TCAM carving question for Cisco Nexus 9396PX

I have Cisco Nexus 9396PX and configure for IPv4 with IPv4 RACL on SVI to block some basic traffic. Now i have configured IPv6 and trying to configure access-list but its saying you don't have TCAM space so i started looking around to see where i can borrow and this is what i have.

As per document i may need 512 slice for ipv6 doble-width.

Question:

1. can i combine two 256 to create 512?
2. what is IPV4 PACL (i don't know who is using it and how to find out if someone using it?)
3. I am using BFD on this switch ( does BFD using redirect tcam space?)

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# show hardware access-list tcam region | exclude 0 IPV4 PACL [ifacl] size = 512 IPV4 Port QoS [qos] size = 256 IPV4 RACL [racl] size = 512 Egress IPV4 RACL [e-racl] size = 256 Ingress System size = 256 Egress System size = 256 Ingress COPP [copp] size = 256 Redirect [redirect] size = 512 NS IPV4 Port QoS [ns-qos] size = 256 NS IPV4 VLAN QoS [ns-vqos] size = 256 NS IPV4 L3 QoS [ns-l3qos] size = 256 VPC Convergence/ES-Multi Home [vpc-convergence] size = 256 Ingress ARP-Ether ACL [arp-ether] size = 256 ranger+ IPV4 QoS [rp-qos] size = 256 ranger+ IPV6 QoS [rp-ipv6-qos] size = 256 ranger+ MAC QoS [rp-mac-qos] size = 256 sFlow ACL [sflow] size = 256 

IPv6 has zero allocation

# show hardware access-list tcam region | grep IPV6 IPV6 PACL [ipv6-ifacl] size = 0 IPV6 Port QoS [ipv6-qos] size = 0 FEX IPV6 PACL [fex-ipv6-ifacl] size = 0 FEX IPV6 Port QoS [fex-ipv6-qos] size = 0 IPV6 VACL [ipv6-vacl] size = 0 IPV6 VLAN QoS [ipv6-vqos] size = 0 IPV6 RACL [ipv6-racl] size = 0 Egress IPV6 QoS [e-ipv6-qos] size = 0 Egress IPV6 VACL [ipv6-vacl] size = 0 Egress IPV6 RACL [e-ipv6-racl] size = 0 IPV6 L3 QoS [ipv6-l3qos] size = 0 NS IPV6 Port QoS [ns-ipv6-qos] size = 0 NS IPV6 VLAN QoS [ns-ipv6-vqos] size = 0 NS IPV6 L3 QoS [ns-ipv6-l3qos] size = 0 ranger+ IPV6 QoS [rp-ipv6-qos] size = 256 

This is what my utilization tables looks (its saying PACL used 3 does that means i can't take that slice?)

 ACL Hardware Resource Utilization (Mod 1) ---------------------------------------------------------- Used Free Percent Utilization ------------------------------------------------------------------- Ingress IPv4 PACL 3 509 0.58 Ingress IPv4 Port QoS 4 252 1.56 Ingress IPv4 RACL 32 480 6.25 Egress IPv4 RACL 3 253 1.17 SUP COPP 214 42 83.59 SUP COPP Reason Code TCAM 8 120 6.25 Redirect 7 505 1.36 Ingress Ether ACL 15 241 5.85 VPC Convergence 1 255 0.39 sFlow Northstar ACL 0 256 0.00 LOU 2 22 8.33 Both LOU Operands 2 Single LOU Operands 0 LOU L4 src port: 1 LOU L4 dst port: 1 LOU L3 packet len: 0 LOU IP tos: 0 LOU IP dscp: 0 LOU ip precedence: 0 LOU ip TTL: 0 TCP Flags 0 16 0.00 Protocol CAM 2 244 0.81 Mac Etype/Proto CAM 0 14 0.00 L4 op labels, Tcam 0 0 1023 0.00 L4 op labels, Tcam 2 1 62 1.58 L4 op labels, Tcam 6 0 2047 0.00 

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