If Border Gateway Protocol (BGP) is enabled on The Arista Multilayer Switch, The Arista Multilayer Switch must not be a BGP peer with a router from an Autonomous System belonging to any Alternate Gateway.

From Arista MLS DCS-7000 Series RTR Security Technical Implementation Guide

Part of SRG-NET-000019-RTR-000010

Associated with: CCI-001414

SV-75357r1_rule If Border Gateway Protocol (BGP) is enabled on The Arista Multilayer Switch, The Arista Multilayer Switch must not be a BGP peer with a router from an Autonomous System belonging to any Alternate Gateway.

Vulnerability discussion

The perimeter router will not use a routing protocol to advertise NIPRNet addresses to Alternate Gateways. Most ISPs use Border Gateway Protocol (BGP) to share route information with other autonomous systems, that is, any network under a different administrative control and policy than a local site. If BGP is configured on the perimeter router, no BGP neighbors will be defined to peer routers from an AS belonging to any Alternate Gateway. The only allowable method is a static route to reach the Alternate Gateway.

Check content

This requirement applies only to DoDIN enclaves. Review the configuration of the router connecting to the Alternate Gateway via the "show router bgp [processID]" command. Verify there are no BGP neighbors configured to the remote AS that belongs to the Alternate Gateway service provider. If there are BGP neighbors connecting the remote AS of the Alternate Gateway service provider, this is a finding.

Fix text

Configure a static route on the perimeter router to reach the AS of a router connecting to an Alternate Gateway Ip route [destination/mask] [forwarding interface]

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