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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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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:
      • Fast Ethernet: enter fastethernet slot/port .
      • 10-Gigabit Ethernet: enter tengigabitethernet slot/port .
      • Port channel: enter port-channel {1-128}.

Example of 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

Example of the show vlt brief Command 

Dell#show vlt br
                                 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
                                 Dell#

Example of 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

Example of 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

Example of 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

Example of 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

Example of 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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