Reference Guide

PIM Source-Specific Mode (PIM-SSM) | 631
Implementation Information
• The Dell Networking implementation of PIM-SSM is based on RFC 3569.
• S-Series supports a maximum of 31 PIM interfaces and 2K multicast entries including (*,G), and (S,G)
entries. There is no limit on the number of PIM neighbors S-Series can have.
• FTOS 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.
Configure PIM-SM
Configuring PIM-SSM is a one-step process:
1. Configure PIM-SM. Refer to page 619.
2. Enable PIM-SSM for a range of addresses. Refer to page 631.
Related Configuration Tasks
• Use PIM-SSM with IGMP version 2 Hosts on page 632
Enable PIM-SSM
To enable PIM-SSM:
Step Task Command Syntax Command Mode
1 Create an ACL that uses permit rules to specify what range of
addresses should use SSM. You must at least include one
rule, permit 232.0.0.0/8, which is the default range for
PIM-SSM.
ip access-list
standard name
CONFIGURATION
2 Enter the command ip pim ssm-range and specify the ACL
you created.
ip pim ssm-range
acl-name
CONFIGURATION