Brocade Multi-Service IronWare Multicast Configuration Guide (Supporting R05.6.00) - Manual (Page 170)

158 Multi-Service IronWare Multicast Configuration Guide
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IPv6 PIM Sparse
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Changing the Shortest Path Tree threshold
In a typical IPv6 PIM Sparse domain, there may be two or more paths from a designated router (DR)
for a multicast source to an IPv6 PIM group receiver:
• Path through the RP – This is the path the device uses the first time it receives traffic for an
IPv6 PIM group. However, the path through the RP may not be the shortest path from the
device to the receiver.
• 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 the device
configured as an IPv6 PIM router receives a packet for an IPv6 group, it sends the packet to the
RP for that group, which in turn will forward it to all the intended DRs that have registered with
the RP. The first time the device is a recipient, it receives a packet for an IPv6 group and
evaluates the shortest path to the source and initiates a switchover to the SPT. Once the device
starts receiving data on the SPT, the device proceeds to prune itself from the RPT.
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 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.
Brocade(config)# ipv6 router pim
Brocade(config-ipv6-pim-router)# spt-threshold 1000
To change the number of packets the device receives using the RP before switching to the SPT for a
specified VRF, enter commands such as the following.
Brocade(config)# ipv6 router pim vrf blue
Brocade(config-ipv6-pim-router-vrf-blue)# 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.
Brocade(config)# ipv6 router pim
Brocade(config-ipv6-pim-router)# rp-adv-interval 180
Changed RP ADV interval to 180 seconds.
To specify how frequently the candidate RP configured on the device sends candidate RP
advertisement messages to the BSR for a specified VRF, enter commands such as the following.
Brocade(config)# ipv6 router pim vrf blue
Brocade(config-ipv6-pim-router-vrf-blue)# 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.