Posted on January 5, 2022 2:13 pm
 |  Asked by Blažej Krajňák
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I have mixed ASM / SSM environment. How can I specify source IP for groups joined via IGMPv2?

For now, when an IGMPv2 join come, the L2 layer starts to receive specified group from all sources. I want to specify just one source IP for each group. Cisco has implemented ip igmp ssm-map static [acl] [source] or mapping via DNS map. Is there any similar solution in EOS?




Answered on January 6, 2022 10:36 am

Hi Blazej,

Thanks for reaching out.

Could you please take a look at the below document which might match your requirement:




Posted by Naveen Chandra
Answered on January 7, 2022 3:08 am

Hi Blazej,

Thanks for writing to the forum. Above, my colleague Bhavana has shared a very helpful document. PIM-SM Static Source Discovery( PIM-SM SSD) can be helpful for your requirements. You can configure pim ssm range in your device for this purpose.

PIM-SM Static Source Discovery( PIM-SM SSD) is designed to bridge the gap between PIM-SSM and IGMP (*, G) join message. PIM-SM SSD allows static configuration of a specific source address for a group address as part of CLI configuration. Once the router receives IGMP (* G) join from hosts connected it and if the group G belongs to SSM range, it will use the configured source address(s) designated to the group address G and initiate PIM(S, G) join towards the source(s); thus allowing clients that do not have support for IGMPv3 (S, G) join to still use PIM-SSM.

Below is the sample configuration.


router pim sparse-mode

   ip pim ssm range halfSsmRangeAcl

   ip pim ssm default source



Posted by Blažej Krajňák
Answered on January 7, 2022 10:55 am


thank to both. These commands are missing EOS Manual, I were looking for them. They do exactly what  I want.

Just a try: any plan to implement DNS based SSM default source mapping?

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