Deployment Guide

• 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 eective even when the default range is not added to the SSM ACL.
• Extended ACLs cannot be used for conguring SSM range. Be sure to create the ACL rst 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
Use PIM-SSM with IGMP Version 2 Hosts
PIM-SSM requires receivers that support IGMP version 3. You can employ PIM-SSM even when receivers support only IGMP version 1 or
version 2 by translating (*,G) entries to (S,G) entries.
Translate (*,G) entries to (S,G) entries using the ip igmp ssm-map acl command source from CONFIGURATION mode. In a standard
access list, specify the groups or the group ranges that you want to map to a source. Then, specify the multicast source.
• When an SSM map is in place and the Dell Networking OS cannot nd any matching access lists for a group, it continues to create
(*,G) entries because there is an implicit deny for unspecied groups in the ACL.
• When you remove the mapping conguration, the Dell Networking OS removes the corresponding (S,G) states that it created and re-
establishes the original (*,G) states.
• You may enter multiple ssm-map commands for dierent access lists. You may also enter multiple ssm-map commands for the same
access list, as long as they use dierent source addresses.
• When an extended ACL is associated with this command, the system displays an error message. If you apply an extended ACL before
you create it, the system accepts the conguration, but when the ACL is later dened, the system ignores the ACL and the stated
mapping has no eect.
PIM
Source-Specic Mode (PIM-SSM) 607