Cisco Systems 3560 Benutzerhandbuch

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Catalyst 3560 Switch Software Configuration Guide
OL-8553-06
Chapter 44      Configuring IP Multicast Routing
Configuring IP Multicast Routing
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.
Sparse-mode groups in a mixed PIMv1 and PIMv2 region are possible because the Auto-RP feature in 
PIMv1 interoperates with the PIMv2 RP feature. Although all PIMv2 devices can also use PIMv1, we 
recommend that the RPs be upgraded to PIMv2. To ease the transition to PIMv2, we have these 
recommendations:
  •
Use Auto-RP throughout the region.
  •
Configure sparse-dense mode throughout the region.
If Auto-RP is not already configured in the PIMv1 regions, configure Auto-RP. For more information, 
see the 
Auto-RP and BSR Configuration Guidelines
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. 
  •
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.
  •
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. For more information, see the 
.
Configuring Basic Multicast Routing
You must enable IP multicast routing and configure the PIM version and the PIM mode. Then the 
software can forward multicast packets, and the switch can populate its multicast routing table.