Administrator Guide

If Host 1 from a VLT domain sends a frame to Host 2 in another VLT domain, the frame can use any link shown to reach Host 2. MAC
synchronization between VLT peers handles the traffic flow even if it is hashed and forwarded through the other member of the port-
channel.
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.
Virtual Link Trunking (VLT)
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