Displays Protocol Independent Multicast (PIM) Sparse configuration information, including whether the hardware-drop feature is enabled or disabled, and information for PIM Source-Specific Multicast (SSM) range and access control list (ACL) configuration.

show ip pim sparse

User EXEC mode

The show ip pim sparse command displays the following information:

Output Field

Description

Maximum mcache

Maximum number of multicast cache entries.

Current Count

Number of multicast cache entries used.

Hello interval

How often the device sends PIM Sparse hello messages to its PIM Sparse neighbors. This field shows the number of seconds between hello messages. PIM Sparse routers use hello messages to discover one another.

Neighbor timeout

Number of seconds the device waits for a hello message from a neighbor before determining that the neighbor is no longer present and is not removing cached PIM Sparse forwarding entries for the neighbor. The default is 105 seconds.

Join/Prune interval

How frequently the device sends IPv6 PIM Sparse Join or Prune messages for the multicast groups it is forwarding. This field shows the number of seconds between Join or Prune messages.

The device sends Join or Prune messages on behalf of multicast receivers that want to join or leave a PIM Sparse group. When forwarding packets from PIM Sparse sources, the device sends the packets only on the interfaces on which it has received join requests in Join or Prune messages for the source group.

Inactivity interval

Number of seconds a forwarding entry can remain unused before the router deletes it. The default is 180 seconds.

Hardware Drop Enabled

Whether hardware-drop is enabled or disabled.

To prevent unwanted multicast traffic from being sent to the CPU, PIM Routing and Passive Multicast Route Insertion (PMRI) can be used together to ensure that multicast streams are only forwarded out ports with interested receivers and unwanted traffic is dropped in the hardware on Layer 3 switches.

Prune Wait Interval

Number of seconds a PIM device waits before stopping traffic to neighbor devices that do not want the traffic. The range is 0 to 3 seconds. The default is 3 seconds.

Bootstrap Msg interval

How frequently the BSR configured on the device sends the RP set to the RPs within the PIM Sparse domain. The RP set is a list of candidate RPs and their group prefixes. The group prefix of a candidate RP indicates the range of PIM Sparse group numbers for which it can be an RP.

Note: This field contains a value only if an interface on the device is elected to be the BSR. Otherwise, the field is blank.

Candidate-RP Msg interval

Number of seconds the candidate RP configured on the Layer 3 switch sends candidate RP advertisement messages to the BSR. The default is 60 seconds.

Register Suppress Time

The mean interval between receiving a Register-Stop and allowing registers to be sent again. A lower value means more frequent register bursts at the RP, while a higher value means longer join latency for new receivers. The default is 60 seconds.

Register Probe Time

Number of seconds the PIM router waits for a Register-Stop from an RP before it generates another NULL register to the PIM RP. The default is 10 seconds.

Register Stop Delay

Register stop message. The default is 10 seconds.

Register Suppress interval

Number of seconds that it takes the designated router to send a Register-encapsulated date to the RP after receiving a Register-Stop message. The default is 60 seconds.

SSM Enabled

If yes, Source-Specific Multicast (SMM) is configured globally on this router.

SPT threshold

Number of packets the device sends using the path through the RP before switching to the SPT path. The default is 1 packet.

SSM Group Range

Source-Specific Multicast (SSM) group range.

Route Precedence

The route precedence configured to control the selection of routes based on the four route types:
  • Non-default route from the mRTM
  • Default route from the mRTM
  • Non-default route from the uRTM
  • Default route from the uRTM

Slow Path Disable All

Disabling of slow path forwarding of all multicast data packets.

Slow Path Enable SSM

Slow path forwarding for SSM groups.

Slow Path Filter Acl

Slow path forwarding of IP multicast data packets for groups in an access control list (ACL)..

The following example displays PIM Sparse configuration information including information about slow path forwarding configurations. 

device> show ip pim sparse

Global PIM Sparse Mode Settings
  Maximum Mcache         : 16384       Current Count              : 3
  Hello interval         : 30          Neighbor timeout           : 105
  Join/Prune interval    : 60          Inactivity interval        : 180
  Hardware Drop Enabled  : Yes         Prune Wait Interval        : 3
  Bootstrap Msg interval : 60          Candidate-RP Msg interval  : 60
  Register Suppress Time : 60          Register Probe Time        : 10
  Register Stop Delay    : 10
  SSM Enabled            : Yes         SPT Threshold              : 1
  SSM Group Range        : 232.0.0.0/8
  Route Precedence       : uc-non-default uc-default mc-non-default mc-default
  Slow Path Disable All  : Yes	
  Slow Path Enable SSM   : Yes
  Slow Path Filter Acl   : acl
Release version Command history
08.0.95 The output for this command was enhanced to include information about slow path forwarding configurations.