Editing Classic LAN Fabric Settings

 
Updated August 14, 2025
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New and changed information

The following table provides an overview of the significant changes up to this current release. The table does not provide an exhaustive list of all changes or of the new features up to this release.

Release Version Feature Description

Nexus Dashboard 4.1.1

Improved navigation and workflow when editing Classic LAN fabric settings.

Beginning with Nexus Dashboard 4.1.1, the navigation and workflow when editing Classic LAN fabric settings in Nexus Dashboard have been enhanced.

Editing Classic LAN fabric settings

A Classic LAN fabric is a type of fabric used for Access-Aggregation-Core Classic LAN architectures, based on Cisco best practices with Nexus 3000/7000/9000 switches. This fabric type supports the Access and Aggregation switch roles. Switches that serve as Core for these networks must be deployed in the External and inter-fabric connectivity fabric type.

When you first create a classic fabric using the procedures provided in Creating LAN and ACI Fabrics and Fabric Groups, the standard workflow allows you to create a fabric using the bare minimum settings so that you are able to create a fabric quickly and easily. Use the procedures in this article to make more detailed configurations for your classic fabric.

  1. Navigate to the main Fabrics window:

    Manage > Fabrics

  2. Locate the Classic LAN fabric that you want to edit.

    Classic LAN fabrics are shown with Classic in the Type column.

  3. Click the circle next to the Classic LAN fabric that you want to edit to select that fabric, then click Actions > Edit Fabric Settings.

    The Edit fabric_name Settings window appears.

  4. Click the appropriate tab to edit these settings for the fabric:

General

Use the information in this section to edit the settings in the General window for your Classic LAN fabric.

Change the general parameters that you configured previously for the Classic LAN fabric, if necessary, or click another tab to leave these settings unchanged.

Field Description

Name

The name for the fabric. This field is not editable.

Type

The fabric type for this fabric. This field is not editable.

Location

Choose the location for the fabric.

VRF-Lite Protocol

Specifies the VRF-Lite Agg-Core/Edge or Collapsed Core-WAN peering protocol options. Options are:

  • EBGP

  • OSPF

  • None: Nexus Dashboard does not configure the peering protocol if the None option is selected. You must manually configure the peering protocol with this option, if necessary.

BGP ASN

Enter the BGP autonomous system number (ASN) for the fabric’s spine switches.

License tier

Choose the licensing tier for the fabric:

  • Essentials

  • Advantage

  • Premier

Click on the information icon (i) next to License tier to see what functionality is enabled for each license tier.

Enabled features

Check the box to enable Telemetry for the fabric. This is the equivalent of enabling the Nexus Dashboard Insights service in previous releases.

Telemetry collection

This option becomes available if you choose to enable Telemetry in the Enable features field above.

Choose either Out-of-band or In-band for telemetry collection.

Telemetry streaming

This option becomes available if you choose to enable Telemetry in the Enable features field above.

Choose either IPv4 or IPv6 for telemetry streaming.

Security domain

Choose the security domain for the fabric.

Fabric Management

Use the information in this section to edit the settings in the Fabric management page for your Classic LAN fabric. The following sections describe each tab and its respective fields. These tabs include the fabric-level parameters.

General Parameters

The General Parameters tab is displayed by default. The fields in this tab are described in the following table.

Field Description

First Hop Redundancy Protocol

Specifies the FHRP protocol. Options are:

  • none: Select this option if you want Layer 2 only.

  • hsrp

  • vrrp

  • vrrpv3

Enable Performance Monitoring

Check the check box to enable performance monitoring.

Ensure that you do not clear interface counters from the Command Line Interface of the switches. Clearing interface counters can cause the Performance Monitor to display incorrect data for traffic utilization. If you must clear the counters and the switch has both clear counters and clear counters snmp commands (not all switches have the clear counters snmp command), ensure that you run both the main and the SNMP commands simultaneously. For example, you must run the clear counters interface ethernet slot/port command followed by the clear counters interface ethernet slot/port snmp command. This can lead to a one time spike.

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

Spanning Tree

The fields in the Spanning Tree tab are described in the following table. All of the fields are automatically populated based on Cisco-recommended best practice configurations, but you can update the fields if needed.

Field Description

Spanning Tree Root Bridge Protocol

Specify the protocol to be used for configuring Root Bridge: Options are:

  • rpvst+: Rapid Per-VLAN Spanning Tree

  • mst: Multiple Spanning Tree

  • unmanaged (default): STP Root not managed by Nexus Dashboard

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Spanning Tree settings and bridge configurations are applicable at the Aggregation layer only.

Spanning Tree VLAN Range

Specify the VLAN range. For example:

1, 3-5, 7, 9-11

The default value is 1-3967. Applicable only for Aggregation devices.

MST Instance Range

Specify the MST instance range. For example:

0-3,5,7-9

The default value is 0. Applicable only for Aggregation devices.

Spanning Tree Bridge Priority

Specify the bridge priority for the spanning tree in increments of 4096. Applicable only for Aggregation devices.

Spanning Tree Hello Interval

Set the number of seconds between the generation of config spanning-tree Bridge Protocol Data Unit (BPDU).

The default value is 2. Applicable only for Aggregation devices.

Spanning Tree Forward Delay

Set the number of seconds for the forward delay timer.

The default value is 15. Applicable only for Aggregation devices.

Spanning Tree Max Age Interval

Set the maximum number of seconds the information in a spanning-tree Bridge Protocol Data Unit (BPDU) is valid.

The default value is 20. Applicable only for Aggregation devices.

Spanning Tree Pathcost Method

Options are:

  • short: (default): Use 16-bit based values for default port path costs

  • long: Use 32-bit based values for default port path costs

Applicable only for Aggregation devices.

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

vPC

The fields in the vPC tab are described in the following table. All of the fields are automatically populated based on Cisco-recommended best practice configurations, but you can update the fields if needed.

Field Description

vPC Auto Recovery Time

Specifies the vPC auto recovery time-out period in seconds.

  • Minimum value: 240

  • Maximum value: 3600

vPC Delay Restore Time

Specifies the vPC delay restore period in seconds.

  • Minimum value: 1

  • Maximum value: 3600

vPC Peer Link Port Channel ID

Specifies the Port Channel ID for a vPC Peer Link. Default value in this field is 500.

  • Minimum value: 1

  • Maximum value: 4096

vPC IPv6 ND Synchronize

Enables IPv6 Neighbor Discovery synchronization between vPC switches. The check box is enabled by default. Uncheck the check box to disable the function.

vPC Domain Id Range

Specifies the vPC Domain Id range to use for new pairings.

vPC Layer-3 Peer-Router Option

Enables the Layer 3 device to form peering adjacency with both the peers.

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Configure this command in both the peers. If you configure this command only on one of the peers or you disable it on one peer, the operational state of layer 3 peer-router gets disabled. You get a notification when there is a change in the operational state.

Use Specific vPC/Port-Channel ID Range

Enable this check box to use a specific vPC/port-channel ID range for aggregation-access pairing.

vPC/Port-Channel ID Range

Specifies one vPC/port-channel ID range for auto-allocating vPC/port-channel IDs for aggregation-access pairing. The minimum allowed value is 1 and the maximum allowed value is 4096.

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

Protocols

The fields in the Protocols tab are described in the following table. Most of the fields are automatically populated based on Cisco-recommended best practice configurations, but you can update the fields if needed.

Field Description

OSPF Process Tag

This field becomes editable if you selected ospf in the Routing Protocol field under the General Parameters tab.

The OSPF Routing Process Tag. Maximum size is 20.

OSPF Area ID

This field becomes editable in these conditions:

  • If you selected ospf in the Routing Protocol field under the General Parameters tab.

  • If you enter a value in the OSPF Process Tag field above.

The OSPF Area ID in an IP address format.

OSPFv3 Process Tag

This field becomes editable if you selected ospf in the Routing Protocol field under the General Parameters tab.

The OSPFv3 Routing Process Tag. Maximum size is 20.

OSPFv3 Area ID

This field becomes editable in these conditions:

  • If you selected ospf in the Routing Protocol field under the General Parameters tab.

  • If you enter a value in the OSPFv3 Process Tag field above.

The OSPFv3 Area ID in an IP address format.

Enable BGP Authentication

This field becomes editable if you selected ebgp in the Routing Protocol field under the General Parameters tab.

Select the check box to enable BGP authentication. Deselect the check box to disable it. If you enable this field, the BGP Password Key Encryption Type and BGP Neighbor Password fields are enabled.

BGP Password Key Encryption Type

This field becomes editable in these conditions:

  • If you selected ebgp in the Routing Protocol field under the General Parameters tab.

  • If you enabled the Enable BGP Authentication field above.

Choose the 3 for 3DES encryption type, or 7 for Cisco encryption type.

BGP Neighbor Password

This field becomes editable in these conditions:

  • If you selected ebgp in the Routing Protocol field under the General Parameters tab.

  • If you enabled the Enable BGP Authentication field above.

Enter the VRF Lite BGP neighbor password as a hex string.

Enable OSPF Authentication

This field becomes editable if you selected ospf in the Routing Protocol field under the General Parameters tab.

Select the check box to enable OSPF authentication. Deselect the check box to disable it. If you enable this field, the OSPF Authentication Key ID and OSPF Authentication Key fields get enabled.

OSPF Authentication Key ID

This field becomes editable in these conditions:

  • If you selected ospf in the Routing Protocol field under the General Parameters tab.

  • If you enabled the Enable OSPF Authentication field above.

The Key ID is populated.

OSPF Authentication Key

This field becomes editable in these conditions:

  • If you selected ospf in the Routing Protocol field under the General Parameters tab.

  • If you enabled the Enable OSPF Authentication field above.

The OSPF authentication key must be the 3DES key from the switch. NOTE: Plain text passwords are not supported. Log in to the switch, retrieve the encrypted key and enter it in this field. For more information, see the Retrieving the Authentication Key section for details.

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

Security

The fields on the Security tab are described in the following table.

For more information on configuring data center interconnect (DCI) MACsec, see Connecting Two Fabrics with MACsec Using QKD.

Field Description

Enable DCI MACsec

Check the check box to enable MACsec on DCI links.

Enable QKD

Check the check box to enable the QKD server for generating quantum keys for encryption.

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If you choose to not enable the Enable QKD option, Nexus Dashboard uses preshared keys provided by the user instead of using the QKD server to generate the keys. If you disable the Enable QKD option, all the fields pertaining to QKD are grayed out.

DCI MACsec Cipher Suite

Choose one of the following DCI MACsec cipher suites for the DCI MACsec policy:

  • GCM-AES-128

  • GCM-AES-256

  • GCM-AES-XPN-128

  • GCM-AES-XPN-256

The default value is GCM-AES-XPN-256.

DCI MACsec Primary Key String

Specify a Cisco Type 7 encrypted octet string that is used for establishing the primary DCI MACsec session. For AES_256_CMAC, the key string length must be 130 and for AES_128_CMAC, the key string length must be 66. If these values are not specified correctly, an error is displayed when you save the fabric.

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The default key lifetime is infinite.

DCI MACsec Primary Cryptographic Algorithm

Choose the cryptographic algorithm used for the primary key string. It can be AES_128_CMAC or AES_256_CMAC. The default value is AES_128_CMAC.

You can configure a fallback key on the device to initiate a backup session if the primary session fails.

DCI MACsec Fallback Key String

Specify a Cisco Type 7 encrypted octet string that is used for establishing a fallback MACsec session. For AES_256_CMAC, the key string length must be 130 and for AES_128_CMAC, the key string length must be 66. If these values are not specified correctly, an error is displayed when you save the fabric.

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This parameter is mandatory if the Enable QKD option is not selected.

DCI MACsec Fallback Cryptographic Algorithm

Choose the cryptographic algorithm used for the fallback key string. It can be AES_128_CMAC or AES_256_CMAC. The default value is AES_128_CMAC.

QKD Profile Name

Specify the crypto profile name.

The maximum size is 63.

KME Server IP

Specify the IPv4 address for the Key Management Entity (KME) server.

KME Server Port Number

Specify the port number for the KME server.

Trustpoint Label

Specify the authentication type trustpoint label.

The maximum size is 64.

Ignore Certificate

Enable this check box to skip verification of incoming certificates.

DCI MACsec Status Report Timer

Specify the DCI MACsec operational status periodic report timer in minutes.

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

Advanced

The fields in the Advanced tab are described in the following table. All of the fields are automatically populated based on Cisco-recommended best practice configurations, but you can update the fields if needed.

Field Description

VRF Template

Specifies the VRF template for creating VRFs. These are pre-built, best practice templates for VRFs that are provided with Nexus Dashboard. You do not have to specify a template but one is automatically selected.

Network Template

Specifies the network template for creating networks. These are pre-built, best practice templates for networks that are provided with Nexus Dashboard. You do not have to specify a template but one is automatically selected.

Layer 2 Host Interface MTU

Specifies the MTU for the layer 2 host interface. This value should be an even number.

Unshut Host Interfaces by Default

Check this check box to unshut the host interfaces by default.

Power Supply Mode

Choose the appropriate power supply mode.

CoPP Profile

Choose the appropriate control plane policing (CoPP) profile for the fabric. These profiles are available.

  • dense

  • lenient

  • moderate

  • strict

  • manual

The manual option is chosen by default.

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In general, a fabric-wide CoPP policy is applied to Nexus switches. If manual option is chosen, a customized CoPP profile policy must be defined separately.

Brownfield Network Name Format

Enter the format to be used to build the overlay network name during a brownfield import or migration. The network name should not contain any white spaces or special characters except underscore and hyphen. The network name must not be changed once the brownfield migration has been initiated. See the Creating Networks for the Standalone Fabric section for the naming convention of the network name.

The syntax is [<string> | VLAN_ID] and the default value is Auto_Net_VLANVLAN_ID. When you create networks, the name is generated according to the syntax you specify.

The following list describes the variables in the syntax:

  • VLAN_ID: Specifies the VLAN ID associated with the network.

    VLAN ID is specific to switches, hence Nexus Dashboard Fabric Controller picks the VLAN ID from one of the switches, where the network is found, randomly and use it in the name.

    We recommend not to use this unless the VLAN ID is consistent across the fabric.

  • <string>: This variable is optional and you can enter any number of alphanumeric characters that meet the network name guidelines.

An example overlay network name: Site_VLAN1234

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Ignore this field for greenfield deployments.

Enable CDP for Bootstrapped Switch

Enables CDP on management (mgmt0) interface for bootstrapped switch. By default, for bootstrapped switches, CDP is disabled on the mgmt0 interface.

Enable Tenant DHCP

Check the check box to enable feature dhcp and associated configurations globally on all switches in the fabric. This is a pre-requisite for support of DHCP for overlay networks that are part of the tenant VRFs.

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Ensure that Enable Tenant DHCP is enabled before enabling DHCP-related parameters in the overlay profiles.

Enable NX-API

Specifies enabling of NX-API on HTTPS.

NX-API HTTPS Port Number

Field becomes active if the Enable NX-API option is enabled.

Enter the NX-API HTTPS port number. Default value is 443.

Enable HTTP NX-API

Specifies enabling of NX-API on HTTP. Enable this check box and the Enable NX-API check box to use HTTP. This check box is checked by default. If you uncheck this check box, the applications that use NX-API and supported by Cisco Nexus Dashboard Fabric Controller, such as Endpoint Locator (EPL), Layer 4-Layer 7 services (L4-L7 services), VXLAN OAM, and so on, start using HTTPS instead of HTTP.

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If you check the Enable NX-API check box and the Enable NX-API on HTTP check box, applications use HTTP.

NX-API HTTP Port Number

Field becomes active if the Enable HTTP NX-API option is enabled.Enter the NX-API HTTPS port number. Default value is 80.

Enable Strict Config Compliance

Enable the Strict Config Compliance feature by selecting this check box. It enables bi-directional compliance checks to flag additional configs in the running config that are not in the intent/expected config. By default, this feature is disabled.

Enable AAA IP Authorization

Enables AAA IP authorization, when IP Authorization is enabled in the remote authentication server. This is required to support Nexus Dashboard Fabric Controller in scenarios where customers have strict control of which IP addresses can have access to the switches.

Enable Nexus Dashboard as Trap Host

Select this check box to enable Nexus Dashboard Fabric Controller as an SNMP trap destination. Typically, for a native HA Nexus Dashboard Fabric Controller deployment, the eth1 VIP IP address will be configured as SNMP trap destination on the switches. By default, this check box is enabled.

Enable Agg/Access Auto Pairing

For back-to-back vPCs, enable this option to automatically pair aggregation and access devices based on topology.

Create Route-map fabric-rmap-redist-subnet

Enable this option to create a route map fabric-rmap-redist-subnet. This route-map matches tag 12345.

Greenfield Cleanup Option

Enable this field to clean the switch configuration without a reloads when PreserveConfig=no. Valid options are Enable or Disable.

Aggregation Freeform Config

Additional CLIs for all Aggregation devices as captured from show running configuration.

Access Freeform Config

Additional CLIs for all Access devices as captured from show running configuration.

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

Resources

The fields in the Resources tab are described in the following table. Most of the fields are automatically populated based on Cisco-recommended best practice configurations, but you can update the fields if needed.

Field Description

Network VLAN Range

VLAN range for the per switch overlay network (min:2, max:4094).

Aggregation-Core/Aggregation-Edge Connectivity

Specify the option for the VRF Lite Aggregation-Core and Aggregation-Edge Router Inter-Fabric connection. Options are:

  • Auto: Automatically generates the VRF Lite configuration on the Aggregation and Core switches. This option is applicable only if you are using the Cisco Nexus 7000 or 9000 Series switches for the Core layer.

  • Manual: If you are using the Cisco Catalyst 9000 series switches or Cisco ASR 9000 Series Aggregation Services Routers for the Core layer, select Manual in this field. You must manually create a policy using the necessary policy provided to you through Nexus Dashboard. For more information, see VRF Lite.

VRF-Lite Subinterface dot1q Range

Specifies the per Aggregation dot1q Range for VRF Lite connectivity (min:2, max:4093).

Auto Generate VRF Lite Configuration on Aggregation and Core/Edge

Option that controls the automatic generation of the VRF Lite sub-interface and peering configurations on the Aggregation & Core/Edge devices. When this option is enabled, the automatically created VRF Lite links will have the 'Auto Generate Flag' enabled.

VRF Lite IP Version

Select the IP version for VRF Lite.Options are:

  • IPv4_only

  • IPv6_only

  • IPv4_and_IPv6

IPv4 VRF Subnet IP Range and IPv4 VRF Subnet Mask Length

The IPv4 address range to assign peer-to-peer Aggregation-Core connections, and peering between vPC Aggregation switches.

Update the fields as needed. The values shown in your screen are automatically generated.

If you want to update the IP address ranges or the VRF/Network VLAN ranges, ensure that it does not overlap with other ranges. You should only update one range of values at a time. If you want to update more than one range of values, do it in separate instances. For example, if you want to update Layer 2 and Layer 3 ranges, you should do the following:

  1. Update the Layer 2 range and click Save.

  2. Click the Edit Fabric option again, update the Layer 3 range and click Save.

IPv6 VRF Subnet IP Range and IPv6 VRF Subnet Mask Length

The IPv6 address range to assign peer-to-peer Aggregation-Core connections, and peering between vPC Aggregation switches.

Update the fields as needed. The values shown in your screen are automatically generated. If you want to update the IP address ranges or the VRF/Network VLAN ranges, ensure that it does not overlap with other ranges. You should only update one range of values at a time. If you want to update more than one range of values, do it in separate instances. For example, if you want to update Layer 2 and Layer 3 ranges, you should do the following:

  1. Update the Layer 2 range and click Save.

  2. Click the Edit Fabric option again, update the Layer 3 range and click Save.

VRF Lite VLAN Range

VLAN range for Per VRF SVI Peering between Aggregation pairs (min:2, max:4094).

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

Manageability

The fields in the Manageability tab are described in the following table. Most of the fields are automatically populated based on Cisco-recommended best practice configurations, but you can update the fields if needed.

Field Description

DNS Server IPs

Specifies the comma separated list of IP addresses (v4/v6) of the DNS servers.

DNS Server VRFs

Specifies one VRF for all DNS servers or a comma separated list of VRFs, one per DNS server.

NTP Server IPs/Hostnames

Specifies a comma-separated list of IP addresses (IPv4/IPv6) or hostnames for the NTP server. Hostnames are limited to 80 characters in length and must not contain any whitespace or special characters, except for hyphens (-) and periods (.).

NTP Server VRFs

Specifies one VRF for all NTP servers or a comma separated list of VRFs, one per NTP server.

Syslog Server IPs/Hostnames

Specifies a comma-separated list of IP addresses (IPv4/IPv6) or hostnames for the Syslog server. Hostnames are limited to 199 characters in length and should not contain any whitespace or special characters, except for hyphens (-) and periods (.).

Syslog Server Severity

Specifies the comma separated list of syslog severity values, one per syslog server. The minimum value is 0 and the maximum value is 7. To specify a higher severity, enter a higher number.

Syslog Server VRFs

Specifies one VRF for all syslog servers or a comma separated list of VRFs, one per syslog server.

AAA Freeform Config

Specifies the AAA freeform configurations.

If AAA configurations are specified in the fabric settings, switch_freeform PTI with source as UNDERLAY_AAA and description as AAA Configurations will be created.

Banner

Specifies the message of the day banner.

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

Bootstrap

The fields in the Bootstrap tab are described in the following table. Most of the fields are automatically populated based on Cisco-recommended best practice configurations, but you can update the fields if needed.

Field Description

Enable Bootstrap

Select this check box to enable the bootstrap feature. Bootstrap allows easy day-0 import and bring-up of new devices into an existing fabric. Bootstrap leverages the NX-OS POAP functionality.

To add more switches and for POAP capability, chose check box for Enable Bootstrap and Enable Local DHCP Server.

After you enable bootstrap, you can enable the DHCP server for automatic IP address assignment using one of the following methods:

  • External DHCP Server: Enter information about the external DHCP server in the Switch Mgmt Default Gateway and Switch Mgmt IP Subnet Prefix fields.

  • Local DHCP Server: Enable the Local DHCP Server check box and enter details for the remaining mandatory fields.

Enable Local DHCP Server

Select this check box to initiate enabling of automatic IP address assignment through the local DHCP server. When you select this check box, the DHCP Scope Start Address and DHCP Scope End Address fields become editable.

If you do not select this check box, Nexus Dashboard Fabric Controller uses the remote or external DHCP server for automatic IP address assignment.

DHCP Version

Select DHCPv4 or DHCPv6 from this drop-down list. When you select DHCPv4, the Switch Mgmt IPv6 Subnet Prefix field is disabled. If you select DHCPv6, the Switch Mgmt IP Subnet Prefix is disabled.

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Cisco Nexus 9000 and 3000 Series Switches support IPv6 POAP only when switches are either Layer-2 adjacent (eth1 or out-of-band subnet must be a /64) or they are L3 adjacent residing in some IPv6 /64 subnet. Subnet prefixes other than /64 are not supported.

DHCP Scope Start Address and DHCP Scope End Address

Specifies the first and last IP addresses of the IP address range to be used for the switch out of band POAP.

Switch Mgmt Default Gateway

Specifies the default gateway for the management VRF on the switch.

Switch Mgmt IP Subnet Prefix

Specifies the prefix for the Mgmt0 interface on the switch. The prefix should be between 8 and 30.

DHCP scope and management default gateway IP address specification: If you specify the management default gateway IP address 10.0.1.1 and subnet mask 24, ensure that the DHCP scope is within the specified subnet, between 10.0.1.2 and 10.0.1.254.

DHCPv4 Multi Subnet Scope

Specifies the field to enter one subnet scope per line. This field is editable after you check the Enable Local DHCP Server check box.The format of the scope should be defined as:

DHCP Scope Start Address, DHCP Scope End Address, Switch Management Default Gateway, Switch Management Subnet Prefix

For example: 10.6.0.2, 10.6.0.9, 10.6.0.1, 24

Enable AAA Config

Select this check box to include AAA configurations from the Manageability tab as part of the device start-up config post bootstrap.

Bootstrap Freeform Config

(Optional) Enter additional commands as needed. For example, if you require some additional configurations to be pushed to the device and be available post device bootstrap, they can be captured in this field, to save the desired intent. After the devices boot up, they will contain the configuration defined in the Bootstrap Freeform Config field.

Copy-paste the running-config to a freeform config field with correct indentation, as seen in the running configuration on the NX-OS switches. The freeform config must match the running config. For more information, see Enabling Freeform Configurations on Fabric Switches.

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

Configuration Backup

The fields in the Configuration Backup tab are described in the following table. Most of the fields are automatically populated based on Cisco-recommended best practice configurations, but you can update the fields if needed.

Field Description

Hourly Fabric Backup

Select the check box to enable an hourly backup of fabric configurations and the intent. The hourly backups are triggered during the first 10 minutes of the hour.

Scheduled Fabric Backup

Check the check box to enable a daily backup. This backup tracks changes in running configurations on the fabric devices that are not tracked by configuration compliance.

Scheduled Time

Specify the scheduled backup time in a 24-hour format. This field is enabled if you check the Scheduled Fabric Backup check box.

Select both the check boxes to enable both back up processes. The backup process is initiated after you click Save.

The scheduled backups are triggered exactly at the time you specify with a delay of up to two minutes. The scheduled backups are triggered regardless of the configuration deployment status.

You can enter the number of fabric backups that will be retained on Nexus Dashboard in Admin > System Settings > Fabric management > Advanced settings > LAN-Fabric > Maximum Backups per Fabric. Default is 2.

The number of archived files that can be retained is set in the # Number of archived files per device to be retained: field in the Server Properties page.

Note: To trigger an immediate backup, do the following:

  1. Choose Overview > Topology.

  2. Click within the specific fabric box. The fabric topology screen comes up.

  3. Right-click on a switch within the fabric, then select Preview Config.

  4. On the Preview Config page for this fabric, click Re-Sync All.

You can also initiate the fabric backup on the fabric topology page. Click Backup Now in the Actions pane.

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

Flow Monitor

The fields in the Flow Monitor tab are described in the following table. Most of the fields are automatically populated based on Cisco-recommended best practice configurations, but you can update the fields if needed.

Field Description

Enable Netflow

Check this check box to enable Netflow on Aggregation devices for this fabric. By default, Netflow is disabled. On Enable, NetFlow configuration will be applied to all Aggregation devices that support Netflow.

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When Netflow is enabled on the fabric, you can choose not to have netflow on a particular switch by having a dummy no_netflow PTI.

If netflow is not enabled at the fabric level, an error message is generated when you enable netflow at the interface, network, or VRF level. For information about Netflow support for Nexus Dashboard, see the "Configuring Netflow support" section in Creating LAN and ACI Fabrics and Fabric Groups.

In the Netflow Exporter area, click Actions > Add to add one or more Netflow exporters. This exporter is the receiver of the netflow data. The fields on this screen are:

Field Description

Exporter Name

Specifies the name of the exporter.

IP

Specifies the IP address of the exporter.

VRF

Specifies the VRF over which the exporter is routed.

Source Interface

Enter the source interface name.

UDP Port

Specifies the UDP port over which the netflow data is exported.

Click Save to configure the exporter. Click Cancel to discard. You can also choose an existing exporter and select Actions > Edit or Actions > Delete to perform relevant actions.

In the Netflow Record area, click Actions > Add to add one or more Netflow records. The fields on this screen are:

Field Description

Record Name

Specifies the name of the record.

Record Template

Specifies the template for the record. Enter one of the record templates names.

The following two record templates are available for use. You can create custom netflow record templates. Custom record templates saved in the template library are available for use here.

  • netflow_ipv4_record - to use the IPv4 record template.

  • netflow_l2_record - to use the Layer 2 record template.

    • Is Layer2 Record - Check this check box if the record is for Layer2 netflow.

Click Save to configure the report. Click Cancel to discard. You can also choose an existing record and select Actions > Edit or Actions > Delete to perform relevant actions.

In the Netflow Monitor area, click Actions > Add to add one or more Netflow monitors. The fields on this screen are:

Field Description

Monitor Name

Specifies the name of the monitor.

Record Name

Specifies the name of the record for the monitor.

Exporter1 Name

Specifies the name of the exporter for the netflow monitor.

Exporter2 Name (optional)

Specifies the name of the secondary exporter for the netflow monitor.

The record name and exporters referred to in each netflow monitor must be defined in Netflow Record and Netflow Exporter.

In the Netflow Sampler area, click Actions > Add to add one or more Netflow samplers. These are optional fields and are applicable only when there are N7K aggregation switches in the fabric. The fields on this screen are:

Field Description

Sampler Name

Specifies the name of the sampler.

Number of Samples

Specifies the number of samples.

Number of Packets in Each Sampling

Specifies the number of packets in each sampling.

Click Save to configure the monitor. Click Cancel to discard. You can also choose an existing monitor and select Actions > Edit or Actions > Delete to perform relevant actions.

What’s next: Complete the configurations in another tab if necessary, or click Save when you have completed the necessary configurations for this fabric.

Telemetry

The telemetry feature in Nexus Dashboard allows you to collect, manage, and monitor real-time telemetry data from your Nexus Dashboard. This data provides valuable insights into the performance and health of your network infrastructure, enabling you to troubleshoot proactively and optimize operations. When you enable telemetry, you gain enhanced visibility into network operations and efficiently manage your fabrics.

Follow these steps to enable telemetry for a specific fabric.

  1. Navigate to the Fabrics page.

    Go to Manage > Fabrics.

  2. Choose the fabric for which you want to enable telemetry.

  3. From the Actions drop-down list, choose Edit fabric settings.

    The Edit fabric-name settings page displays.

    note.svg

    You can also access the Edit fabric-name settings page for a fabric from the Fabric Overview page. In the Fabric Overview page, click the Actions drop-down list and choose Edit fabric settings.

  4. In the Edit fabric-name settings page, click the General tab.

  5. Under the Enabled features section, check the Telemetry check box.

  6. Click Save.

    Navigate back to the Edit fabric-name settings page. The Telemetry tab displays.

    note.svg

    NOTE: The Telemetry tab appears only when you enable the Telemetry option under the General tab in the Edit fabric-name settings page.

The Telemetry tab includes these options.

  • Configuration — allows you to manage telemetry settings and parameters.

  • NAS — provides Network Analytics Service (NAS) features for advanced insights.

Edit configuration settings

The Configuration tab includes these settings.

  • General — allows you to enable analysis.

    You can enable these settings.

    • Enable assurance analysis — enables you to collect of telemetry data from devices to ensure network reliability and performance.

    • Enable Microburst sensitivity - allows you to monitor traffic to detect unexpected data bursts within a very small time window (microseconds). Choose the sensitivity type from the Microburst Sensitivity Level drop-down list. The options are High sensitivity, Medium sensitivity, and Low sensitivity.

      note.svg

      The Enable Microburst sensitivity option is available only for ACI fabrics.

  • Flow collection modes — allows you to choose the mode for telemetry data collection. Modes include NetFlow, sFlow, and Flow Telemetry.

    For more information see: Flow collection and Configure flows.

  • Flow collection rules — allows you to define rules for monitoring specific subnets or endpoints. These rules are pushed to the relevant devices, enabling detailed telemetry data collection.

    For more information, see Flow collection.

Edit NAS settings

Nexus Dashboard allows you to export captured flow records to a remote NAS device using the Network File System (NFS) protocol. Nexus Dashboard defines the directory structure on NAS where the flow records are exported.

You can choose between the two export modes.

  • Full — exports the complete data for each flow record.

  • Base — exports only the essential 5-tuple data for each flow record.

Nexus Dashboard needs both read and write permissions on the NAS to perform the export successfully. If Nexus Dashboard cannot write to the NAS, it will generate an alert to notify you of the issue.

Disable Telemetry

You can uncheck the Telemetry check box on your fabric’s Edit Fabric Settings > General > page to disable the telemetry feature for your fabric. Disabling telemetry puts the telemetry feature in a transition phase and eventually the telemetry feature is disabled.

In certain situations, the disable telemetry workflow can fail, and you may see the Force disable telemetry option on your fabric’s Edit Fabric Settings page.

If you disable the telemetry option using the instructions provided in [Perform force disable telemetry] on your fabric, Nexus Dashboard acknowledges the user intent to disable telemetry feature for your fabric, ignoring any failures.

The Nexus Dashboard Force disable telemetry allows you to perform a force disable action for the telemetry configuration on your fabric. This action is recommended when the telemetry disable workflow has failed and you need to disable the telemetry feature on your fabric.

note.svg

Using the Force disable telemetry feature may leave switches in your fabric with stale telemetry configurations. You must manually clean up these stale configurations on the switches before re-enabling telemetry on your fabric.

Perform force disable telemetry on your fabric

Follow these steps to perform a force disable telemetry on your fabric.

  1. (Optional) Before triggering a force disable of telemetry configuration, resolve any telemetry configuration anomalies flagged on the fabric.

  2. On the Edit Fabric Settings page of your fabric, a banner appears to alert you that telemetry cannot be disabled gracefully, and a Force Disable option is provided with the alert message.

  3. Disable telemetry from the Nexus Dashboard UI using one of these options.

    1. Click the Force disable option in the banner that appears at the top of your fabric’s Edit Fabric Settings page to disable telemetry for your fabric gracefully.

    2. Navigate to your fabric’s Overview page and click the Actions drop-down list to choose Telemetry > Force disable telemetry option.

      Once the force disable action is executed, the Telemetry configuration appears as disabled in Edit Fabric Settings > General > Enabled features > Telemetry area, that is, the Telemetry check box is unchecked.

  4. Clean up any stale telemetry configurations from the fabric before re-enabling telemetry on Nexus Dashboard.

NAS

You can export flow records captured by Nexus Dashboard on a remote Network Attached Storage (NAS) with NFS.

Nexus Dashboard defines the directory structure on NAS where the flow records are exported.

You can export the flow records in Base or Full mode. In Base mode, only 5-tuple data for the flow record is exported. In Full mode the entire data for the flow record is exported.

Nexus Dashboard requires read and write permission to NAS in order to export the flow record. A system issue is raised if Nexus Dashboard fails to write to NAS.

Guidelines and limitations for network attached storage

  • In order for Nexus Dashboard to export the flow records to an external storage, the Network Attached Storage added to Nexus Dashboard must be exclusive for Nexus Dashboard.

  • Network Attached Storage with Network File System (NFS) version 3 must be added to Nexus Dashboard.

  • Flow Telemetry and Netflow records can be exported.

  • Export of FTE is not supported.

  • Average Network Attached Storage requirements for 2 years of data storage at 20k flows per sec:

    • Base Mode: 500 TB data

    • Full Mode: 2.8 PB data

  • If there is not enough disk space, new records will not be exported and an anomaly is generated.

Add network attached storage to export flow records

The workflow to add Network Attached Storage (NAS) to export flow records includes the following steps:

  1. Add NAS to Nexus Dashboard.

  2. Add the onboarded NAS to Nexus Dashboard to enable export of flow records.

Add NAS to Nexus Dashboard

Follow these steps to add NAS to Nexus Dashboard.

  1. Navigate to Admin > System Settings > General.

  2. In the Remote storage area, click Edit.

  3. Click Add Remote Storage Locations.

  4. Complete the following fields to add NAS to Nexus Dashboard.

    1. Enter the name of the Network Attached Storage and a description, if desired.

    2. In the Remote storage location type field, click NAS Storage.

    3. In the Type field, choose Read Write.

      Nexus Dashboard requires read and write permission to export the flow record to NAS. A system issue is raised if Nexus Dashboard fails to write to NAS.

    4. In the Hostname field, enter the IP address of the Network Attached Storage.

    5. In the Port field, enter the port number of the Network Attached Storage.

    6. In the Export path field, enter the export path.

      Using the export path, Nexus Dashboard creates the directory structure in NAS for exporting the flow records.

    7. In the Alert threshold field, enter the alert threshold time.

      Alert threshold is used to send an alert when the NAS is used beyond a certain limit.

    8. In the Limit (Mi/Gi) field, enter the storage limit in Mi/Gi.

    9. Click Save.

Add the onboarded NAS to Nexus Dashboard

Follow these steps to add the onboarded NAS to Nexus Dashboard.

  1. Navigate to the Fabrics page:

    Manage > Fabrics

  2. Choose the fabric with the telemetry feature enabled.

  3. Choose Actions > Edit Fabric Settings.

  4. Click Telemetry.

  5. Click the NAS tab in the Telemetry window.

  6. Make the necessary configurations in the General settings area.

    1. Enter the name in the Name field.

    2. In the NAS server field, choose the NAS server added to Nexus Dashboard from the drop-down list.

  7. In the Collection settings area, choose the flow from the Flows drop-down list.

    • In Base mode, only 5-tuple data for the flow record is exported.

    • In Full mode, the entire data for the flow record is exported.

  8. Click Save.

The traffic from the flows displayed in the Flows page is exported as a JSON file to the external NAS in the following directory hierarchy.

nas-directory.jpg

Navigate to Analyze > Flows to view the flows that will be exported.

Each flow record is written as a line delimited JSON.

JSON output file format for a flow record in base mode

{"fabricName":"myapic","terminalTs":1688537547433,"originTs":1688537530376,"srcIp":"2000:201:1:1::1","dstIp":"2000:201:1:1::3","srcPort":1231,"dstPort":1232,"ingressVrf":"vrf1","egressVrf":"vrf1","ingressTenant":"FSV1","egressTenant":"FSV1","protocol":"UDP"}

{"fabricName":"myapic","terminalTs":1688537547378,"originTs":1688537530377,"srcIp":"201.1.1.127","dstIp":"201.1.1.1","srcPort":0,"dstPort":0,"ingressVrf":"vrf1","egressVrf":"","ingressTenant":"FSV2","egressTenant":"","protocol":"ANY-HOST"}

JSON output file format for a flow record in full mode

{"fabricName":"myapic","terminalTs":1688538023562,"originTs":1688538010527,"srcIp":"201.1.1.121","dstIp":"201.1.1.127","srcPort":0,"dstPort":0,"ingressVrf":"vrf1","egressVrf":"vrf1","ingressTenant":"FSV2","egressTenant":"FSV2","protocol":"ANY-HOST","srcEpg":"ext-epg","dstEpg":"ext-epg1","latencyMax":0,"ingressVif":"eth1/15","ingressVni":0,"latency":0,"ingressNodes":"Leaf1-2","ingressVlan":0,"ingressByteCount":104681600,"ingressPktCount":817825,"ingressBurst":0,"ingressBurstMax":34768,"egressNodes":"Leaf1-2","egressVif":"po4", "egressVni":0,"egressVlan":0,"egressByteCount":104681600,"egressPktCount":817825,"egressBurst":0,"egressBurstMax":34768,"dropPktCount":0,"dropByteCount":0,"dropCode":"","dropScore":0,"moveScore":0,"latencyScore":0,"burstScore":0,"anomalyScore":0,"hashCollision":false,"dropNodes":"[]","nodeNames":"[\"Leaf1-2\"]","nodeIngressVifs":"[\"Leaf1-2,eth1/15\"]","nodeEgressVifs":"[\"Leaf1-2,po4\"]“ ,"srcMoveCount":0,"dstMoveCount":0,"moveCount":0,"prexmit":0,"rtoOutside":false,"events":"[[\\\"1688538010527,Leaf1-2,0,3,1,no,no,eth1/15,,po4,po4,,,,,0,64,0,,,,,,,,\\\"]]"}

Flow collection

Understanding flow telemetry

Flow telemetry allows users to see the path taken by different flows in detail. It also allows you to identify the EPG and VRF instance of the source and destination. You can see the switches in the flow with the help of flow table exports from the nodes. The flow path is generated by stitching together all the exports in order of the flow.

You can configure the Flow Telemetry rule for the following interface types:

  • VRF instances

  • Physical interfaces

  • Port channel interfaces

  • Routed sub-interfaces (Cisco ACI fabric)

  • SVIs (Cisco ACI fabric)

note.svg

In a Cisco ACI fabric, if you want to configure routed sub-interfaces from the UI, select L3 Out.

In an NX-OS fabric, physical or port channel flow rules are supported only on routed interfaces.

Flow telemetry monitors the flow for each fabric separately, as there is no stitching across the fabrics in a fabric group. Therefore, flow telemetry is for individual flows. For example, if there are two fabrics (fabric A and fabric B) within a fabric group, and traffic is flowing between the two fabrics, they will be displayed as two separate flows. One flow will originate from Fabric A and display where the flow exits. And the other flow from Fabric B will display where it enters and where it exits.

Flow telemetry guidelines and limitations

  • All flows are monitored as a consolidated view in a unified pipeline for Cisco ACI and NX-OS fabrics, and the flows are aggregated under the same umbrella.

  • Even if a particular node (for example, a third-party switch) is not supported for Flow Telemetry, Nexus Dashboard will use LLDP information from the previous and next nodes in the path to identify the switch name and the ingress and egress interfaces.

  • Nexus Dashboard supports Kafka export for Flow anomalies. However, Kafka export is not currently supported for Flow Event anomalies.

Flow telemetry guidelines and limitations for NX-OS fabrics

  • Ensure that you have configured NTP and enabled PTP in Nexus Dashboard. See Cisco Nexus Dashboard Deployment Guide and Precision Time Protocol (PTP) for Cisco Nexus Dashboard Insights for more information. You are responsible for configuring the switches with external NTP servers.

  • In the Edit Flow page, you can enable all three telemetry types. sFlow is most restrictive, Netflow has some more capability, and Flow Telemetry has the most capability. We recommend that you enable Flow Telemetry if it is available for your configuration. If Flow Telemetry is not available, then use Netflow. If Netflow is not available, use sFlow.

  • If there are multiple Nexus Dashboard clusters onboarded to Nexus Dashboard, partial paths will be generated for each fabric.

  • If you manually configure the fabric to use with Nexus Dashboard and Flow Telemetry support, the Flows Exporter port changes from 30000 to 5640. To prevent a breakage of the Flows Exporter, adjust the automation.

  • Nexus Dashboard supports Kafka export for Flow anomalies. However, Kafka export is not currently supported for Flow Event anomalies.

  • Flow telemetry is supported in -FX3 platform switches for the following NX-OS versions:

    • 9.3(7) and later

    • 10.1(2) and later

    • Flow telemetry is not supported in -FX3 platform switches for NX-OS version 10.1(1).

  • Interface based Flow Telemetry is only supported on modular chassis with -FX land -GX line cards on physical ports and port-channels rules.

  • If interface-based Flow Telemetry is pushed from Nexus Dashboard for Classic LAN and External Connectivity Network fabrics, perform the following steps:

    • Choose the fabric.

    • Choose Policies > Action > Add policy > Select all > Choose template > host_port_resync and click Save.

    • In the Fabric Overview page, choose Actions > Recalculate and deploy.

  • For VXLAN fabrics, interface-based Flow Telemetry is not supported on switch links between spine switch and leaf switch.

  • If you want to use the default VRF instance for flow telemetry, you must create the VRF instance with a name of "default" in lowercase. Do not enter the name with any capital letters.

  • Flow telemetry is not supported in classic LAN topologies with 2-level VPC access layers.

  • If you want to enable Flow Telemetry, ensure that there are no pre-existing Netflow configurations on the switches. If there are any pre-existing configurations, the switch configuration may fail.

    To enable Flow Telemetry without configuration issues, follow these steps:

    • Ensure that there are no pre-existing Netflow configurations on the switches. If such configurations exist, enabling Flow Telemetry might result in a system anomaly with an error message stating invalid command match IP source address.

    • If you encounter the error, disable Flow Telemetry.

    • Remove any existing Netflow configurations from the switches.

    • Re-enable Flow Telemetry.

    • For some flows, latency information is not available, which could happen due to latency issues. In these cases, latency information will be reported as 0.

Flow telemetry rules guidelines and limitations for NX-OS fabrics

  • If you configure an interface rule (physical or port channel) on a subnet, it can monitor only incoming traffic. It cannot monitor outgoing traffic on the configured interface rule.

  • If a configured port channel that contains two physical ports, only the port channel rule is applicable. Even if you configure physical interface rules on the port, only port channel rule takes precedence.

  • For NX-OS release 10.3(2) and earlier, if a flow rule are configured on an interface, then global flow rules are not matched.

  • For NX-OS release 10.3(3) and later, a flow rule configured on an interface is matched first and then the global flow rules are matched.

Configure flows

Configure flow collection modes

Follow these steps to configure flow collection modes.

  1. Navigate to Admin > System Settings > Flow collection.

  2. In the Flow collection mode area, choose Flow telemetry.

note.svg

Enabling Flow Telemetry automatically activates Flow Telemetry Events. Whenever a compatible event takes place, an anomaly will be generated, and the What’s the impact? section in the Anomaly page will display the associated flows. You can manually configure a Flow Telemetry rule to acquire comprehensive end-to-end information about the troublesome flow.

Configure flow collection rules in an NX-OS fabric

Follow these steps to configure flow collection rules in an NX-OS fabric.

  1. Navigate to the Telemetry window for your fabric.

    1. Navigate to the main Fabrics page:

      Manage > Fabrics

    2. In the table showing all of the Nexus Dashboard fabrics that you have already created, locate the LAN or IPFM fabric where you want to configure telemetry settings.

    3. Single-click on that fabric.

      The Overview page for that fabric appears.

    4. Click Actions > Edit Fabric Settings.

      The Edit fabric_name Settings window appears.

    5. Verify that the Telemetry option is enabled in the Enabled features area.

      The Telemetry tab doesn’t become available unless the Telemetry option is enabled in the Enabled features area.

    6. Click the Telemetry tab to access the telemetry settings for this fabric.

  2. Click the Flow collection tab in the Telemetry window.

  3. In the Mode area, click Flow telemetry.

  4. In the Flow collections rules area, determine what sort of flow collection rule that you want to add.

VRF

To add a VRF rule:

  1. Click the VRF tab.

    A table with already-configured VRF flow collection rules is displayed.

    For any VRF flow collection rule in this table, click the ellipsis (…​), then click Edit rule to edit that rule or Delete rule to delete it.

  2. Add a new rule by clicking Create flow collection rule.

    1. In the General area, complete the following:

      1. Enter the name of the rule in the Rule Name field.

      2. The VRF field is disabled. The flow rule applies to all the VRF instances.

      3. In the Flow Properties area, select the protocol for which you intend to monitor the flow traffic.

      4. Enter the source and destination IP addresses. Enter the source and destination port.

      5. Click Save.

Physical interface

To add a physical interface rule:

  1. Click the Physical interface tab.

    A table with already-configured physical interface flow collection rules is displayed.

    For any physical interface flow collection rule in this table, click the ellipsis (…​), then click Edit rule to edit that rule or Delete rule to delete it.

  2. Add a new rule by clicking Create flow collection rule.

    1. In the General area, complete the following:

      1. Enter the name of the rule in the Rule Name field.

      2. Check the Enabled check box to enable the status. If you enable the status, the rule will take effect. Otherwise, the rule will be removed from the switches.

      3. In the Flow Properties area, select the protocol for which you intend to monitor the flow traffic.

      4. Enter the source and destination IP addresses. Enter the source and destination port.

      5. In the Interface List area, click Select a Node. Use the search box to select a node.

      6. From the drop-down list, select an interface. You can add more than one row (node+interface combination) by clicking Add Interfaces. However, within the rule, a node can appear only once. Configuration is rejected if more than one node is added.

      7. Click Save.

Port channel

To add a port channel rule:

  1. Click the Port channel tab.

    A table with already-configured port channel flow collection rules is displayed.

    For any port channel flow collection rule in this table, click the ellipsis (…​), then click Edit rule to edit that rule or Delete rule to delete it.

  2. Add a new rule by clicking Create flow collection rule.

    1. In the General area, enter the name of the rule in the Rule Name field.

      1. Select the Enabled check box to enable the status. If you enable the status, the rule will take effect. Otherwise, the rule will be removed from the switches.

      2. In the Flow Properties area, select the protocol for which you intend to monitor the flow traffic.

      3. Enter the source and destination IP addresses. Enter the source and destination port.

      4. From the drop-down list, select an interface. You can add more than one row (node+interface combination) by clicking Add Interfaces. However, within the rule, a node can appear only once. Configuration is rejected if more than one node is added.

      5. Click Save.

  3. Click Done.

Monitor the subnet for flow telemetry

In the following example, the configured rule for a flow monitors the specific subnet provided. The rule is pushed to the fabric which pushes it to the switches. So, when the switch sees traffic coming from a source IP or the destination IP, and if it matches the subnet, the information is captured in the TCAM and exported to the Nexus Dashboard service. If there are 4 nodes (A, B, C, D), and the traffic moves from A > B > C > D, the rules are enabled on all 4 nodes and the information is captured by all the 4 nodes. Nexus Dashboard stitches the flows together. Data such as the number of drops and the number of packets, anomalies in the flow, and the flow path are aggregated for the 4 nodes.

Follow these steps to monitor the subnet for flow telemetry.

  1. Navigate to Manage > Fabric.

  2. Choose a fabric.

  3. Verify that your Fabrics and the Snapshot values are appropriate. The default snapshot value is 15 minutes. Your choice will monitor all the flows in the chosen fabric or snapshot fabric.

  4. Navigate to Connectivity > Flows to view a summary of all the flows that are being captured based on the snapshot that you chose.

The related anomaly score, record time, the nodes sending the flow telemetry, flow type, ingress and egress nodes, and additional details are displayed in a table format. If you click a specific flow in the table, specific details are displayed in the sidebar for the particular flow telemetry. In the sidebar, if you click the Details icon, the details are displayed in a larger page. In this page, in addition to other details, the Path Summary is also displayed with specifics related to source and destination. If there are flows in the reverse direction, that will also be visible in this location.

For a bi-directional flow, there is an option to choose to reverse the flow and see the path summary displayed. If there are any packet drops that generate a flow event, they can be viewed in the Anomaly dashboard.

Understanding Netflow

Netflow is an industry standard where Cisco routers monitor and collect network traffic on an interface. Netflow version 9 is supported.

Netflow enables the network administrator to determine information such as source, destination, class of service, and causes of congestion. Netflow is configured on the interface to monitor every packet on the interface and provide telemetry data. You cannot filter on Netflow.

Netflow in Nexus series switches is based on intercepting the packet processing pipeline to capture summary information of network traffic.

The components of a flow monitoring setup are as follows:

  • Exporter: Aggregates packets into flows and exports flow records towards one or more collectors

  • Collector: Reception, storage, and pre-processing of flow data received from a flow exporter

  • Analysis: Used for traffic profiling or network intrusion

  • The following interfaces are supported for Netflow:

Supported interfaces for Netflow
Interfaces 5 Tuple Nodes Ingress Egress Path Comments

Routed Interface/Port Channel

Yes

Yes

Yes

No

Yes

Ingress node is shown in path

Sub Interface/Logical (Switch Virtual Interface)

Yes

Yes

No

No

No

No
note.svg

In an NX-OS fabric, port channel support is available if you monitor only the host-facing interfaces.

Understanding Netflow types

You can use these Netflow types.

Full Netflow

With Full Netflow, all packets on the configured interfaces are captured into flow records in a flow table. Flows are sent to the supervisor module. Records are aggregated over configurable intervals and exported to the collector. Except in the case of aliasing (multiple flows hashing to the same entry in the flow table), all flows can be monitored regardless of their packet rate.

Nexus 9000 Series switches with the Fabric Controller type as well as switches in a Cisco ACI fabric support Full Netflow.

Sampled Netflow

With Sampled Netflow, packets on configured interfaces are time sampled. Flows are sent to the supervisor or a network processor for aggregation. Aggregated flow records are exported at configured intervals. The probability of a record for a flow being captured depends on the sampling frequency and packet rate of the flow relative to other flows on the same interface.

Nexus 7000 and Nexus 7700 Series switches with F/M line cards and the Fabric Controller type, support Sampled Netflow.

Netflow guidelines and limitations

  • In Cisco Nexus 9000 series switches, Netflow supports a small subset of the published export fields in the RFC.

  • Netflow is captured only on the ingress port of a flow as only the ingress switch exports the flow. Netflow cannot be captured on fabric ports.

  • You must configure persistent IP addresses under the cluster configuration, including 7 IP addresses in the same subnet as the data network.

Netflow guidelines and limitations for Cisco ACI fabrics

  • We recommend that you enable Flow Telemetry. If that is not available for your configuration, use Netflow. However, you can determine which mode of flow to use based upon your fabric configuration.

  • Enabling both Flow Telemetry and Netflow is not supported.

  • After you enable Netflow, you must obtain the Netflow collector IP address and configure Cisco APIC with the collector IP address. See Cisco APIC and NetFlow.

    To obtain the Netflow collector IP address, navigate to Admin > System Settings > Flow collection. In the Flow Collection per Fabric table, click View in the Collector List column.

  • The Netflow and sFlow flow collection modes do not support any anomaly.

Netflow guidelines and limitations for NX-OS fabrics

  • In the Edit Flow page, you can enable all three modes. Choose the best possible mode for a product. sFlow is the most restrictive, Netflow has more capabilities, and Flow Telemetry has the most capabilities. We recommend that you enable Flow Telemetry if it is available for your configuration. If Flow Telemetry is not available, then use Netflow. If Netflow is not available, use sFlow.

  • In Nexus 7000 and Nexus 9000 Series switches, only the ingress host-facing interface configured for Netflow are supported (either in VXLAN or Classic LAN).

  • The Netflow supported fabrics are Classic and VXLAN. VXLAN is not supported on fabric ports.

  • Netflow configurations will not be pushed. However, if a fabric is managed, the software sensors will be pushed.

  • If you manually configure the fabric to use with Nexus Dashboard and Netflow support, the Flows Exporter port changes from 30000 to 5640. To prevent a breakage of the Flows Exporter, adjust the automation.

  • To configure Netflow on fabric switches, see the Configuring Netflow section in the Cisco Nexus 9000 Series NX-OS System Management Configuration Guide.

Configure Netflow

Follow these steps to configure Netflow.

  1. Navigate to the Telemetry page for your LAN or IPFM fabric.

  2. Click the Flow collection tab on the Telemetry page.

  3. In the Mode area, make the following choices:

    • Choose Netflow.

    • Choose Flow Telemetry.

  4. Click Save.

Understanding sFlow

sFlow is an industry standard technology traffic in data networks containing switches and routers. Nexus Dashboard supports sFlow version 5 on Cisco Nexus 3000 series switches.

sFlow provides the visibility to enable performance optimization, an accounting and billing for usage, and defense against security threats.

The following interfaces are supported for sFlow:

Supported interfaces for sFlow
Interfaces 5 Tuple Nodes Ingress Egress Path Comments

Routed Interface

Yes

Yes

Yes

Yes

Yes

Ingress node is shown in path

Guidelines and limitations for sFlow

  • Nexus Dashboard supports sFlow with Cisco Nexus 3000 series switches.

  • It is recommended to enable Flow Telemetry if it is available for your configuration. If it is not available for your configuration, use Netflow. If Netflow, is not available for your configuration, then use sFlow.

  • For sFlow, Nexus Dashboard requires the configuration of persistent IPs under cluster configuration, and 6 IPs in the same subnet as the data network are required.

  • sFlow configurations will not be pushed. However, if a fabric is managed, the software sensors will be pushed.

  • If you manually configure the fabric to use with Nexus Dashboard and sFlow support, the Flows Exporter port changes from 30000 to 5640. To prevent a breakage of the Flows Exporter, adjust the automation.

  • Nexus Dashboard does not support sFlow in the following Cisco Nexus 3000 Series switches:

    • Cisco Nexus 3600-R Platform Switch (N3K-C3636C-R)

    • Cisco Nexus 3600-R Platform Switch (N3K-C36180YC-R)

    • Cisco Nexus 3100 Platform Switch (N3K-C3132C-Z)

  • Nexus Dashboard does not support sFlow in the following Cisco Nexus 9000 Series fabric modules:

    • Cisco Nexus 9508-R fabric module (N9K-C9508-FM-R)

    • Cisco Nexus 9504-R fabric module (N9K-C9504-FM-R)

  • To configure sFlow on fabric switches, see the Configuring sFlow section in the Cisco Nexus 9000 Series NX-OS System Management Configuration Guide.

Configure sFlow telemetry

Prerequisites

Follow these steps to configure sFlow telemetry.

  1. Navigate to the Telemetry page for your LAN or IPFM fabric.

  2. Click the Flow collection tab on the Telemetry page.

  3. In the Mode area, make the following choices:

    • Choose sFlow.

    • Choose Flow Telemetry.

  4. Click Save.

External streaming

The External streaming tab in Nexus Dashboard allows you export data that Nexus Dashboard collects over Kafka, email, and syslog. Nexus Dashboard generates data such as advisories, anomalies, audit logs, faults, statistical data, and risk and conformance reports. When you configure a Kafka broker, Nexus Dashboard writes all data to a topic. By default, the Nexus Dashboard collects export data every 30 seconds or at a less frequent interval.

For ACI fabrics, you can also collect data for specific resources (CPU, memory, and interface utilization) every 10 seconds from the leaf and spine switches using a separate data pipeline. To export this data, select the Usage option under Collection Type in the Message bus export settings. Additionally, CPU and memory data is collected for the controllers.

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Nexus Dashboard does not store the collected data in Elasticsearch; instead, it exports the data directly to your repository or data lake using a Kafka broker for consumption. By using the Kafka export functionality, you can then export this data to your Kafka broker and push it into your data lake for further use.

You can configure an email scheduler to define the type of data and the frequency at which you want to receive information via email. You can also export anomaly records to an external syslog server. To do this, select the Syslog option under the External Streaming tab.

Configure external streaming settings

Follow these steps to configure external streaming settings.

  1. Navigate to the Fabrics page.

    Go to Manage > Fabrics.

  2. Choose the fabric for which you configure streaming settings.

  3. From the Actions drop-down list, choose Edit fabric settings.

    The Edit fabric-name settings page displays.

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    You can also access the Edit fabric-name settings page for a fabric from the Fabric Overview page. In the Fabric Overview page, click the Actions drop-down list and choose Edit fabric settings.

  4. In the Edit fabric-name settings page, click the External streaming tab.

    You can view these options.

    • Email

    • Message bus

    • Syslog

Guidelines and limitations

  • Intersight connectivity is required to receive the reports by email.

  • You can configure up to five emails per day for periodic job configurations.

  • A maximum of six exporters is supported for export across all types of exporters including email, message bus, and syslog. You must provide unique names for each export.

  • The scale for Kafka exports is increased to support up to 20 exporters per cluster. However, statistics selection is limited to any six exporters.

  • Before configuring your Kafka export, you must add the external Kafka IP address as a known route in your Nexus Dashboard cluster configuration and verify that Nexus Dashboard can reach the external Kafka IP address over the network.

  • The anomalies in Kafka and email messages include categories such as Resources, Environmental, Statistics, Endpoints, Flows, and Bugs.

  • Export data is not supported for snapshot fabrics.

  • You must provide unique names for each exporter, and they may not be repeated between Kafka export for Alerts and Events and Kafka export for Usage.

  • Nexus Dashboard supports Kafka export for flow anomalies. However, Kafka export is not currently supported for flow Event anomalies.

Guidelines and limitations in NX-OS fabrics

  • Remove all configurations in the Message Bus Configuration and Email page before you disable Software Telemetry on any fabric and remove the fabric from Nexus Dashboard.

Email

The email scheduler feature in Nexus Dashboard automates the distribution of summarized data collected from Nexus Dashboard. It allows customization of selection of email recipients, choice of email format, scheduling frequency settings, and configuring the types of alerts and reports.

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To configure email at the system settings level, see [Add email configuration].

Follow these steps to configure an email scheduler.

  1. Navigate to the Fabrics page.

    Go to Manage > Fabrics.

  2. Choose the fabric for which you configure streaming settings.

  3. From the Actions drop-down list, choose Edit fabric settings.

    The Edit fabric-name settings page displays.

  4. In the Edit fabric-name settings page, click the External streaming tab.

  5. Click the Email tab.

  6. Review the information provided in the Email tab for already-configured email configurations.

    The following details display under Email tab.

Field Description

Name

The name of the email configuration.

Email

The email addresses used in the email configuration.

Start time

The start date used in the email configuration.

Frequency

The frequency in days or weeks set in the email configuration.

Anomalies

The severity level for anomalies and advisories set in the email configuration.

Advisories

Risk and conformance reports

The status of the overall inventory for a fabric, including software release, hardware platform, and a combination of software and hardware conformance.

To add a new email configuration, click Add email in the Email page.

  1. Follow these steps to configure General Settings.

    1. In the Name field, enter the name of the email scheduler.

    2. In the Email field, enter one or more email addresses separated by commas.

    3. In the Format field, choose Text or HTML email format.

    4. In the Start date field, choose the start date when the scheduler should begin sending emails.

    5. In the Collection frequency in days field, specify how often the summary is sent, you can choose days or weeks.

      nd-email-streaming-general.jpg

  2. Follow these steps to configure Collection Settings.

    1. In the Mode field, choose one of the following modes.

      • Basic — displays the severity levels for anomalies and advisories.

      • Advanced — displays the categories and severity levels for anomalies and advisories.

    2. Check the Only include active alerts in email check box, to include only active anomaly alerts.

    3. Under Anomalies choose the categories and severity levels for the anomalies.

    4. Under Advisories choose the categories and severity levels for the advisories.

    5. Under Risk and Conformance Reports, choose from the following options.

      • Software

      • Hardware

        nd-email-streaming-collection.jpg

  3. Click Save.

    The Email area displays the configured email schedulers.

You will receive an email about the scheduled job on the provided Start Date and at the time provided in the Collection frequency in days field. The subsequent emails follow after Collect Every frequency expires. If the provided time is in the past, Nexus Dashboard will send you an email immediately and trigger the next email after the duration from the provided start time expires.

Message bus

Add Kafka broker configuration

Follow these steps to configure the message bus and add kafka broker.

  1. Configure the message bus at the System Settings level.

    1. Navigate to Admin > System Settings > General.

    2. In the Message bus configuration area, click Edit.

      The Message bus configuration dialog box opens.

    3. Click Add message bus configuration.

      The Add message bus configuration dialog box opens.

    4. In the Name field, enter a name for the configuration.

    5. In the Hostname/IP address and Port fields, enter the IP address of the message bus consumer and the port that is listening on the message bus consumer.

    6. In the Topic name field, enter the name of the Kafka topic to which Nexus Dashboard must send the messages.

    7. In the Mode field, choose the security mode.

      The supported modes are Unsecured, Secured SSL and SASLPLAIN. The default value is Unsecured.

      • For Unsecured, no other configurations are needed.

      • For Secured SSL, fill out the following field:

        Client certification name — The System Certificate name configured at the Certificate Management level. The CA certificate and System Certificate (which includes Client certificate and Client key) are added at the Certificate Management level.

        Refer to Step 2 for step-by-step instructions on managing certificates. Navigate to Admin > Certificate Management to manage the following certificates:

        • CA Certificate — The CA certificate used for signing consumer certificate, which will be stored in the trust-store so that Nexus Dashboard can trust the consumer.

        • Client Certificate — The CA signed certificate for Nexus Dashboard. The certificate is signed by the same CA, and the same CA certificate will be in the truststore of the consumer. This will be stored in Nexus Dashboard’s Kafka keystore that is used for exporting.

        • Client Key — A private key for the Kafka producer, which is Nexus Dashboard in this case. This will be stored in Nexus Dashboard’s Kafka keystore that is used for exporting.

      • For SASLPLAIN, fill out these fields:

        • Username — The username for the SASL/PLAIN authentication.

        • Password — The password for the SASL/PLAIN authentication.

    8. Click Save

  2. Add CA certificates and System certificates at the Certificate Management level.

    1. Navigate to Admin > Certificate Management.

    2. In the Certificate management page, click the CA Certificates tab, then click Add CA certificate.

      The fields in the CA Certificates tab are described in the following table.

      Field Description

      Certificate name

      The name of the CA certificate.

      Certificate details

      The details of the CA certificate.

      Attached to

      The CA signed certificate attached to Nexus Dashboard.

      Expires on

      The Expiry date and time of the CA certificate.

      Last updated time

      The last updated time of the CA certificate.

    3. In the Certificate management page, click the System certificates tab, then click Add system certificate to add Client Certificate and Client key. Note that the Client certificate and Client key should have same names except extensions as .cer/.crt/.pem for Client certificate and .key for Client key.

      note.svg

      You must add a valid CA Certificate before adding the corresponding System Certificate.

      The fields in the System Certificates tab are described in the following table.

      Field Description

      Certificate name

      The name of the Client certificate.

      Certificate details

      The details of the Client certificate.

      Attached to

      The feature to which the system certificate is attached to, in this case, the message bus.

      Expires on

      The Expiry date and time of the CA certificate.

      Last updated time

      The last updated time of the CA certificate.
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    To configure message bus, the System Certificate should be attached to message bus feature.

To attach a System Certificate to the message bus feature:

  1. Choose the System Certificate that you want to use and click the ellipses (…) on that row.

  2. Choose Manage Feature Attachments from the drop-down list.

    The Manage Feature Attachments dialog box opens.

  3. In the Features field, choose messageBus.

  4. Click Save.

For more information on CA certificates, see Managing Certificates in your Nexus Dashboard.

Configure Kafka exports in fabric settings

  1. Navigate to the External streaming page for your fabric.

    1. Navigate to the Fabrics page.

      Go to Manage > Fabrics.

    2. Choose the fabric for which you configure streaming settings.

    3. From the Actions drop-down list, choose Edit fabric settings.

      The Edit fabric-name settings page displays.

    4. In the Edit fabric-name settings page, click the External streaming tab.

    5. Click the Message bus tab.

  2. Review the information provided in the Message bus tab for already-configured message bus configurations, or click Add message bus to add a new message bus configuration.

    Skip to Step 3 if you are adding a message bus.

    The fields in the Message bus tab are described in the following table.

    Field Description

    Message bus stream

    The name of the message bus stream configuration.

    Collection type

    The collection type used by the message bus stream.

    Mode

    The mode used by the message bus stream.

    Anomalies

    The severity level for anomalies and advisories set in the message bus stream configuration.

    Advisories

    Statistics

    The statistics that were configured for the message bus stream.

    Faults

    The severity level for faults set in the message bus stream configuration.

    Audit Logs

    The audit logs that were configured for the message bus stream.

  3. To configure a new message bus stream, in the Message bus page, click Add message bus.

  4. In the Message bus stream field, choose the message bus stream that you want to edit.

  5. In the Collection Type area, choose the appropriate collection type.

    Depending on the Collection Type that you choose, the options displayed in this area will change.

    • Alerts and events: This is the default setting. Continue to Step 7, if you choose Alerts and events.

    • Usage: In the Collection settings area, under Data, the Resources, and Statistics for the collection settings are displayed. By default, the data for CPU, Memory, and Interface Utilization are collected and exported. You cannot choose to export a subset of these resources.

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      Usage is applicable only for ACI Fabrics. This option is disabled for other fabrics.

  6. Click Save. The configured message bus streams are displayed in the Message bus area. This configuration now sends immediate notification when the selected anomalies or advisories occur.

  7. If you choose Alerts and events as the Collection Type, in the Mode area, choose either Basic or Advanced.

    The configurations that are available in each collection settings section might vary, depending on the mode that you set.

  8. Determine which area you want to configure for the message bus stream.

    The following areas appear in the page:

    After you complete the configurations on this page, click Save. Nexus Dashboard displays the configured message bus streams in the Message bus area. This configuration now sends immediate notification when the selected anomalies or advisories occur.

Anomalies

  • If you chose Basic in the Mode area, choose one or more of the following severity levels for anomaly statistics that you want to configure for the message bus stream:

    • Critical

    • Major

    • Warning

    • Minor

    Or click Select all to select all available statistics for the message bus stream.

  • If you chose Advanced in the Mode area:

    • Choose one or more of the following categories for anomaly statistics that you want to configure for the message bus stream:

      • Active Bugs

      • Capacity

      • Compliance

      • Configuration

      • Connectivity

      • Hardware

      • Integrations

      • System

    • Choose one or more of the following severity levels for anomaly statistics that you want to configure for the message bus stream:

      • Critical

      • Major

      • Warning

      • Minor

      Or click Select all to select all available categories and statistics for the message bus stream.

    For more information on anomaly levels, see Detecting Anomalies and Identifying Advisories in Your Nexus Dashboard.

Advisories

  • If you chose Basic in the Mode area, choose one or more of the following severity levels for advisory statistics that you want to configure for the message bus stream:

    • Critical

    • Major

    • Warning

    • Minor

    Or click Select all to select all available statistics for the message bus stream.

  • If you chose Advanced in the Mode area:

    • Choose one or more of the following categories for advisory statistics that you want to configure for the message bus stream:

      • Best Practices

      • Field Notices

      • HW end-of-life

      • SW end-of-life

      • PSIRT

    • Choose one or more of the following severity levels for advisory statistics that you want to configure for the message bus stream:

      • Critical

      • Major

      • Warning

      • Minor

      Or click Select all to select all available categories and statistics for the message bus stream.

    For more information on advisory levels, see Detecting Anomalies and Identifying Advisories in Your Nexus Dashboard.

Statistics

There are no differences in the settings in the Statistics area when you choose Basic or Advanced in the Mode area.

Choose one or more of the following categories for statistics that you want to configure for the message bus stream:

  • Interfaces

  • Protocol

  • Resource Allocation

  • Environmental

  • Endpoints

Faults

There are no differences in the settings in the Faults area when you choose Basic or Advanced in the Mode area.

Choose one or more of the following severity levels for fault statistics that you want to configure for the message bus stream:

  • Critical

  • Major

  • Minor

  • Warning

  • Info

Audit Logs

There are no differences in the settings in the Audit Logs area when you choose Basic or Advanced in the Mode area.

Choose one or more of the following categories for audit logs that you want to configure for the message bus stream:

  • Creation

  • Deletion

  • Modification

Syslog

Nexus Dashboard supports the export of anomalies in syslog format. You can use the syslog configuration feature to develop network monitoring and analytics applications on top of Nexus Dashboard, integrate with the syslog server to get alerts, and build customized dashboards and visualizations.

After you choose the fabric where you want to configure the syslog exporter and set up the syslog export configuration, Nexus Dashboard establishes a connection with the syslog server and sends data to the syslog server.

Nexus Dashboard exports anomaly records to the syslog server. With syslog support, you can export anomalies to your third-party tools even if you do not use Kafka.

Guidelines and limitations for syslog

If the syslog server is not operational at a certain time, messages generated during that downtime will not be received by a server after the server becomes operational.

Add syslog server configuration

Follow these steps to add syslog server configuration.

  1. Navigate to Admin > System Settings > General.

  2. In the Remote streaming servers area, click Edit.

    The Remote streaming servers page displays.

  3. Click Add server.

    The Add server page displays.

  4. Choose the Service as Syslog.

  5. Choose the Protocol.

    You have these options.

    • TCP

    • UDP

  6. In the Name field, provide the name for the syslog server.

  7. In the Hostname/IP address field, provide the hostname or IP address of the syslog server.

  8. In the Port field, specify the port number used by the syslog server.

  9. If you want to enable secure communication, check the TLS check box.

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    Before you enable TLS you must upload the CA certificate for the syslog destination host to Nexus Dashboard. For more information see, Upload a CA certificate.

Configure syslog to enable exporting anomalies data to a syslog server

Follow these steps to configure syslog to enable exporting anomalies data to a syslog server.

  1. Navigate to the Fabrics page.

    Go to Manage > Fabrics.

  2. Choose the fabric for which you configure streaming settings.

  3. From the Actions drop-down list, choose Edit fabric settings.

    The Edit fabric-name settings page displays.

  4. In the Edit fabric-name settings page, click the External streaming tab.

  5. Click the Syslog tab.

    The following details display under Syslog tab.

    nd-configure-syslog.jpg

  6. Make the necessary configurations in the General settings area.

    1. In the Syslog server drop down list, choose a syslog server.

      The Syslog server drop down list displays the syslog servers that you added in the System Settings level. For more information, see Add syslog server configuration.

    2. In the Facility field, from the drop-down list, choose the appropriate facility string.

      A facility code is used to specify the type of system that is logging the message. For this feature, the local0-local7 keywords for locally used facility are supported.

  7. In the Collection settings area, choose the desired severity options.

    The options available are Critical, Major, and Warning.

  8. Click Save.

Upload a CA certificate

Follow these steps to upload a CA certificate for syslog server TLS.

  1. Navigate to Admin > Certificate Management.

  2. In the Certificate management page, click the CA certificates tab, then click Add CA certificate.

    You can upload multiple files at a single instance.

  3. Browse your local directory and choose the certificate-key pair to upload.

    You can upload certificates with the .pem/.cer/.crt/ file extensions.

  4. Click Save to upload the selected files to Nexus Dashboard.

    A successful upload message appears. The uploaded certificates are listed in the table.

Additional settings

The following sections provide information for additional settings that might be necessary when editing the settings for a classic fabric.

About aggregation-access pairing in a Classic LAN fabric

Nexus Dashboard has a one-click vPC feature for automatically detecting and pairing aggregation and access switches for optimal traffic engineering. By default, the auto aggregation-access pairing option is enabled, which means that after you perform a Recalculate and deploy operation, Nexus Dashboard automatically detects the connectivity between the aggregation and the access switches and generates the appropriate configurations based on the detected supported topologies. The configurations include vPC domains that Nexus Dashboard automatically pushes to the paired aggregation and access switches. The links between these aggregation-access pairs are bundled into a common vPC logical construct.

Workflow for configuring aggregation-access pairing

  1. Create a Classic LAN fabric. For more information, see Creating LAN and ACI Fabrics and Fabric Groups.

  2. Discover the switches in the fabric. For more information, see the section "Adding Switches to a Fabric" in Configuring Switches for LAN and IPFM Fabrics.

  3. Add the switches using a bootstrap. For more information, see the section "Adding Switches Using Bootstrap Mechanism" in Configuring Switches for LAN and IPFM Fabrics.

  4. Define the roles for the aggregation and access switches. For more information, see the section "Assigning Switch Roles" in Configuring Switches for LAN and IPFM Fabrics.

  5. Configure the vPC pairing. For more information, see the section "Creating a vPC Setup" in Configuring Switches for LAN and IPFM Fabrics.

  6. Configure aggregation-access pairings. For more information, see Create aggregation-access pairings.

  7. Recalculate and deploy.

Create aggregation-access pairings

  1. Perform the following procedure to configure an aggregation and an access switch, where aggregation switches are connected to access switches through a port channel.

  2. Add an aggregation and an access switch to a Classic LAN fabric and set the role as either Access or Aggregation depending on the type of switch.

    With a Classic LAN fabric, Nexus Dashboard supports a minimum of two aggregation switches and the aggregation switches must be in a vPC pair.

  3. On the fabric Overview page for the Classic LAN fabric, click Inventory, then choose an aggregation switch.

  4. Click Actions > Access Pairing.

    The Access Pairing page displays the aggregation switches on the top and a list of potential pairing access switches below the aggregation switches. The pairing status is displayed in the Details column.

  5. Choose Action > Edit Pairing.

    The aggregation page displays.

  6. Check the Enable <switch-name> Pairing as Access Pairing check box to pair the switches.

  7. Click Save.

  8. On the Fabric Overview page, click Actions > Recalculate and deploy.

  9. After the configuration deployment is completed on the Deploy Configuration page, click Close.

Unpair aggregation-access switches

  1. Uncheck the Enable <switch-name> Pairing as Access Pairing check box to unpair the switches.

    You cannot unpair an aggregation-access pair if overlays are attached.

  2. On the fabric Overview page, click Actions > Recalculate and deploy to complete the unpairing operation.

Specifying a vPC/Port-Channel ID Range and Providing Custom vPC/Port-Channel IDs for Aggregation-Access Pairing

With this feature, you can:

  • Configure a specific vPC/port-channel ID range for aggregation-access pairing by enabling the Use Specific vPC/Port-Channel ID Range field. Nexus Dashboard then displays the vPC/Port-Channel ID Range field with the recommended vPC/port-channel ID range.

  • Edit vPC/port-channel IDs for paired switches.

Configure Fabric Settings for Specifying a vPC/Port-Channel ID Range for Aggregation-Access Pairing

  1. On the Fabric Overview page, create an Enhanced Classic LAN fabric. For more information, see [Creating an Enhanced Classic LAN Fabric].

  2. Click on the vPC tab.

  3. Check the Use Specific vPC/Port-Channel ID Range check box to use a specific vPC/port-channel ID range for aggregation-access pairing.

    The vPC/Port-Channel ID Range field displays the recommended values.

    The recommended values are from 1-499.

    note.svg

    You can increase the existing range or add more ranges if the values are exhausted.

  4. Specify a range for the vPC/Port-Channel ID Range field if you do not want to use the recommended values.

  5. Click Save.

    The new range applies to the new pairing.

Edit the Aggregation or the Access vPC/Port Channel IDs

  1. On the Fabric Overview > Switches page, choose the aggregation switch you want to edit and click Actions > Access Pairing.

    The Access Pairing page appears with a horizontal bar of the paired aggregation switches.

  2. Click Edit Pairing under the Action column.

    The access-aggregation paired switches page displays.

    The Enable <switch-name> Pairing as Access Pairing check box is checked due to auto aggregation-access pairing.

  3. Click the arrow on the right-hand column of the page to view the fields.

  4. Modify the access or the aggregation vPC/port-channel IDs if you want to change the values.

  5. Click Save.

    note.svg

    If you have overlays attached to the paired switches, you cannot change the vPC/port-channel IDs.

  6. Navigate to the Fabric Overview > Switches page and click Actions > Recalculate and deploy.

    The Deploy Configuration page displays with the list of aggregation switches.

    After successful deployment, the Fabric Status column displays as In-Sync.

First Published: 2025-01-31
Last Modified: 2025-01-31

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