The Juniper BGP router must be configured to reject outbound route advertisements for any prefixes belonging to the IP core.
An XCCDF Rule
Description
<VulnDiscussion>Outbound route advertisements belonging to the core can result in traffic either looping or being black holed, or at a minimum, using a nonoptimized path.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-254015r844078_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Configure all eBGP routers to filter outbound route advertisements belonging to the IP core.
For example:
set policy-options prefix-list ip-core-ipv4 192.0.2.0/24
set policy-options prefix-list ip-core-ipv6 2001:db8:2::/64
set policy-options policy-statement advertise-bgp-prefix term exclude-ipv4-core from prefix-list ip-core-ipv4