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JUNI-RT-000910 - The Juniper Multicast Source Discovery Protocol (MSDP) router must be configured to filter received source-active multicast advertisements for any undesirable multicast groups and sources - policy-options

Information

The interoperability of BGP extensions for interdomain multicast routing and MSDP enables seamless connectivity of multicast domains between autonomous systems. MP-BGP advertises the unicast prefixes of the multicast sources used by Protocol Independent Multicast (PIM) routers to perform RPF checks and build multicast distribution trees. MSDP is a mechanism used to connect multiple PIM sparse-mode domains, allowing RPs from different domains to share information about active sources. When RPs in peering multicast domains hear about active sources, they can pass on that information to their local receivers, thereby allowing multicast data to be forwarded between the domains. Configuring an import policy to block multicast advertisements for reserved, Martian, single-source multicast, and any other undesirable multicast groups, as well as any source-group (S, G) states with Bogon source addresses, would assist in avoiding unwanted multicast traffic from traversing the core.

Solution

Configure the MSDP to implement an import policy to block multicast advertisements for undesirable multicast groups and sources.

Configure the source-active filter to reject undesirable multicast groups and sources as shown in the example below.

[edit policy-options]
set policy-statement SA_IMPORT term BAD_GROUPS from route-filter 224.0.1.2/32 exact
set policy-statement SA_IMPORT term BAD_GROUPS from route-filter 224.77.0.0/16 orlonger
set policy-statement SA_IMPORT term BAD_GROUPS then reject
set policy-statement SA_IMPORT term BAD_SOURCES from source-address-filter x.x.x.x/8 orlonger
set policy-statement SA_IMPORT term BAD_SOURCES from source-address-filter x.x.x.x/16 orlonger
set policy-statement SA_IMPORT term BAD_SOURCES then reject
set policy-statement SA_IMPORT term ACCEPT_OTHERS then accept

Configure the source-active filter to be an import filter.

[edit protocols msdp]
set import SA_IMPORT

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Juniper_Router_Y22M10_STIG.zip

Item Details

Category: ACCESS CONTROL

References: 800-53|AC-4, CAT|III, CCI|CCI-001368, Rule-ID|SV-217095r835204_rule, STIG-ID|JUNI-RT-000910, STIG-Legacy|SV-101183, STIG-Legacy|V-90973, Vuln-ID|V-217095

Plugin: Juniper

Control ID: d185c3a300ea8ff6f84e2047bd082c17cfe51984087d14805bd012f200f9b089