KB.15.15

Enables and disables the following PIM SNMP traps:

all Enable/Disable all PIM notification traps.

(Default: Disabled)

neighbor-loss Enable/Disable the notification trap sent when the timer

for a multicast router neighbor expires and the switch

has no other multicast router neighbors on the same

VLAN with a lower IP address.

(Default: Disabled)

hardware-mrt-full Enable/Disable notification trap sent when the

hardware multicast routing table (MRT) is full (2048

active flows.) In this state, any additional flows are

handled by the software MRT, which increases

processing time for the affected flows.

(Default: Disabled)

software-mrt-full Enable/Disable notification trap sent when the router's

software MRT is full (that is, when routing resources for

active flows are exhausted.) Note that in this state, the

router does not accept any additional flows.

(Default: Disabled)

NOTE: Trap operation requires configuring an SNMP trap receiver by using the

snmp-server host[ip-addr] command at the global configuration level.

Changing the global join-prune interval on the router

Syntax:

router pim join-prune-interval [5-65535]

Sets the interval in seconds at which periodic PIM-SM join/prune messages are to

be sent on the router's PIM-SM interfaces. This setting is applied to every PIM-SM

interface on the router.

(Default: 60 seconds)

NOTE: All routers in a PIM-SM domain should have the same join-prune-interval

setting.

Changing the shortest-path tree (SPT) operation

Generally, using the SPT option eliminates unnecessary levels of PIM-SM traffic in a domain.

However, in cases where it is necessary to tightly control the paths used by PIM-SM flows to edge

switches, disabling SPT maintains the flows through their original C-RPs regardless of whether

shorter paths exist.

Syntax:

router pim spt-threshold

[no] router pim spt-threshold

When the router is the edge router for a receiver requesting to join a particular

multicast group, this command enables or disables the capability of the router to

convert the group's traffic from the RPT to the SPT.

See “Restricting multicast traffic to RPTs” (page 96).

(Default: Enabled)

76 PIM-SM (Sparse Mode)