Reference Guide

502 | PIM Source-Specific Mode
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Display address ranges in the PIM-SSM range using the command show ip pim ssm-range from EXEC
Privilege mode.
Figure 26-2. Enabling PIM-SSM
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 command
ip igmp ssm-map acl 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 a SSM map is in place and FTOS cannot find any matching access lists for a group, it continues
to create (*,G) entries because there is an implicit deny for unspecified groups in the ACL.
• When you remove the mapping configuration, FTOS removes the corresponding (S,G) states that it
created and reestablishes the original (*,G) states.
• You may enter multiple
ssm-map commands for different access lists. You may also enter multiple
ssm-map commands for the same access list, as long as they use different source addresses.
• When an extended ACL is associated with this command, FTOS displays an error message. If you
apply an extended ACL before you create it, FTOS accepts the configuration, but when the ACL is
later defined, FTOS ignores the ACL and the stated mapping has no effect.
Display the source to which a group is mapped using the command
show ip igmp ssm-map [group], as
shown in Figure 26-4. If use the
group option, the command displays the group-to-source mapping even if
the group is not currently in the IGMP group table. If you do not specify the
group option, then the display
is a list of groups currently in the IGMP group table that have a group-to-source mapping.
Display the list of sources mapped to a group currently in the IGMP group table using the command
show
ip igmp groups
group detail, as shown in Figure 26-4.
2 Enter the command ip pim ssm-range and specify the ACL
you created.
ip pim ssm-range
acl-name
CONFIGURATION
Step Task Command Syntax Command 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