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382 Nokia Network Voyager for IPSO 4.0 Reference Guide
9. In the Sparse Mode Timers section, enter a value for the shortest path tree threshold (in
kilobits per second) in the Threshold (kpbs) text box.
Enter an IP address for the multicast group to which the SPT threshold applies in the
Multicast Group ID text box. Enter the mask length for the group multicast address in the
Mask Length edit box. When the data rate for a sparse-mode group exceeds the shortest-
path-tree threshold at the last-hop router, an (S,G) entry is created and a join/prune message
is sent toward the source. Setting this option builds a shortest-path tree from the source S to
the last-hop router.
10. Click Apply, and then click Save to make your changes permanent.
11. (Optional) In the General Timers section, enter a value for the hello interval (in seconds) in
the Hello Interval edit box.
The router uses this interval to send periodic Hello messages on the LAN.
12. (Optional) In the General Timers section, enter a value for the data interval (in seconds) in
the Data Interval text box.
This value represents the interval after which the multicast (S, G) state for a silent source is
deleted.
13. (Optional) In the General Timers section, enter a value for the assert interval (in seconds) in
the Assert Interval text box.
This value represents the interval between the last time an assert is received and when the
assert is timed out.
14. (Optional) In the General Timers section, enter a value for the assert rate limit in the Assert
Rate Limit text box.
The value represents the number of times per second at which the designated router sends
assert messages. The upper limit is 10,000 assert messages per second.
15. (Optional) In the General Timers section, enter a value (in seconds) for the interval between
sending join/prune messages in the Join/Prune Interval text box.
16. (Optional) In the General Timers section, enter a value for the random delay join/prune
interval (in seconds) in the Random Delay Join/Prune Interval text box.
This value represents the maximum interval between the time when the reverse path
forwarding neighbor changes and when a join/prune message is sent.
17. (Optional) In the General Timers section, enter a value for the join/prune suppression
interval (in seconds) in the Join/Prune Suppression Interval text box.
This value represents the mean interval between receiving a join/prune message with a
higher Holdtime and allowing duplicate join/prune messages to be sent again.
Note
The join/prune suppression interval should be set at 1.25 times the join/prune interval.
18. (Optional) In the Assert Ranks section, enter a value for the routing protocol(s) you are
using in the appropriate text box. Assert Rank values are used to compare protocols and
determine which router forwards multicast packets on a multiaccess LAN. Assert messages
include these values when more than one router can forwarding the multicast packets.