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pimd: SwitchToSptDesired addition

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Add code to tell us if we want to switch to a SPT for the (S,G)

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com
This commit is contained in:
Donald Sharp 2015-10-16 09:11:51 -07:00 committed by Donald Sharp
parent f14248dddb
commit cb40b272bf
2 changed files with 39 additions and 2 deletions
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37
pimd/pim_upstream.c
View File

@ -719,10 +719,9 @@ pim_upstream_keep_alive_timer (struct thread *t)
* But this is the start.
*/
return 0;
return 1;
}
void
pim_upstream_keep_alive_timer_start (struct pim_upstream *up,
uint32_t time)
@ -732,3 +731,37 @@ pim_upstream_keep_alive_timer_start (struct pim_upstream *up,
pim_upstream_keep_alive_timer,
up, time);
}
/*
* 4.2.1 Last-Hop Switchover to the SPT
*
* In Sparse-Mode PIM, last-hop routers join the shared tree towards the
* RP. Once traffic from sources to joined groups arrives at a last-hop
* router, it has the option of switching to receive the traffic on a
* shortest path tree (SPT).
*
* The decision for a router to switch to the SPT is controlled as
* follows:
*
* void
* CheckSwitchToSpt(S,G) {
* if ( ( pim_include(*,G) (-) pim_exclude(S,G)
* (+) pim_include(S,G) != NULL )
* AND SwitchToSptDesired(S,G) ) {
* # Note: Restarting the KAT will result in the SPT switch
* set KeepaliveTimer(S,G) to Keepalive_Period
* }
* }
*
* SwitchToSptDesired(S,G) is a policy function that is implementation
* defined. An "infinite threshold" policy can be implemented by making
* SwitchToSptDesired(S,G) return false all the time. A "switch on
* first packet" policy can be implemented by making
* SwitchToSptDesired(S,G) return true once a single packet has been
* received for the source and group.
*/
int
pim_upstream_switch_to_spt_desired (struct in_addr source, struct in_addr group)
{
return 0;
}

4
pimd/pim_upstream.h
View File

@ -136,4 +136,8 @@ void pim_upstream_update_could_assert(struct pim_upstream *up);
void pim_upstream_update_my_assert_metric(struct pim_upstream *up);
void pim_upstream_keep_alive_timer_start (struct pim_upstream *up, uint32_t time);
int pim_upstream_switch_to_spt_desired (struct in_addr source, struct in_addr group);
#define SwitchToSptDesired(S,G) pim_upstream_switch_to_spt_desired ((S), (G))
#endif /* PIM_UPSTREAM_H */