configured with the PIM passive mode does not pass or forward PIM control traffic, it only passes and forwards
IGMP traffic.
•
Before configuring PIM stub routing, you must have IP multicast routing configured on both the stub
router and the central router. You must also have PIM mode (dense-mode, sparse-mode, or
dense-sparse-mode) configured on the uplink interface of the stub router.
•
The PIM stub router does not route the transit traffic between the distribution routers. Unicast (EIGRP)
stub routing enforces this behavior. You must configure unicast stub routing to assist the PIM stub router
behavior.
•
Only directly connected multicast (IGMP) receivers and sources are allowed in the Layer 2 access
domains. The PIM protocol is not supported in access domains.
•
The redundant PIM stub router topology is not supported.
Restrictions for PIM
Restrictions 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 switches, 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 switches 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.
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.
Note
•
Because bootstrap messages are sent hop-by-hop, a PIMv1 device prevents these messages from reaching
all routers and multilayer switches in your network. Therefore, if your network has a PIMv1 device in
it and only Cisco routers and multilayer switches, 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 switch. 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
switches, 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.
Catalyst 2960-XR Switch IP Multicast Routing Configuration Guide, Cisco IOS Release 15.0(2)EX1
36 OL-29426-01
Configuring PIM
Restrictions for PIM
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