With Source-Specific Multicast (SSM)
mapping, a host receives multicast traffic directly from identified sources.
-
Enter global configuration
mode.
device# configure terminal
-
Enter VLAN configuration mode.
device (config)# vlan 101
-
Configure the IGMP query
interval for the VLAN.
device (config-vlan-101)# ip igmp snooping query-interval 101
-
Configure the prefix list, which
contains the IP addresses to map.
device (config)# ip igmp ssm-map ?
Possible completions:
<Word:1-32> IP prefix-list name
enable Enables IGMPv2 SSM Mapping
-
Configure SSM mapping, which
associates an IGMPv1 or IGMPv2 report packet with the configured source address,
which is 203.0.0.1 in this example.
device (config-vlan-101)# ip igmp ssm-map enab
device (config-vlan-101)# ip igmp ssm-map prefix-list1 203.0.0.1
device (config-vlan-101)# show ip igmp ssm-map
Fri Jul 21 11:30:06.878 UTC-07:00
+------------------------------------+-------------------+
| PrefixList Name | Source Address |
+------------------------------------+-------------------+
prefix-list1 203.0.0.1
-
Specify the SSM group range,
which is 238.0.0.0/8 in this example.
device (config-router-pim-vrf-default-vrf)# router pim
device (config-router-pim-vrf-default-vrf)# ssm-enable
device (config-router-pim-vrf-default-vrf)# ssm-enable range prefix-list1
device# show ip pim settings
Fri Jul 21 11:31:45.333 UTC-07:00
vrf : default-vrf
Maximum mcache : 32768 Current Count : 0
Hello interval : 30 Neighbor timeout : 105
Join/Prune interval : 60 Inactivity interval : 180
Hardware drop enabled : 1 Prune wait interval : 3
Register Suppress Time : 60 Register Probe Time : 10
Register Stop Delay : 0 Register Suppress interval : 0
SSM Enabled : Yes SPT Threshold : 1
SSM Group Range : 232.0.0.0/8
SSM Range Prefix_name : prefix-list1
Route Precedence : uc-non-default uc-default none
This example sends an IGMPv2 report for group 238.0.0.1.
device # show ip igmp group
Total Number of Groups: 1
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter Version
238.0.0.1 vlan101 00:04:40 00:03:31 101.0.0.10 3
Member Ports: eth0/2
device # show ip igmp group detail
Group : 238.0.0.1
Interface vlan101
Uptime 00:04:53
Expires: 00:03:18
Last Reporter: 101.0.0.10
Member Ports: eth0/2
Last Reporter Mode: 3
Interface : eth0/2
INCL_SRC_LIST: 203.0.0.1
EXCL_SRC_LIST: Nil
device # show ip pim mc
Fri Jul 21 11:58:17.278 UTC-07:00
Total entries in mcache: 1
1 (203.0.0.1, 238.0.0.1) in Eth 0/16, Uptime 00:05:23
SSM=1, RPT=0 SPT=1 Reg=0 RegSupp=0 RegProbe=0 JDUp=1 LSrc=0 LRcv=1
upstream neighbor=91.0.0.2
AgeSltMsk: 0 KAT timer: Expired
num_oifs = 1
Ve101(00:05:23/0) Flags: MI
Flags (0x080684d4)
ssm=1 needRte=0
