Install guide

14 Software Reference
Bootstrap router
candidates
Each network of PIM–SM routers must have a bootstrap router (BSR). Each
PIM–SM connected network must have at least one bootstrap router candidate.
The candidate with the highest preference value becomes the bootstrap router.
The default preference is 1. The bootstrap router sends a bootstrap message to
other PIM–SM routers, containing a list of the RP candidates for multicast
groups at BSM interval seconds. To designate the switch as a bootstrap router
candidate, use the command:
add pim bsrcandidate [preference=0..255]
To change the switch’s preference of bootstrap router candidate, use the
command:
set pim bsrcandidate preference=0..255
To stop the switch from being as a bootstrap router candidate, use the
command:
delete pim bsrcandidate
To display information about the switch’s bootstrap router configuration, use
the command:
show pim bsrcandidate
Rendezvous point Each multicast group must have a rendezvous point (RP), which is either
chosen dynamically from the list of rendezvous point candidates available or is
statically configured on each router that processes traffic for that group. For
dynamic RP selection, there must be at least one RP candidate in the PIM-SM
connected network, but generally there should be several. PIM-SM chooses the
RP candidate with lowest preference value to be the RP for the multicast group.
The lower the number, the higher its priority. The default priority is 192. The
dynamically-chosen RP advertises itself to the current bootstrap router at an
interval specified by the advinterval parameter in the set pim command. The
default advinterval is 60 seconds.
When an IP host joins a multicast group on a router, the router sends a join
message to the active rendezvous point. The rendezvous point then knows to
send multicast packets for the group to this router. When the last IP host leaves
a group, the router sends a prune message to the RP, telling it that it no longer
needs to receive multicast packets for the group.
To configure the switch to be a dynamic RP candidate, use the command:
add pim rpcandidate group=group-address [mask=ipaddress]
[priority=0..255]
To modify the switch’s RP candidate priority, use the command:
set pim rpcandidate group=ipadd [mask=ipadd] priority=0..255
The switch has the same values for priority for all multicast groups for which it
is a rendezvous point candidate, so changing the priority for one group
changes it for all groups.
To stop the switch from being an RP candidate, use the command:
delete pim rpcandidate group=group-address [mask=ipadd]