Configuring TCAM

Ternary content-addressable memory (TCAM) is a type of high-speed memory that can be entirely searched in a single clock cycle. The term “ternary” refers to the memory's ability to store and query data using three different inputs: 0, 1 and X.

The TCAM stores access control-lists (ACLs) which are ordered sets of rules that you can use to filter your network traffic. Each rule specifies a set of conditions that a packet must satisfy to match the rule. When the device determines that an ACL applies to a packet, it tests the packet against the conditions of all rules. The first matching rule determines whether the packet is permitted or denied. If there is no match, the device applies the applicable implicit rule. The device continues processing packets that are permitted and drops packets that are denied. The egress TCAM size is 1K, divided into four 256 entries.

TCAM space is limited. The choice for what is best for your implementation depends on the specific use.

By default, all TCAM space is already allocated, so you need to decide where you want to 'steal' TCAM space from in order to allocate elsewhere.

Configuring ACL TCAM Region with e-racl TCAM Carving

Configuring ACL TCAM Region with e-racl TCAM Carving

POST http://<mgmt0_IP>/api/mo/sys/pltfm.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "eRaclSize": "256"
}}}]}}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <tcamRegion-items>
      <eRaclSize>256</eRaclSize>
    </tcamRegion-items>
  </pltfm-items>
</System>

Configures the size of the IPv4 egress router ACL (ERACL) TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

The CLI command below is the equivalent to the payload example displayed in the pane on the right. Click the DME tab in the top-left corner of the right pane to view the JSON payload or the YANG tab to view the XML payload.

hardware access-list tcam region e-racl 256

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

For information about using the payloads, see the Cisco Nexus 9000 Series NX-OS Programmability Guide https://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-programming-reference-guides-list.html

Configuring ACL TCAM Region with vpc-convergence TCAM Carving

Configuring ACL TCAM Region with vpc-convergence TCAM Carving

POST http://<mgmt0_IP>/api/mo/sys/pltfm.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "vpcConvergenceSize": "0"
}}}]}}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <tcamRegion-items>
      <vpcConvergenceSize>0</vpcConvergenceSize>
    </tcamRegion-items>
  </pltfm-items>
</System>

Configures the size of the vPC convergence TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware access-list tcam region vpc-convergence 0

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring ACL TCAM Region with racl-lite TCAM Carving

Configuring ACL TCAM Region with racl-lite TCAM Carving

POST http://<mgmt0_IP>/api/node/mo/sys/pltfm/tcamRegion.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "ifaclLiteSize": "256"
}}}]}}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <tcamRegion-items>
      <eRaclSize>256</eRaclSize>
    </tcamRegion-items>
  </pltfm-items>
</System>

Configures the size of the IPv4 RACL lite TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware access-list tcam region racl-lite 256

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring ACL TCAM Region with ipv6-ifacl TCAM Carving

Configuring ACL TCAM Region with ipv6-ifacl TCAM Carving

POST http://<mgmt0_IP>/api/mo/sys/pltfm.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "ipv6IfaclSize": "256"
}}}]}}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <tcamRegion-items>
      <ipv6IfaclSize>256</ipv6IfaclSize>
    </tcamRegion-items>
  </pltfm-items>
</System>

Configures the size of the IPv6 port ACL TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware access-list tcam region ipv6-ifacl 256

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring ACL TCAM Region Size with e-ipv6-racl TCAM Carving

Configuring ACL TCAM Region Size with e-ipv6-racl TCAM Carving

POST http://<mgmt0_IP>/api/mo/sys/pltfm.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "eIpv6RaclSize": "256"
}}}]}}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <tcamRegion-items>
      <eIpv6RaclSize>256</eIpv6RaclSize>
    </tcamRegion-items>
  </pltfm-items>
</System>

Configures the size of the IPv6 egress router ACL (ERACL) TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware access-list tcam region e-ipv6-racl 256

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring ACL TCAM Region with ifacl-lite TCAM Region Size

Configuring ACL TCAM Region with ifacl-lite TCAM Region Size

POST http://<mgmt0_IP>/api/node/mo/sys/pltfm/tcamRegion.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "raclLiteSize": "256"
}}}]}}

{
    imdata:[]
}

Configures the size of the IPv4 port ACL lite TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

The CLI command below is the equivalent to the payload example displayed in the pane on the right.

hardware access-list tcam region ifacl-lite 256

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring Max-Host Routing Mode

Configuring Max-Host Routing Mode

POST http://<mgmt0_IP>/api/mo/sys.json

{
  "topSystem": {
    "children": [
      {
        "platformEntity": {
          "attributes": {
            "routingMode": "TOR_MAX_L3"
          }
        }
      }
    ]
  }
}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <routingMode>TOR_MAX_L3</routingMode>
  </pltfm-items>
</System>

Puts the line cards in Broadcom T2 mode 2 and the fabric modules in Broadcom T2 mode 3 to increase the number of supported hosts.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

system routing max-mode l3

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring ALPM for IPv6

Configuring ALPM for IPv6

POST http://<mgmt0_IP>/api/mo/sys.json

{
  "topSystem": {
    "children": [
      {
        "platformEntity": {
          "attributes": {
            "IPV6alpmCarveValue": "4096"
          }
        }
      }
    ]
  }
}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <IPV6alpmCarveValue>4096</IPV6alpmCarveValue>
  </pltfm-items>
</System>

Enables /128 IPv6 routes and carves the LPM table for all IPv6 entries.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware profile ipv6 alpm carve-value 4096

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Enabling the SCP Server

Enabling the SCP Server

POST http://<mgmt0_IP>/api/mo/sys/fm.json

{
  "fmEntity": {
    "children": [
      {
        "fmScpServer": {
          "attributes": {
            "adminSt": "enabled"
}}}]}}

{
    imdata:[]
}

<System>
  <fm-items>
    <scpserver-items>
      <adminSt>enabled</adminSt>
    </scpserver-items>
  </fm-items>
</System>

Enables the scp-server feature.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

feature scp-server

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring anycast gateway MAC

Configuring anycast gateway MAC

POST http://<mgmt0_IP>/api/mo/sys/hmm.json

{
  "hmmEntity": {
    "children": [
      {
        "hmmFwdInst": {
          "attributes": {
            "amac": "CA:BB:D3:69:0C:60"
}}}]}}

{
    imdata:[]
}

<System>
  <hmm-items>
    <fwdinst-items>
      <amac>CA:BB:D3:69:0C:60</amac>
    </fwdinst-items>
  </hmm-items>
</System>

Configures anycast gateway MAC of the switch.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

fabric forwarding anycast-gateway-mac cabb.d369.0c60

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring description for VRF

Configuring description for VRF

POST http://<mgmt0_IP>/api/mo/sys.json

{
  "topSystem": {
    "children": [
      {
        "l3Inst": {
          "attributes": {
            "descr": "Default VRF for user L3 routing shutdown",
            "name": "switchpool-default"
          }
        }
      }
    ]
  }
}

{
    imdata:[]
}

<System>
  <inst-items>
    <Inst-list>
      <name>switchpool-default</name>
      <descr>Default VRF for user L3 routing shutdown</descr>
    </Inst-list>
  </inst-items>
</System>

Creates a description of the VRF.

Note: This example was added in Release 7.0(3)I6(1).

CLI Commands

The CLI commands and options listed below are the equivalent to the payload examples displayed in the pane on the right. Click the DME tab in the top-left corner of the right pane to view the JSON payload or the YANG tab to view the XML payload.

vrf context switchpool-default
description Default VRF for user L3 routing shutdown

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring MOTD Banner

POST http://<mgmt0_IP>/api/mo/sys/userext.json

{
  "aaaUserEp": {
    "children": [
      {
        "aaaPreLoginBanner": {
          "attributes": {
            "delimiter": "_",
            "message": ""
}}}]}}

{
    imdata:[]
}

<System>
  <userext-items>
    <preloginbanner-items>
      <delimiter>_</delimiter>
      <message></message>
    </preloginbanner-items>
  </userext-items>
</System>

Configures the MOTB (message-of-the-day) banner.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

banner motd __

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring BFD Interval

Configuring BFD Interval

POST http://<mgmt0_IP>/api/mo/sys/bfd/inst/if-{[id]}.json

{
  "bfdIf": {
    "attributes": {
      "id": "eth1/1"
    },
    "children": [
      {
        "bfdKaP": {
          "attributes": {
            "detectMult": "3",
            "minRxIntvl": "50",
            "minTxIntvl": "50"
}}}]}}

{
    imdata:[]
}

<System>
  <bfd-items>
    <inst-items>
      <if-items>
        <If-list>
          <id>eth1/1</id>
          <ka-items>
            <detectMult>3</detectMult>
            <minRxIntvl>50</minRxIntvl>
            <minTxIntvl>50</minTxIntvl>
          </ka-items>
        </If-list>
      </if-items>
    </inst-items>
  </bfd-items>
</System>

Configures the BFD session parameters for all BFD sessions on the device. This command overrides these values by configuring the BFD session parameters on an interface.

Note: This example was added in Release 7.0(3)I6(1).

CLI Commands

interface ethernet1/1
bfd interval 50 min_rx 50 multiplier 3

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring Hardware Profile racl TCAM Region Size

Configuring Hardware Profile racl TCAM Region Size

POST http://<mgmt0_IP>/api/mo/sys/pltfm.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "raclSize": "3072"
}}}]}}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <tcamRegion-items>
      <raclSize>3072</raclSize>
    </tcamRegion-items>
  </pltfm-items>
</System>

Configures the size of the router ACL (RACL) TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware profile tcam region racl 3072

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring Hardware Profile QoS TCAM Region Size

Configuring Hardware Profile QoS TCAM Region Size

POST http://<mgmt0_IP>/api/mo/sys/pltfm.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "qosSize": "256"
}}}]}}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <tcamRegion-items>
      <qosSize>256</qosSize>
    </tcamRegion-items>
  </pltfm-items>
</System>

Configures the size of the quality of service (QoS) TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware profile tcam region qos 256

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring Hardware Profile e-vacl TCAM Region Size

Configuring Hardware Profile e-vacl TCAM Region Size

POST http://<mgmt0_IP>/api/mo/sys/pltfm.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "eVaclSize": "0"
}}}]}}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <tcamRegion-items>
      <eVaclSize>0</eVaclSize>
    </tcamRegion-items>
  </pltfm-items>
</System>

Configures the size of the egress VLAN ACL (EVACL) TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware profile tcam region e-vacl 0

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring Hardware Profile ifacl TCAM Region Size

Configuring Hardware Profile ifacl TCAM Region Size

POST http://<mgmt0_IP>/api/mo/sys/pltfm.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "ifaclSize": "0"
}}}]}}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <tcamRegion-items>
      <ifaclSize>0</ifaclSize>
    </tcamRegion-items>
  </pltfm-items>
</System>

Configures the size of the interface ACL (ifacl) TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware profile tcam region ifacl 0

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring Hardware Profile vacl TCAM Region Size

The following is an example of configuring the vacl TCAM region in the hardware.

Configuring Hardware Profile vacl TCAM Region Size

POST http://<mgmt0_IP>/api/mo/sys/pltfm.json

{
  "platformEntity": {
    "children": [
      {
        "platformTcamRegion": {
          "attributes": {
            "vaclSize": "0"
}}}]}}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <tcamRegion-items>
      <vaclSize>0</vaclSize>
    </tcamRegion-items>
  </pltfm-items>
</System>

Configures the size of the VLAN ACL (VACL) TCAM region.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware profile tcam region vacl 0

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring Hardware QoS Min-buffer

Configuring Hardware QoS Min-buffer

POST http://<mgmt0_IP>/api/mo/sys.json

{
  "topSystem": {
    "children": [
      {
        "platformEntity": {
          "attributes": {
            "qosMinBuffer": "default"
          }
        }
      }
    ]
  }
}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <qosMinBuffer>default</qosMinBuffer>
  </pltfm-items>
</System>

Configures the QoS buffer.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

hardware qos min-buffer qos-group default

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Disabling URPF (Unicast Reverse Path Forwarding)

The following is an example of (global) disabling Unicast Reverse Path Forwarding (URPF).

Disabling URPF (Unicast Reverse Path Forwarding)

POST http://<mgmt0_IP>/api/mo/sys.json

{
  "topSystem": {
    "children": [
      {
        "platformEntity": {
          "attributes": {
            "urpfStatus": "disabled"
          }
        }
      }
    ]
  }
}

{
    imdata:[]
}

<System>
  <pltfm-items>
    <urpfStatus>disabled</urpfStatus>
  </pltfm-items>
</System>

Globally disables URPF.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

system urpf disable

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring Logging Level to Match Entries in ACL Log

Configuring Logging Level to Match Entries in ACL Log

POST http://<mgmt0_IP>/api/mo/sys.json

{
  "acllogInst": {
    "children": [
      {
        "acllogLogCache": {
          "attributes": {
            "matchLevel": "6"
}}}]}}

{
    imdata:[]
}

<System>
  <acllog-items>
    <inst-items>
      <log-items>
        <matchLevel>6</matchLevel>
      </log-items>
    </inst-items>
  </acllog-items>
</System>

Specifies the minimum severity level to log ACL matches. The default is 6 (informational). The range is from 0 (emergency) to 7 (debugging).

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

acllog match-log-level 6

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

Configuring TFTP Source Interface

Configuring TFTP Source Interface

POST http://<mgmt0_IP>/api/mo/sys/ipSrcIf.json

{
  "srcintfEntity": {
    "children": [
      {
        "srcintfTftp": {
          "attributes": {
            "srcIf": "po4",
            "vrf": "default"
}}}]}}

{
    imdata:[]
}

<System>
  <ipSrcIf-items>
    <tftp-items>
      <Tftp-list>
        <vrf>default</vrf>
        <srcIf>po4</srcIf>
      </Tftp-list>
    </tftp-items>
  </ipSrcIf-items>
</System>

Configures the source interface for all TFTP packets.

Note: This example was added in Release 7.0(3)I6(1).

CLI Command

ip tftp source-interface po4 vrf default

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference: http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload: https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/