Reference Guide
PIM-Sparse Mode (PIM-SM) | 1151
ip pim sparse-mode
c e s
Enable PIM sparse mode and IGMP on the interface.
Syntax ip pim sparse-mode
To disable PIM sparse mode and IGMP, enter no ip pim sparse-mode.
Defaults
Disabled.
Command Modes
INTERFACE
Command
History
Usage
Information
C-Series supports a maximum of 31 PIM interfaces.
The interface must be enabled (
no shutdown command) and not have the switchport 
command configured. Multicast must also be enabled globally (using the 
ip 
multicast-lag-hashing command). PIM is supported on the port-channel interface.
Related
Commands
ip pim sparse-mode sg-expiry-timer
c e s
Enable expiry timers globally for all sources, or for a specific set of (S,G) pairs 
defined by an access list. 
Syntax ip pim sparse-mode sg-expiry-timer seconds [access-list name]
To disable configured timers and return to default mode, enter no ip pim sparse-mode 
sg-expiry-timer
.
Parameters
Defaults
Disabled. The default expiry timer (with no times configured) is 210 sec.
Command Modes
CONFIGURATION
Version 8.3.19.0 Introduced on S4820T
Version 8.3.7.0 Introduced on S4810 
Version 8.1.1.0 Introduced on E-Series ExaScale
Version 7.8.1.0 Introduced on C-Series on port-channels and S-Series
ip multicast-lag-hashing Enable multicast globally.
seconds
 Enter the number of seconds the S, G entries will be retained.
Range 211-86400
access-list name
(OPTIONAL) Enter the name of a previously configured Extended ACL to 
enable the expiry time to specified S,G entries










