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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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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
                                 !
                                 ip access-list extended SGtimer
                                 seq 5 permit ip 10.1.2.0/24 225.1.1.0/24
                                 seq 10 permit ip any 232.1.1.0/24
                                 seq 15 permit ip 100.1.0.0/16 any
                                 Dell(config-ext-nacl)#exit
                                 Dell(conf)
                                 #ip pim sparse-mode sg-expiry-timer 1800 sg-list SGtimer
                              

To display the expiry time configuration, use the show running-configuration [acl | pim] command from EXEC Privilege mode.


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