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PowerConnect B-Series FCX Configuration Guide 743
53-1002266-01
PIM Sparse
25
FIGURE 122 Example of a PIM Sparse domain
PIM Sparse switch types
Switches that are configured with PIM Sparse interfaces also can be configured to fill one or more
of the following roles:
• PMBR – A PIM switch that has some interfaces within the PIM domain and other interface
outside the PIM domain. PBMRs connect the PIM domain to the Internet.
NOTE
You cannot configure a Dell routing interface as a PMBR interface for PIM Sparse in the current
software release.
• BSR – The Bootstrap Router (BSR) distributes RP information to the other PIM Sparse switches
within the domain. Each PIM Sparse domain has one active BSR. For redundancy, you can
configure ports on multiple switches as candidate BSRs. The PIM Sparse protocol uses an
election process to select one of the candidate BSRs as the BSR for the domain. The BSR with
the highest BSR priority (a user-configurable parameter) is elected. If the priorities result in a
tie, then the candidate BSR interface with the highest IP address is elected. In the example in
Figure 122, PIM Sparse switch B is the BSR. Port 2/2 is configured as a candidate BSR.
• RP – The RP is the meeting point for PIM Sparse sources and receivers. A PIM Sparse domain
can have multiple RPs, but each PIM Sparse multicast group address can have only one active
RP. PIM Sparse switches learn the addresses of RPs and the groups for which they are
responsible from messages that the BSR sends to each of the PIM Sparse switches. In the
example in Figure 122, PIM Sparse Switch B is the RP. Port 2/2 is configured as a candidate
Rendezvous Point (RP).
PIM Sparse
Switch B
Port2/1
207.95.8.10
Port2/2
207.95.7.1
Rendezvous Point (RP) path
Port3/8
207.95.8.1
Port3/8
207.95.7.2
VE 1
207.95.6.1
VE 1
207.95.6.2
Shortest Path Tree (SPT) path
PIM Sparse
Switch A
PIM Sparse
Switch C
209.157.24.162
Source for Group
239.255.162.1
Receiver for Group
239.255.162.1
This interface is also the
Bootstrap Router (BR) for
this PIM Sparse domain, and
the Rendezvous Point (RP) for the
PIM Sparse groups in this domain.