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Cluster and storage switches

Migrate to two-node switched cluster

Contributors netapp-yvonneo netapp-jolieg
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If you have an existing two-node switchless cluster environment, you can migrate to a two-node switched cluster environment using Cisco Nexus 9336C-FX2 switches.

The migration process works for all nodes using optical or Twinax ports, but is not supported on this switch if nodes are using onboard 10Gb BASE-T RJ45 ports for the cluster-network ports.

Review requirements

What you'll need

  • For the two-node switchless configuration:

    • The two-node switchless configuration is properly set up and functioning.

    • All cluster ports are in the up state.

    • All cluster logical interfaces (LIFs) are in the up state and on their home ports.

    • See Hardware Universe for all supported ONTAP versions.

  • For the Cisco Nexus 9336C-FX2 switch configuration:

    • Both switches have management network connectivity.

    • There is console access to the cluster switches.

    • Nexus 9336C-FX2 node-to-node switch and switch-to-switch connections use Twinax or fiber cables.

      See Hardware Universe for more information about cabling.

  • Inter-Switch Link (ISL) cables are connected to ports 1/35 and 1/36 on both 9336C-FX2 switches.

  • Initial customization of both the 9336C-FX2 switches are completed, so that:

    • 9336C-FX2 switches are running the latest version of software.

    • Reference Configuration Files (RCFs) are applied to the switches. Any site customization, such as SMTP, SNMP, and SSH, is configured on the new switches.

About the examples

The examples in this procedure use the following cluster switch and node nomenclature:

  • The names of the 9336C-FX2 switches are cs1 and cs2.

  • The names of the cluster SVMs are node1 and node2.

  • The names of the LIFs are node1_clus1 and node1_clus2 on node 1, and node2_clus1 and node2_clus2 on node 2 respectively.

  • The cluster1::*> prompt indicates the name of the cluster.

  • The cluster ports used in this procedure are e0a and e0b.

See Hardware Universe for information about the cluster ports for your platforms.

Migrate the switches

Step 1: Prepare for migration

  1. If AutoSupport is enabled on this cluster, suppress automatic case creation by invoking an AutoSupport message:

    system node autosupport invoke -node * -type all -message MAINT=xh

    where x is the duration of the maintenance window in hours.

    Note The AutoSupport message notifies technical support of this maintenance task so that automatic case creation is suppressed during the maintenance window.

  2. Change the privilege level to advanced, entering y when prompted to continue:

    set -privilege advanced

    The advanced prompt (*>) appears.

Step 2: Configure ports and cabling

  1. Disable all node-facing ports (not ISL ports) on both the new cluster switches cs1 and cs2.

    Do not disable the ISL ports.

    Show example

    The following example shows that node-facing ports 1 through 34 are disabled on switch cs1:

    cs1# config
Enter configuration commands, one per line. End with CNTL/Z.
cs1(config)# interface e1/1/1-4, e1/2/1-4, e1/3/1-4, e1/4/1-4, e1/5/1-4, e1/6/1-4, e1/7-34
cs1(config-if-range)# shutdown

  2. Verify that the ISL and the physical ports on the ISL between the two 9336C-FX2 switches cs1 and cs2 are up on ports 1/35 and 1/36:

    show port-channel summary

    Show example

    The following example shows that the ISL ports are up on switch cs1:

    cs1# show port-channel summary

Flags:  D - Down        P - Up in port-channel (members)
        I - Individual  H - Hot-standby (LACP only)
        s - Suspended   r - Module-removed
        b - BFD Session Wait
        S - Switched    R - Routed
        U - Up (port-channel)
        p - Up in delay-lacp mode (member)
        M - Not in use. Min-links not met
--------------------------------------------------------------------------------
Group Port-       Type     Protocol  Member Ports
      Channel
--------------------------------------------------------------------------------
1     Po1(SU)     Eth      LACP      Eth1/35(P)   Eth1/36(P)

    The following example shows that the ISL ports are up on switch cs2:

    (cs2)# show port-channel summary

Flags:  D - Down        P - Up in port-channel (members)
        I - Individual  H - Hot-standby (LACP only)
        s - Suspended   r - Module-removed
        b - BFD Session Wait
        S - Switched    R - Routed
        U - Up (port-channel)
        p - Up in delay-lacp mode (member)
        M - Not in use. Min-links not met
--------------------------------------------------------------------------------
Group Port-       Type     Protocol  Member Ports
      Channel
--------------------------------------------------------------------------------
1     Po1(SU)     Eth      LACP      Eth1/35(P)   Eth1/36(P)

  3. Display the list of neighboring devices:

    show cdp neighbors

    This command provides information about the devices that are connected to the system.

    Show example

    The following example lists the neighboring devices on switch cs1:

    cs1# show cdp neighbors

Capability Codes: R - Router, T - Trans-Bridge, B - Source-Route-Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater,
                  V - VoIP-Phone, D - Remotely-Managed-Device,
                  s - Supports-STP-Dispute

Device-ID          Local Intrfce  Hldtme Capability  Platform      Port ID
cs2                Eth1/35        175    R S I s     N9K-C9336C    Eth1/35
cs2                Eth1/36        175    R S I s     N9K-C9336C    Eth1/36

Total entries displayed: 2

    The following example lists the neighboring devices on switch cs2:

    cs2# show cdp neighbors

Capability Codes: R - Router, T - Trans-Bridge, B - Source-Route-Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater,
                  V - VoIP-Phone, D - Remotely-Managed-Device,
                  s - Supports-STP-Dispute

Device-ID          Local Intrfce  Hldtme Capability  Platform      Port ID
cs1                Eth1/35        177    R S I s     N9K-C9336C    Eth1/35
cs1                Eth1/36        177    R S I s     N9K-C9336C    Eth1/36

Total entries displayed: 2

  4. Verify that all cluster ports are up:

    network port show -ipspace Cluster

    Each port should display up for Link and healthy for Health Status.

    Show example 
    cluster1::*> network port show -ipspace Cluster

Node: node1

                                                  Speed(Mbps) Health
Port      IPspace      Broadcast Domain Link MTU  Admin/Oper  Status
--------- ------------ ---------------- ---- ---- ----------- --------
e0a       Cluster      Cluster          up   9000  auto/10000 healthy
e0b       Cluster      Cluster          up   9000  auto/10000 healthy

Node: node2

                                                  Speed(Mbps) Health
Port      IPspace      Broadcast Domain Link MTU  Admin/Oper  Status
--------- ------------ ---------------- ---- ---- ----------- --------
e0a       Cluster      Cluster          up   9000  auto/10000 healthy
e0b       Cluster      Cluster          up   9000  auto/10000 healthy

4 entries were displayed.

  5. Verify that all cluster LIFs are up and operational:

    network interface show -vserver Cluster

    Each cluster LIF should display true for Is Home and have a Status Admin/Oper of up/up.

    Show example 
    cluster1::*> network interface show -vserver Cluster

            Logical    Status     Network            Current       Current Is
Vserver     Interface  Admin/Oper Address/Mask       Node          Port    Home
----------- ---------- ---------- ------------------ ------------- ------- -----
Cluster
            node1_clus1  up/up    169.254.209.69/16  node1         e0a     true
            node1_clus2  up/up    169.254.49.125/16  node1         e0b     true
            node2_clus1  up/up    169.254.47.194/16  node2         e0a     true
            node2_clus2  up/up    169.254.19.183/16  node2         e0b     true
4 entries were displayed.

  6. Verify that auto-revert is enabled on all cluster LIFs:

    network interface show -vserver Cluster -fields auto-revert

    Show example 
    cluster1::*> network interface show -vserver Cluster -fields auto-revert

          Logical
Vserver   Interface     Auto-revert
--------- ------------- ------------
Cluster
          node1_clus1   true
          node1_clus2   true
          node2_clus1   true
          node2_clus2   true

4 entries were displayed.

  7. Disconnect the cable from cluster port e0a on node1, and then connect e0a to port 1 on cluster switch cs1, using the appropriate cabling supported by the 9336C-FX2 switches.

    The Hardware Universe - Switches contains more information about cabling.

    Hardware Universe - Switches

  8. Disconnect the cable from cluster port e0a on node2, and then connect e0a to port 2 on cluster switch cs1, using the appropriate cabling supported by the 9336C-FX2 switches.

  9. Enable all node-facing ports on cluster switch cs1.

    Show example

    The following example shows that ports 1/1 through 1/34 are enabled on switch cs1:

    cs1# config
Enter configuration commands, one per line. End with CNTL/Z.
cs1(config)# interface e1/1/1-4, e1/2/1-4, e1/3/1-4, e1/4/1-4, e1/5/1-4, e1/6/1-4, e1/7-34
cs1(config-if-range)# no shutdown

  10. Verify that all cluster LIFs are up, operational, and display as true for Is Home:

    network interface show -vserver Cluster

    Show example

    The following example shows that all of the LIFs are up on node1 and node2 and that Is Home results are true:

    cluster1::*> network interface show -vserver Cluster

         Logical      Status     Network            Current     Current Is
Vserver  Interface    Admin/Oper Address/Mask       Node        Port    Home
-------- ------------ ---------- ------------------ ----------- ------- ----
Cluster
         node1_clus1  up/up      169.254.209.69/16  node1       e0a     true
         node1_clus2  up/up      169.254.49.125/16  node1       e0b     true
         node2_clus1  up/up      169.254.47.194/16  node2       e0a     true
         node2_clus2  up/up      169.254.19.183/16  node2       e0b     true

4 entries were displayed.

  11. Display information about the status of the nodes in the cluster:

    cluster show

    Show example

    The following example displays information about the health and eligibility of the nodes in the cluster:

    cluster1::*> cluster show

Node                 Health  Eligibility   Epsilon
-------------------- ------- ------------  ------------
node1                true    true          false
node2                true    true          false

2 entries were displayed.

  12. Disconnect the cable from cluster port e0b on node1, and then connect e0b to port 1 on cluster switch cs2, using the appropriate cabling supported by the 9336C-FX2 switches.

  13. Disconnect the cable from cluster port e0b on node2, and then connect e0b to port 2 on cluster switch cs2, using the appropriate cabling supported by the 9336C-FX2 switches.

  14. Enable all node-facing ports on cluster switch cs2.

    Show example

    The following example shows that ports 1/1 through 1/34 are enabled on switch cs2:

    cs2# config
Enter configuration commands, one per line. End with CNTL/Z.
cs2(config)# interface e1/1/1-4, e1/2/1-4, e1/3/1-4, e1/4/1-4, e1/5/1-4, e1/6/1-4, e1/7-34
cs2(config-if-range)# no shutdown

  15. Verify that all cluster ports are up:

    network port show -ipspace Cluster

    Show example

    The following example shows that all of the cluster ports are up on node1 and node2:

    cluster1::*> network port show -ipspace Cluster

Node: node1
                                                                       Ignore
                                                  Speed(Mbps) Health   Health
Port      IPspace      Broadcast Domain Link MTU  Admin/Oper  Status   Status
--------- ------------ ---------------- ---- ---- ----------- -------- ------
e0a       Cluster      Cluster          up   9000  auto/10000 healthy  false
e0b       Cluster      Cluster          up   9000  auto/10000 healthy  false

Node: node2
                                                                       Ignore
                                                  Speed(Mbps) Health   Health
Port      IPspace      Broadcast Domain Link MTU  Admin/Oper  Status   Status
--------- ------------ ---------------- ---- ---- ----------- -------- ------
e0a       Cluster      Cluster          up   9000  auto/10000 healthy  false
e0b       Cluster      Cluster          up   9000  auto/10000 healthy  false

4 entries were displayed.

Step 3: Verify the configuration

  1. Verify that all interfaces display true for Is Home:

    network interface show -vserver Cluster

    Note This might take several minutes to complete.
    Show example

    The following example shows that all LIFs are up on node1 and node2 and that Is Home results are true:

    cluster1::*> network interface show -vserver Cluster

          Logical      Status     Network            Current    Current Is
Vserver   Interface    Admin/Oper Address/Mask       Node       Port    Home
--------- ------------ ---------- ------------------ ---------- ------- ----
Cluster
          node1_clus1  up/up      169.254.209.69/16  node1      e0a     true
          node1_clus2  up/up      169.254.49.125/16  node1      e0b     true
          node2_clus1  up/up      169.254.47.194/16  node2      e0a     true
          node2_clus2  up/up      169.254.19.183/16  node2      e0b     true

4 entries were displayed.

  2. Verify that both nodes each have one connection to each switch:

    show cdp neighbors

    Show example

    The following example shows the appropriate results for both switches:

    (cs1)# show cdp neighbors

Capability Codes: R - Router, T - Trans-Bridge, B - Source-Route-Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater,
                  V - VoIP-Phone, D - Remotely-Managed-Device,
                  s - Supports-STP-Dispute

Device-ID          Local Intrfce  Hldtme Capability  Platform      Port ID
node1              Eth1/1         133    H           FAS2980       e0a
node2              Eth1/2         133    H           FAS2980       e0a
cs2                Eth1/35        175    R S I s     N9K-C9336C    Eth1/35
cs2                Eth1/36        175    R S I s     N9K-C9336C    Eth1/36

Total entries displayed: 4

(cs2)# show cdp neighbors

Capability Codes: R - Router, T - Trans-Bridge, B - Source-Route-Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater,
                  V - VoIP-Phone, D - Remotely-Managed-Device,
                  s - Supports-STP-Dispute

Device-ID          Local Intrfce  Hldtme Capability  Platform      Port ID
node1              Eth1/1         133    H           FAS2980       e0b
node2              Eth1/2         133    H           FAS2980       e0b
cs1                Eth1/35        175    R S I s     N9K-C9336C    Eth1/35
cs1                Eth1/36        175    R S I s     N9K-C9336C    Eth1/36

Total entries displayed: 4

  3. Display information about the discovered network devices in your cluster:

    network device-discovery show -protocol cdp

    Show example 
    cluster1::*> network device-discovery show -protocol cdp
Node/       Local  Discovered
Protocol    Port   Device (LLDP: ChassisID)  Interface         Platform
----------- ------ ------------------------- ----------------  ----------------
node2      /cdp
            e0a    cs1                       0/2               N9K-C9336C
            e0b    cs2                       0/2               N9K-C9336C
node1      /cdp
            e0a    cs1                       0/1               N9K-C9336C
            e0b    cs2                       0/1               N9K-C9336C

4 entries were displayed.

  4. Verify that the settings are disabled:

    network options switchless-cluster show

    Note It might take several minutes for the command to complete. Wait for the '3 minute lifetime to expire' announcement.
    Show example

    The false output in the following example shows that the configuration settings are disabled:

    cluster1::*> network options switchless-cluster show
Enable Switchless Cluster: false

  5. Verify the status of the node members in the cluster:

    cluster show

    Show example

    The following example shows information about the health and eligibility of the nodes in the cluster:

    cluster1::*> cluster show

Node                 Health  Eligibility   Epsilon
-------------------- ------- ------------  --------
node1                true    true          false
node2                true    true          false

  6. Verify the connectivity of the remote cluster interfaces:

ONTAP 9.9.1 and later

You can use the network interface check cluster-connectivity command to start an accessibility check for cluster connectivity and then display the details:

network interface check cluster-connectivity start and network interface check cluster-connectivity show

cluster1::*> network interface check cluster-connectivity start

NOTE: Wait for a number of seconds before running the show command to display the details.

cluster1::*> network interface check cluster-connectivity show
                                  Source           Destination      Packet
Node   Date                       LIF              LIF              Loss
------ -------------------------- ---------------- ---------------- -----------
node1
       3/5/2022 19:21:18 -06:00   node1_clus2      node2-clus1      none
       3/5/2022 19:21:20 -06:00   node1_clus2      node2_clus2      none
node2
       3/5/2022 19:21:18 -06:00   node2_clus2      node1_clus1      none
       3/5/2022 19:21:20 -06:00   node2_clus2      node1_clus2      none
All ONTAP releases

For all ONTAP releases, you can also use the cluster ping-cluster -node <name> command to check the connectivity:

cluster ping-cluster -node <name>

cluster1::*> cluster ping-cluster -node local
Host is node2
Getting addresses from network interface table...
Cluster node1_clus1 169.254.209.69 node1 e0a
Cluster node1_clus2 169.254.49.125 node1 e0b
Cluster node2_clus1 169.254.47.194 node2 e0a
Cluster node2_clus2 169.254.19.183 node2 e0b
Local = 169.254.47.194 169.254.19.183
Remote = 169.254.209.69 169.254.49.125
Cluster Vserver Id = 4294967293
Ping status:

Basic connectivity succeeds on 4 path(s)
Basic connectivity fails on 0 path(s)

Detected 9000 byte MTU on 4 path(s):
Local 169.254.47.194 to Remote 169.254.209.69
Local 169.254.47.194 to Remote 169.254.49.125
Local 169.254.19.183 to Remote 169.254.209.69
Local 169.254.19.183 to Remote 169.254.49.125
Larger than PMTU communication succeeds on 4 path(s)
RPC status:
2 paths up, 0 paths down (tcp check)
2 paths up, 0 paths down (udp check)

  1. Change the privilege level back to admin:

    set -privilege admin

  2. If you suppressed automatic case creation, reenable it by invoking an AutoSupport message:

    system node autosupport invoke -node * -type all -message MAINT=END

What's next?

Configure switch health monitoring.