The Nokia multicast Designated Router (DR) must be configured to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Report messages to allow hosts to join only multicast groups that have been approved by the organization.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-283862 | NOKI-RT-000440 | SV-283862r1203835_rule | CCI-002403 | low |
| Description | ||||
| Real-time multicast traffic can entail multiple large flows of data. Large unicast flows tend to be fairly isolated (i.e., someone doing a file download here or there), whereas multicast can have broader impact on bandwidth consumption, resulting in extreme network congestion. Hence, it is imperative that there is multicast admission control to restrict which multicast groups the hosts are allowed to join via IGMP or MLD. | ||||
| STIG | Date | |||
| Nokia Service Router OS 25.x Router Security Technical Implementation Guide | 2026-06-15 | |||
Details
Check Text (C-283862r1203835_chk)
Review the configuration of the DR to verify it is filtering IGMP and MLD report messages, allowing hosts to join only groups that have been approved.
Verify the import policy is applied on the IGMP and MLD interface using the command below:
- show router igmp interface "TO-CE" detail | match "Import-Policy"
Import-Policy : IMPORT_IGMP_JOIN Subnet Check : Enabled
- show router mld interface "TO-CE" detail | match "Import-Policy"
Import-Policy : IMPORT_MLD_JOIN
If the DR is not filtering IGMP and MLD report messages, this is a finding.
Fix Text (F-88332r1203834_fix)
Configure the DR to filter the IGMP and MLD report messages to allow hosts to join only multicast groups that have been approved, as shown in the example below:
Create Prefix-List IPv4 Multicast Group:
- configure router policy-options
- config>router>policy-options# begin
- config>router>policy-options# prefix-list Multicast-Group
- config>router>policy-options>prefix-list$ prefix 239.8.0.0/16 exact
- config>router>policy-options>prefix-list$ exit
Create Prefix-List IPv6 Multicast Group:
- configure router policy-options
- config>router>policy-options# begin
- config>router>policy-options# prefix-list Multicast-Group-IPv6
- config>router>policy-options>prefix-list$ prefix ff3e::/16 exact
- config>router>policy-options>prefix-list$ exit
Create a policy statement for IGMP:
- config>router>policy-options# policy-statement IMPORT_IGMP_JOIN
- config>router>policy-options>policy-statement$ entry 10
- config>router>policy-options>policy-statement>entry# from prefix-list "Multicast-Group"
- config>router>policy-options>policy-statement>entry$ action accept
- config>router>policy-options>policy-statement>entry>action$ exit
- config>router>policy-options>policy-statement>entry$ exit
- config>router>policy-options>policy-statement$ default-action drop
- config>router>policy-options>policy-statement>default-action$ exit
- config>router>policy-options>policy-statement$ exit
- config>router>policy-options# commit
Create a policy statement for MLD:
- config>router>policy-options# policy-statement IMPORT_MLD_JOIN
- config>router>policy-options>policy-statement$ entry 10
- config>router>policy-options>policy-statement>entry$ from prefix-list "Multicast-Group-IPv6"
- config>router>policy-options>policy-statement>entry$ action accept
- config>router>policy-options>policy-statement>entry>action$ exit
- config>router>policy-options>policy-statement>entry$ exit
- config>router>policy-options>policy-statement$ default-action drop
- config>router>policy-options>policy-statement>default-action$ exit
- config>router>policy-options>policy-statement$ exit
- config>router>policy-options# commit
- config>router>policy-options# exit all
Apply import policy to the IGMP and MLD interface:
- configure router igmp interface "TO-CE" import "IMPORT_IGMP_JOIN"
- configure router mld interface "TO-CE" import "IMPORT_MLD_JOIN"