The Dell OS10 BGP router must be configured to reject outbound route advertisements for any prefixes that do not belong to any customers or the local autonomous system (AS).
An XCCDF Rule
Description
Advertisement of routes by an autonomous system for networks that do not belong to any of its customers pulls traffic away from the authorized network. This causes a denial of service (DoS) on the network that allocated the block of addresses and may cause a DoS on the network that is inadvertently advertising it as the originator. It is also possible that a misconfigured or compromised router within the GIG IP core could redistribute IGP routes into BGP, thereby leaking internal routes.
- ID
- SV-269853r1051944_rule
- Version
- OS10-RTR-000050
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Configure all eBGP routers to filter outbound route advertisements for prefixes that are not allocated to or belong to any customer or the local AS.
Step 1: Configure a prefix list for each customer containing prefixes belonging to each.
OS10(config)# ip prefix-list PREFIX_FILTER_A seq 5 permit 50.10.10.0/24 le 32
OS10(config)# ip prefix-list PREFIX_FILTER_A seq 10 permit 60.10.10.0/24 le 32