hardware access-list tcam region svi 0 (SVI COUNTERS NEXUS)

[sergioordaz6366]

Hello I am trying to figured out why the SVI counters are 0 for this interface, we found that:

LEAF-3# show running-config all | i svi
hardware access-list tcam region svi 0

TCAM region SVI is set to 0 but I cant not modify it.

LEAF-3# show hardware access-list tcam region
NAT ACL[nat] size = 0
Ingress PACL [ing-ifacl] size = 256
VACL [vacl] size = 256
Ingress RACL [ing-racl] size = 512
Ingress RBACL [ing-rbacl] size = 512
Ingress L2 QOS [ing-l2-qos] size = 256
Ingress L3/VLAN QOS [ing-l3-vlan-qos] size = 256
Ingress SUP [ing-sup] size = 768
Ingress L2 SPAN filter [ing-l2-span-filter] size = 256
Ingress L3 SPAN filter [ing-l3-span-filter] size = 256
Ingress FSTAT [ing-fstat] size = 256
span [span] size = 0
Egress RACL [egr-racl] size = 256
Egress SUP [egr-sup] size = 256
Ingress Redirect [ing-redirect] size = 256
Egress L2 QOS [egr-l2-qos] size = 0
Egress L3/VLAN QOS [egr-l3-vlan-qos] size = 0
Ingress NBM [ing-nbm] size = 256

Software
BIOS: version 07.56
NXOS: version 9.2(1)
BIOS compile time: 06/08/2016
NXOS image file is: bootflash:///nxos.9.2.1.bin
NXOS compile time: 7/17/2018 16:00:00 [07/17/2018 20:21:19]

Hardware
cisco Nexus9000 93180YC-EX chassis
Intel(R) Xeon(R) CPU @ 1.80GHz with 24632684 kB of memory.
Processor Board ID FDO213633BT

[vedpshar]

Hi Sergioordaz,

If you want to allocate the TCAM space to SVI then You need to free up 512 bytes of TCAM. This will allow you to add TCAM space to SVI.
You can refer below document for TCAM carving on Nexus 9000.
https://www.cisco.com/c/en/us/support/docs/switches/nexus-9000-series-switches/119032-nexus9k-tcam-00.html

PS: Please don't forget to rate and mark as correct answer if this answered your question.

[Andrea Testino]

Hi Sergio,

Unfortunately the N9300-EX platform did not originally support SVI counters due to a HW limitation which is why you cannot change that TCAM value for the SVI region (this was also the case for 1st gen Nexus 9000s). This was documented here and used to be within the Interface Configuration guide as well.

We have now added some limited support for this feature starting in NX-OS 7.0(3)I7(3) which requires the CLI "hardware profile svi flex-stats-enable" to be configured followed by a "copy run start" and "reload". 

Example from my lab below:

93180YC-EX# conf t
Enter configuration commands, one per line. End with CNTL/Z.

93180YC-EX(config)# hardware profile svi flex-stats-enable
Warning!!: When SVI L3 ingress counters are enabled/disabled
Vlan L2 Egress counters will not be supported
Please reload the switch now for the change to take effect.

93180YC-EX(config)# end

93180YC-EX# copy run start ; reload
[########################################] 100%
Copy complete, now saving to disk (please wait)...
Copy complete.
This command will reboot the system. (y/n)?  [n] y

You can then consume the data via the following:

93180YC-EX# show int vlan 50
Vlan50 is up, line protocol is up, autostate enabled
  Hardware is EtherSVI, address is  28ac.9ead.5cb7
  Internet Address is 10.208.50.1/28
  MTU 9100 bytes, BW 1000000 Kbit, DLY 10 usec,
   reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not supported
  ARP type: ARPA
  Last clearing of "show interface" counters never
  L3 in Switched:
    ucast: 5 pkts, 530 bytes

93180YC-EX(config)# show interface snmp-ifindex | i i vlan50
Vlan50          151060530  (0x9010032)

ATESTINI-M-26WU:~ atestini$ snmpwalk -v2c -c public 10.122.140.92 1.3.6.1.2.1.31.1.1.1.6.151060530
IF-MIB::ifHCInOctets.151060530 = Counter64: 530

ATESTINI-M-26WU:~ atestini$ snmpwalk -v2c -c public 10.122.140.92 1.3.6.1.2.1.31.1.1.1.7.151060530
IF-MIB::ifHCInUcastPkts.151060530 = Counter64: 5

[Ataullah]

Dear !

thanks for the helpful post 

i did the same but my cisco Nexus9000 C9396PX got  error while executing  command 

C4-NPCN-NX9K(config)# hardware profile svi flex-stats-enable
^
% Invalid command at '^' marker.
C4-NPCN-NX9K(config)# hardware profile svi-and-si flex-stats-enable
Not supported on this platform, or system not ready

I 've using nxos.9.3.9.bin

please help me 

ataullah.saleem@gmail.com

Ataullah : CCIE#56172 R&S

thanks in advance