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[[Main Page|Home]] > [[Switch configuration notes]] > [[Configure VLT between two Dell S4128T-on or S4128F-on switches]]

=VLT configuration=

To configure VLT between two Dell S4128T-on switches use following steps:
# Connect to switch using console
# Configure management IP on OOBE management interfaces (eg 1.1.1.1 and 1.1.1.2) in below example
## Configure management IP on first switch
##:<pre>
##:: interface mgmt1/1/1
##::    no shutdown
##::    no ip address dhcp
##::    ip address 1.1.1.1/30
##::    ipv6 address autoconfig
##:</pre>
## Configure management IP on second switch
##:<pre> 
##:: interface mgmt1/1/1
##::     no shutdown
##::     no ip address dhcp
##::     ip address 1.1.1.2/30
##::   ipv6 address autoconfig
##:</pre> 
# Ensure back to back management connectivity between two switches.   After that if you are connected to console of first switch, you can get access to second switch via:
#:<pre>
#:: system bash
#:: ssh admin@10.1.1.2
#:</pre>
# Assuming we will use interfaces 25 and 26 on both switches for VLT.  Configure all the four interfaces (25,26 on switch1 and 25,26 on switch 2) as:
#:<pre>
#:: interface ethernet1/1/25
#::    description VLTi
#::    no shutdown
#::    no switchport
#::    flowcontrol receive on
#:</pre>
# Configure VLT on first switch using interfaces 25 and 26 using:
#:<pre>
#:: vlt-domain 1
#::    backup destination 1.1.1.2
#::    discovery-interface ethernet1/1/25-1/1/26
#::    peer-routing
#::    primary-priority 1
#:</pre>
# Configure VLT on second switch using interfaces 25 and 26 using:
#:<pre>
#:: vlt-domain 1
#::    backup destination 1.1.1.1
#::    discovery-interface ethernet1/1/25-1/1/26
#::    peer-routing
#::    primary-priority 2
#:</pre>
# After this the VLT status should be up which can be validated with
#:<pre>
#:: show vlt 1
#:</pre>
#: Example output
#::<pre>
#::: Domain ID                              : 1
#::: Unit ID                                : 1
#::: Role                                   : primary
#::: Version                                : 3.1
#::: Local System MAC address               : f0:d4:e2:5f:f4:0f
#::: Role priority                          : 1
#::: VLT MAC address                        : f0:d4:e2:5f:f4:0f
#::: IP address                             : fda5:74c8:b79e:1::1
#::: Delay-Restore timer                    : 90 seconds
#::: Peer-Routing                           : Enabled
#::: Peer-Routing-Timeout timer             : 0 seconds
#::: Multicast peer-routing timer           : 300 seconds
#::: VLTi Link Status
#:::     port-channel1000                   : up
#::: 
#::: VLT Peer Unit ID    System MAC Address    Status    IP Address             Version
#::: ----------------------------------------------------------------------------------
#:::   2                 f0:d4:e2:5f:da:0f      up       fda5:74c8:b79e:1::2     3.1
#:</pre>
# You can check whether back-to-back management connectivity is working properly or not using:
#:<pre>
#:: show vlt 1 backup-link
#:</pre>
#: Example output
#::<pre>
#::: VLT Backup Link
#::: ------------------------
#::: Destination                    : 1.1.1.2
#::: Peer Heartbeat status          : Up
#::: Heartbeat interval             : 30
#::: Heartbeat timeout              : 90
#::: Destination VRF                : default
#::</pre>
# Finally you can check VLT configuration is done properly or not using:
#:<pre>
#:: show vlt 1 mismatch
#:</pre>


=VRRP configuration=
After VLT configuration is done we can do VRRP between two switches such as:

'''Switch1:'''
<pre>
config t
    interface vlan <vlan-id>
       ip address 172.17.22.61/22 
       vrrp-group <vlan-id>
          virtual-address 172.17.22.62
          exit
</pre>

'''Switch2:'''
<pre>
config t
    interface vlan <vlan-id>
        ip address 172.17.22.60/22 
        vrrp-group <vlan-id>
           virtual-address 172.17.22.62
           exit
</pre>
By keeping VLAN-ID and vrrp-group same we can ensure that we use same vrrp-group for same VLAN and accidentally do not mix vrrp-group number for different VLANs.



=Port-channel configuration=
We can configure port-channel to do LACP between two switches in VLT to a remote switch (switch pair) using:

'''Switch1:''':
<pre>
config t
    interface portchannel <interface-id>
        description ABCD
        switchport mode trunk
        switchport trunk allowed VLAN 1,10,100
        vlt-port-channel <interface-id>
        mtu 9216
        no shut
   interface ethernet <interface-id>
       description part of channel-group <interface-id> 
       no switchport
       channel-group <interface-id> mode active
       no shut
</pre>

Similarly on '''Switch2:''':
<pre>
config t
    interface portchannel <interface-id>
        description ABCD
        switchport mode trunk
        switchport trunk allowed VLAN 1,10,100
        vlt-port-channel <interface-id>
        mtu 9216
        no shut
   interface ethernet <interface-id>
       description part of channel-group <interface-id> 
       no switchport
       channel-group <interface-id> mode active
       no shut
</pre>

Then see status using:
<pre>
show port-channel summary
</pre>




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