The Juniper BGP router must be configured to reject route advertisements from CE routers with an originating AS in the AS_PATH attribute that does not belong to that customer.
An XCCDF Rule
Description
<VulnDiscussion>Verifying the path a route has traversed will ensure that the local AS is not used as a transit network for unauthorized traffic. To ensure that the local AS does not carry any prefixes that do not belong to any customers, all PE routers must be configured to reject routes with an originating AS other than that belonging to the customer.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-217059r604135_rule
- Severity
- Low
- References
- Updated
Remediation - Manual Procedure
Step 1: Configure a policy to filter the AS_PATH as shown in the example below:
[edit policy-options]
set as-path PEER_ASx "^x$"
set policy-statement FILTER_ASx term ALLOW_ASx from as-path PEER_ASx
set policy-statement FILTER_ASx term ALLOW_ASx then accept