 routers that need to interoperate with Cisco PIMv1 routers and multilayer
devices, both Auto-RP and a BSR are required. We recommend that a Cisco PIMv2 device be both the
Auto-RP mapping agent and the BSR.
Related Topics
Setting Up Auto-RP in a New Internetwork (CLI), on page 146
Auto-RP, on page 130
Configuring Candidate BSRs (CLI), on page 159
PIMv2 Bootstrap Router, on page 133
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
124
There are two approaches to using PIMv2. You can use Version 2 exclusively in your
network or migrate to Version 2 by employing a mixed PIM version environment.
Configuring PIM
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