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Configuring S,G Expiry Timers
By default, S, G entries expire in 210 seconds. You can configure a global expiry time (for all [S,G] entries)
or configure an expiry time for a particular entry.
If you configure both, the ACL supersedes the global configuration for the specified entries.
When you create, delete, or update an expiry time, the changes are applied when the keep alive timer
refreshes.
To configure a global expiry time or to configure the expiry time for a particular (S,G) entry, use the
following commands.
1. Enable global expiry timer for S, G entries.
CONFIGURATION mode
ip pim sparse-mode sg-expiry-timer seconds
The range is from 211 to 86,400 seconds.
The default is 210.
2. Create an extended ACL.
CONFIGURATION mode
ip access-list extended access-list-name
3. Specify the source and group to which the timer is applied using extended ACLs with permit rules
only.
CONFIG-EXT-NACL mode
[seq sequence-number] permit ip source-address/mask | any | host source-
address} {destination-address/mask | any | host destination-address}
4. Set the expiry time for a specific (S,G) entry (as shown in the following example).
CONFIGURATION mode
ip pim sparse-mode sg-expiry-timer seconds sg-list access-list-name
The range is from 211 to 86,400 seconds.
The default is 210.
Example Configuring an (S,G) Expiry Time
NOTE: The expiry time configuration is nullified and the default global expiry time is used if:
• an ACL is specified in the ip pim sparse-mode sg-expiry-timer command, but the ACL
has not been created or is a standard ACL.
• if the expiry time is specified for an (S,G) entry in a deny rule.
Dell(conf)#ip access-list extended SGtimer
Dell(config-ext-nacl)#permit ip 10.1.2.3/24 225.1.1.0/24
Dell(config-ext-nacl)#permit ip any 232.1.1.0/24
Dell(config-ext-nacl)#permit ip 100.1.1.0/16 any
Dell(config-ext-nacl)#show conf
PIM Sparse-Mode (PIM-SM)
675