The Arista BGP router must be configured to reject route advertisements from BGP peers that do not list their autonomous system (AS) number as the first AS in the AS_PATH attribute.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-255992 | ARST-RT-000060 | SV-255992r945854_rule | CCI-000032 | low |
| Description | ||||
| Verifying the path a route has traversed will ensure the IP core is not used as a transit network for unauthorized or possibly even internet traffic. All autonomous system boundary routers (ASBRs) must ensure updates received from eBGP peers list their AS number as the first AS in the AS_PATH attribute. | ||||
| STIG | Date | |||
| Arista MLS EOS 4.X Router Security Technical Implementation Guide | 2025-02-20 | |||
Related Frameworks
1 mapping across 3 frameworks
Related Frameworks
SCF0 mappings
No source states a mapping between these directly.
Also reachable in 3 hops (1) derived by us, not asserted by any source
Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.
- DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- SCF Secure Traceability Relationship Mapping (STRM)2026.2equal to
NIST 800-530 mappings
No source states a mapping between these directly.
Also reachable in 2 hops (2) derived by us, not asserted by any source
Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.
- DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
- DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
- DISA STIG Benchmark (XCCDF)2our copyintersects(normalised)
- DISA STIG Benchmark (XCCDF)2intersects(normalised)
- DISA CCI List2025-01-23equal to(normalised)
CCI1 mapping
CCI-000032
1.00
- DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
Details
Check Text (C-255992r945854_chk)
The feature below is enabled by default.
Verify the BGP configuration to deny the updates received from eBGP peer that do not have the proper AS in the AS_PATH_attribute. To verify the BGP config and that the feature is applied, execute the command "show run all | in first".
router bgp 65001
bgp enforce-first-as
If the router is not configured for "enforce-first-as", this is a finding.
Fix Text (F-59611r882317_fix)
Configure all Arista ASBR routers to deny updates received from eBGP peers that do not list their AS number as the first AS in the AS_PATH attribute.
LEAF-1A(config)#router bgp 65001
LEAF-1A(config-router-bgp)#bgp enforce-first-as