Setup Guide

Viewing the MAC Synchronization Between VLT Peers
You can use the following commands to verify the MAC synchronization between VLT peers:
VLT-10-PEER-1#show mac-address-table count
MAC Entries for all vlans :
Dynamic Address Count : 1007
Static Address (User-defined) Count : 1
Sticky Address Count : 0
Total Synced Mac from Peer(N): 503
Total MAC Addresses in Use: 1008
VLT-10-PEER-1#show vlt counter mac
Total MAC VLT counters
----------------------
L2 Total MAC-Address Count: 1007
VLT-10-PEER-1#show mac-address-table
Codes: *N - VLT Peer Synced MAC
VlanId Mac Address Type Interface State
10 00:00:4c:54:8b:f6 Dynamic Po 11 Active
10 00:01:e8:95:ec:97 Dynamic Po 33 Active
10 00:01:e8:b3:ba:47 Dynamic Po 33 Active
30 a0:00:a1:00:00:01 Dynamic Po 11 Active
30 a0:00:a1:00:00:02 Dynamic Po 11 Active
30 a0:00:a1:00:00:03 Dynamic Po 11 Active
30 a0:00:a1:00:00:04 Dynamic (N) Po 11 Active
30 a0:00:a1:00:00:05 Dynamic (N) Po 11 Active
30 a0:00:a1:00:00:06 Dynamic (N) Po 11 Active
30 a0:00:a1:00:00:07 Dynamic (N) Po 11 Active
30 a0:00:a1:00:00:08 Dynamic (N) Po 11 Active
30 a0:00:a1:00:00:09 Dynamic (N) Po 11 Active
30 a0:00:a1:00:00:0a Dynamic (N) Po 11 Active
30 a0:00:a1:00:00:0b Dynamic (N) Po 11 Active
30 a0:00:a1:00:00:0c Dynamic Po 11 Active
VLT-10-PEER-2#show vlt statistics mac
VLT MAC Statistics
--------------------
L2 Info Pkts sent:0, L2 Mac-sync Pkts Sent:7
L2 Info Pkts Rcvd:0, L2 Mac-sync Pkts Rcvd:9
L2 Reg Request sent:0
L2 Reg Request rcvd:0
L2 Reg Response sent:0
L2 Reg Response rcvd:0
Note that the MAC address synchronized by a VLT peer is differentiated with an (N) flag in the example output.
Interspersed VLANs
In Dell EMC Networking OS, the same VLAN across many racks can be extended by configuring layer-3 VLANs across the VLT
nodes and the ToR switches. Spanning the VLANs in an eVLT architecture could interconnect and aggregate multiple racks with
the same VLAN. With routed VLT, you can configure a VLAN as layer 3 in a VLT domain and as layer 2 VLAN in all other VLT
domains. By configuring a VLAN as layer 3 in a VLT domain and as layer 2 VLAN in all other VLT domains, you can confine the
ARP entries to one particular VLT domain.
At the core/aggregation layer VLT domain, you can configure common layer 3 VLANs for inter VLAN routing within the VLT
domain.
VLT on Core Switches
Uplinks from servers to the access layer and from access layer to the aggregation layer are bundled in LAG groups with
end-to-end Layer 2 multipathing. This set up requires “horizontal” stacking at the access layer and VLT at the aggregation layer
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Virtual Link Trunking (VLT)