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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Verifying a VLT Configuration

To monitor the operation or verify the configuration of a VLT domain, use any of the following show commands on the primary and secondary VLT switches.

  • Display information on backup link operation.
    EXEC mode
    show vlt backup-link
  • Display general status information about VLT domains currently configured on the switch.
    EXEC mode
    show vlt brief
  • Display detailed information about the VLT-domain configuration, including local and peer port-channel IDs, local VLT switch status, and number of active VLANs on each port channel.
    EXEC mode
    show vlt detail
  • Display the VLT peer status, role of the local VLT switch, VLT system MAC address and system priority, and the MAC address and priority of the locally-attached VLT device.
    EXEC mode
    show vlt role
  • Display the current configuration of all VLT domains or a specified group on the switch.
    EXEC mode
    show running-config vlt
  • Display statistics on VLT operation.
    EXEC mode
    show vlt statistics
  • Display the RSTP configuration on a VLT peer switch, including the status of port channels used in the VLT interconnect trunk and to connect to access devices.
    EXEC mode
    show spanning-tree rstp
  • Display the current status of a port or port-channel interface used in the VLT domain.
    EXEC mode
    show interfaces interface
    • interface: specify one of the following interface types:
      • For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port/subport[/subport] information.
      • For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the slot/port information.
      • For a port channel interface, enter the keywords port-channel then a number.

Examples of the show vlt and show spanning-tree rstp Commands

The following example shows the show vlt backup-link command.

Dell_VLTpeer1# show vlt backup-link

VLT Backup Link
-----------------
Destination:                 10.11.200.18
Peer HeartBeat status:       Up
HeartBeat Timer Interval:    1
HeartBeat Timeout:           3
UDP Port:                    34998
HeartBeat Messages Sent:     1026
HeartBeat Messages Received: 1025

Dell_VLTpeer2# show vlt backup-link

VLT Backup Link
-----------------
Destination:                 10.11.200.20
Peer HeartBeat status:       Up
HeartBeat Timer Interval:    1
HeartBeat Timeout:           3
UDP Port:                    34998
HeartBeat Messages Sent:     1030
HeartBeat Messages Received: 1014

The following example shows the show vlt brief command.

DellEMC#show vlt brief
VLT Domain Brief
------------------
 Domain ID                               : 1
 Role                                    : Secondary
 Role Priority                           : 32768
 ICL Link Status                         : Up
 HeartBeat Status                        : Up
 VLT Peer Status                         : Up
 Version                                 : 6(3)
 Local System MAC address                : 00:01:e8:8a:e9:91
 Remote System MAC address               : 00:01:e8:8a:e9:76
 Remote system version                   : 6(3)
 Delay-Restore timer                     : 90 seconds

 Delay-Restore Abort Threshold           : 60 seconds
 Peer-Routing                            : Disabled
 Peer-Routing-Timeout timer              : 0 seconds
 Multicast peer-routing timeout          : 150 seconds
 DellEMC#

The following example shows the show vlt detail command.

Dell_VLTpeer1# show vlt detail

Local LAG Id Peer LAG Id Local Status Peer Status Active VLANs
------------ ----------- ------------ ----------- -------------
100          100         UP            UP         10, 20, 30
127          2           UP            UP        20, 30

Dell_VLTpeer2# show vlt detail

Local LAG Id Peer LAG Id Local Status Peer Status Active VLANs
------------ ----------- ------------ ----------- -------------
2            127         UP           UP          20, 30
100          100         UP           UP          10, 20, 30

The following example shows the show vlt role command.

Dell_VLTpeer1# show vlt role

VLT Role
----------
VLT Role:                   Primary
System MAC address:         00:01:e8:8a:df:bc
System Role Priority:       32768
Local System MAC address:   00:01:e8:8a:df:bc
Local System Role Priority: 32768

Dell_VLTpeer2# show vlt role

VLT Role
----------
VLT Role:                   Secondary
System MAC address:         00:01:e8:8a:df:bc
System Role Priority:       32768
Local System MAC address:   00:01:e8:8a:df:e6
Local System Role Priority: 32768

The following example shows the show running-config vlt command.

Dell_VLTpeer1# show running-config vlt
!
vlt domain 30
  peer-link port-channel 60
  back-up destination 10.11.200.18

Dell_VLTpeer2# show running-config vlt
!
vlt domain 30
  peer-link port-channel 60
  back-up destination 10.11.200.20

The following example shows the show vlt statistics command.

Dell_VLTpeer1# show vlt statistics

VLT Statistics
----------------
HeartBeat Messages Sent:     987
HeartBeat Messages Received: 986
ICL Hello's Sent:            148
ICL Hello's Received:        98

Dell_VLTpeer2# show vlt statistics

VLT Statistics
----------------
HeartBeat Messages Sent:     994
HeartBeat Messages Received: 978
ICL Hello's Sent:            89
ICL Hello's Received:        89

The following example shows the show spanning-tree rstp command.

The bold section displays the RSTP state of port channels in the VLT domain. Port channel 100 is used in the VLT interconnect trunk (VLTi) to connect to VLT peer2. Port channels 110, 111, and 120 are used to connect to access switches or servers (vlt).

Dell_VLTpeer1# show spanning-tree rstp brief

Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 0, Address 0001.e88a.dff8
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 4096, Address 0001.e88a.d656
Configured hello time 2, max age 20, forward delay 15

Interface                                  Designated
Name   PortID  Prio Cost  Sts Cost   Bridge ID PortID
---------- -------- ---- ------- --------- ------- ------------------
Po 1   128.2   128 200000 DIS       800   4096   0001.e88a.d656 128.2
Po 3   128.4   128 200000 DIS       800   4096   0001.e88a.d656 128.4
Po 4   128.5   128 200000 DIS       800   4096   0001.e88a.d656 128.5
Po 100 128.101 128 800    FWD(VLTi) 800   0      0001.e88a.dff8 128.101
Po 110 128.111 128 00     FWD(vlt)  800   4096   0001.e88a.d656 128.111
Po 111 128.112 128 200000 DIS(vlt)  800   4096   0001.e88a.d656 128.112
Po 120 128.121 128 2000   FWD(vlt)  800   4096   0001.e88a.d656 128.121

Dell_VLTpeer2# show spanning-tree rstp brief

Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 0, Address 0001.e88a.dff8
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 0, Address 0001.e88a.dff8
We are the root
Configured hello time 2, max age 20, forward delay 15

Interface                                  Designated
Name   PortID  Prio Cost  Sts      Cost    Bridge ID PortID
---------- -------- ---- ------- -------- - ------- -------------
Po 1   128.2   128 200000 DIS      0   0   0001.e88a.dff8 128.2
Po 3   128.4   128 200000 DIS      0   0   0001.e88a.dff8 128.4
Po 4   128.5   128 200000 DIS      0   0   0001.e88a.dff8 128.5
Po 100 128.101 128 800    FWD(VLTi)0   0   0001.e88a.dff8 128.101
Po 110 128.111 128 00     FWD(vlt) 0   0   0001.e88a.dff8 128.111
Po 111 128.112 128 200000 DIS(vlt) 0   0   0001.e88a.dff8 128.112
Po 120 128.121 128 2000   FWD(vlt) 0   0   0001.e88a.dff8 128.121

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