Dell EMC SmartFabric OS10 User Guide Release 10.5.0

Control-plane ACLs

OS10 offers control-plane ACLs to selectively restrict packets that are destined to the CPU port, thereby providing increased security. Control-plane ACLs offer:

• An option to protect the CPU from denial of service (DoS) attacks.
• Fine-grained control to allow or block traffic going to the CPU.

Control-plane ACLs apply on the front-panel and management ports. Control-plane ACLs are one of the following types:

• IP ACL
• IPv6 ACL
• MAC ACL
  NOTE MAC ACL is applied only on packets that enter through the front-panel ports.

There is no implicit deny rule. If none of the configured conditions match, the default behavior is to permit. If you need to deny traffic that does not match any of the configured conditions, explicitly configure a deny statement.

The control-plane ACL is mutually exclusive with VTY ACL, the management ACL. VTY ACL provides secure access for session connection protocols, such as SSH or TELNET; however, control-plane ACLs permit or deny any TCP or UDP, including SSH and TELNET sessions, from specific hosts and networks, and also filters both IPv4 and IPv6 traffic.

Configure control-plane ACL

To configure control-plane ACLs, use the existing ACL template and create the appropriate rules to permit or deny traffic as needed, similar to creating an access list for VTY ACLs. However, when you apply this control-plane ACL, you must apply it in CONTROL-PLANE mode instead of VTY mode. For example:

OS10# configure terminal
OS10(config)# control-plane
OS10(config-control-plane)# ip access-group acl_name in

where acl_name is the name of the control-plane ACL, a maximum of 140 characters.