Dell PowerConnect B-RX Configuration Manual page 1308

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IPv6 PIM sparse
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By default, the device switches from the RP to the SPT after receiving the first packet for a given
IPv6 PIM Sparse group. The device maintains a separate counter for each IPv6 PIM Sparse
source-group pair.
You can change the number of packets that the device receives using the RP before switching to
using the SPT.
To change the number of packets the device receives using the RP before switching to the SPT,
enter commands such as the following.
BigIron RX(config)# ipv6 router pim
BigIron RX(config-ipv6-pim-router)# spt-threshold 1000
Syntax: [no] spt-threshold infinity | <num>
The infinity | <num> parameter specifies the number of packets. If you specify infinity, the device
sends packets using the RP indefinitely and does not switch over to the SPT. If you enter a specific
number of packets, the device does not switch over to using the SPT until it has sent the number of
packets you specify using the RP.
Setting the RP advertisement interval
To specify how frequently the candidate RP configured on the device sends candidate RP
advertisement messages to the BSR, enter commands such as the following.
BigIron RX(config)# ipv6 router pim
BigIron RX(config-ipv6-pim-router)# rp-adv-interval 180
Changed RP ADV interval to 180 seconds.
Syntax: rp-adv-interval <seconds>
The <seconds > parameter specifies the number of seconds. The default is 60 seconds.
Changing the PIM join and prune message interval
By default, the device sends PIM Sparse Join/Prune messages every 60 seconds. These messages
inform other PIM Sparse routers about clients who want to become receivers (Join) or stop being
receivers (Prune) for PIM Sparse groups.
NOTE
Use the same Join/Prune message interval on all the PIM Sparse routers in the PIM Sparse domain.
If the routers do not all use the same timer interval, the performance of PIM Sparse can be adversely
affected.
To change the Join/Prune interval, enter commands such as the following.
BigIron RX(config)# ipv6 router pim
BigIron RX(config-ipv6-pim-router)# message-interval 30
1236
Shortest Path – Each IPv6 PIM Sparse router that is a DR for an IPv6 receiver calculates a
short path tree (SPT) towards the source of the IPv6 multicast traffic. The first time a BigIron
RX that is configured as an IPv6 PIM router receives a packet for an IPv6 group, it sends the
packet to the RP for hat group, which in turn will forward it to all the intended DRs that have
registered with the RP. The first time a BigIron RX that is a recipient receives a packet for an
IPv6 group, it evaluates the shortest path to the source and initiates a switch over to the SPT.
Once the BigIron RX starts receiving data on the SPT, the BigIron RX will proceed to prune itself
from the RPT.
BigIron RX Series Configuration Guide
53-1001986-01