Implementation Information
• The Dell Networking implementation of PIM-SSM is based on RFC 3569.
• The Dell Networking operating system (OS) reduces the number of control messages sent between
multicast routers by bundling Join and Prune requests in the same message.
Important Points to Remember
• The default SSM range is 232/8 always. Applying an SSM range does not overwrite the default range.
Both the default range and SSM range are effective even when the default range is not added to the
SSM ACL.
• Extended ACLs cannot be used for configuring SSM range. Be sure to create the ACL first and then
apply it to the SSM range.
• The default range is always supported, so range can never be smaller than the default.
Enabling PIM-SSM
To enable PIM-SSM, follow these steps.
1. Create an ACL that uses permit rules to specify what range of addresses should use SSM.
CONFIGURATION mode
ip access-list standard name
2. Enter the ip pim ssm-range command and specify the ACL you created.
CONFIGURATION mode
ip pim ssm-range acl-name
Enabling PIM-SSM
To display address ranges in the PIM-SSM range, use the show ip pim ssm-range command from
EXEC Privilege mode.
R1(conf)#do show run pim
!
ip pim rp-address 10.11.12.2 group-address 224.0.0.0/4
ip pim ssm-range ssm
R1(conf)#do show run acl
!
ip access-list standard ssm
seq 5 permit host 239.0.0.2
R1(conf)#do show ip pim ssm-range
Group Address / MaskLen
239.0.0.2 / 32
680 PIM Source-Specific Mode (PIM-SSM)