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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Applying Egress Layer 3 ACLs (Control-Plane)

By default, packets originated from the system are not filtered by egress ACLs.

For example, if you initiate a ping session from the system and apply an egress ACL to block this type of traffic on the interface, the ACL does not affect that ping traffic. The Control Plane Egress Layer 3 ACL feature enhances IP reachability debugging by implementing control-plane ACLs for CPU-generated and CPU-forwarded traffic. Using permit rules with the count option, you can track on a per-flow basis whether CPU-generated and CPU-forwarded packets were transmitted successfully.
NOTE The ip control-plane [egress filter] and the ipv6 control-plane [egress filter] commands are not supported.
  1. Apply Egress ACLs to IPv4 system traffic.
    CONFIGURATION mode
    ip control-plane [egress filter]
  2. Apply Egress ACLs to IPv6 system traffic.
    CONFIGURATION mode
    ipv6 control-plane [egress filter]
  3. Create a Layer 3 ACL using permit rules with the count option to describe the desired CPU traffic.
    CONFIG-NACL mode
    permit ip {source mask | any | host ip-address} {destination mask | any | host ip-address} count [monitor [session-id]]
Dell EMC Networking OS Behavior: Virtual router redundancy protocol (VRRP) hellos and internet group management protocol (IGMP) packets are not affected when you enable egress ACL filtering for CPU traffic. Packets sent by the CPU with the source address as the VRRP virtual IP address have the interface MAC address instead of VRRP virtual MAC address.

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