Cisco Systems 78-11741-02 Wireless Office Headset User Manual


 
Configuring IP Multicast Routing
Configuring PIM Version 2
IPC-421
Cisco IOS IP Configuration Guide
Note The Cisco IOS implementation of PIM BSR uses the value 0 as the default priority for candidate RPs
and BSRs. This implementation predates the draft-ietf-pim-sm-bsr IETF draft, the first IETF draft to
specify 192 as the default priority value. The Cisco IOS implementation, thus, deviates from the IETF
draft. To comply with the default priority value specified in the draft, you must explicitly set the priority
value to 192.
Consider the following scenarios when deciding which routers should be RPs:
In a network of Cisco routers where only Auto-RP is used, any router can be configured as an RP.
In a network of routers that includes only Cisco PIM Version 2 routers and routers from other
vendors, any router can be used as an RP.
In a network of Cisco PIM Version 1 routers, Cisco PIM Version 2 routers, and routers from other
vendors, only Cisco PIM Version 2 routers should be configured as RPs.
To configure a router to be a candidate RP, use the following command in global configuration mode:
For examples of configuring PIM Version 2, see the section “PIM Version 2 Examples” later in this
chapter.
Note The Cisco IOS implementation of PIM BSR selects an RP from a set of candidate RPs using a method
that is incompatible with the specification in RFC 2362. Refer to CSCdy56806 using the Cisco Bug
Toolkit for more information. See the “RFC 2362 Interoperable Candidate RP Example” section on
page 450 for a configuration workaround.
Making the Transition to PIM Version 2
On each LAN, the Cisco implementation of PIM Version 2 automatically enforces the rule that all PIM
messages on a shared LAN are in the same PIM version. To accommodate that rule, if a PIM Version 2
router detects a PIM Version 1 router on the same interface, the Version 2 router downgrades itself to
Version 1 until all Version 1 routers have been shut down or upgraded.
Deciding When to Configure a BSR
If there are only Cisco routers in your network (no routers from other vendors), there is no need to
configure a BSR. Configure Auto-RP in the mixed PIM Version 1/Version 2 environment.
Note The simultaneous deployment of Auto-RP and BSR is not supported.
Command Purpose
Router(config)# ip pim rp-candidate type number
[group-list
access-list] [priority value]
Configures the router to be a candidate RP.