Check: CISR-RT-000007
Cisco ISR 4000 Series RTR STIG:
CISR-RT-000007
(in version v1 r1)
Title
The Cisco ISR 4000 Series router must not be a BGP peer with a router from an Autonomous System belonging to any Alternate Gateway. (Cat II impact)
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
Review the configuration of the Cisco ISR 4000 Series router connecting to the Alternate Gateway. 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 Cisco ISR 4000 Series router to reach the AS of a router connecting to an Alternate Gateway, using the following command: ISR4000 (config) #ip route <Destination Prefix> <Destination Prefix mask> <Forwarding routers address> The configuration would look similar to the example below: ip route 1.1.1.0 255.255.255.0 2.2.2.2
Additional Identifiers
Rule ID:
Vulnerability ID: V-74109
Group Title:
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-001414 |
The information system enforces approved authorizations for controlling the flow of information between interconnected systems based on organization-defined information flow control policies. |
Controls
Number | Title |
---|---|
AC-4 |
Information Flow Enforcement |