Layer-2 Traffic in VLT DomainsIn a VLT domain, the MAC address of any host connected to the VLT peers is synchronized between the VLT nodes. In the followingexample, VLAN 10 is spanned across three VLT domains.Figure 134. Layer-2 Traffic in VLT DomainsIf 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. MACsynchronization 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 PeersYou can use the following commands to verify the MAC synchronization between VLT peers:VLT-10-PEER-1#show mac-address-table countMAC Entries for all vlans :Dynamic Address Count : 1007Static Address (User-defined) Count : 1Sticky Address Count : 0Total Synced Mac from Peer(N): 503Total MAC Addresses in Use: 1008VLT-10-PEER-1#show vlt counter macTotal MAC VLT counters----------------------L2 Total MAC-Address Count: 1007VLT-10-PEER-1#show mac-address-tableCodes: *N - VLT Peer Synced MACVlanId Mac Address Type Interface State10 00:00:4c:54:8b:f6 Dynamic Po 11 Active10 00:01:e8:95:ec:97 Dynamic Po 33 Active10 00:01:e8:b3:ba:47 Dynamic Po 33 Active30 a0:00:a1:00:00:01 Dynamic Po 11 Active30 a0:00:a1:00:00:02 Dynamic Po 11 Active30 a0:00:a1:00:00:03 Dynamic Po 11 Active30 a0:00:a1:00:00:04 Dynamic (N) Po 11 Active30 a0:00:a1:00:00:05 Dynamic (N) Po 11 Active30 a0:00:a1:00:00:06 Dynamic (N) Po 11 ActiveVirtual Link Trunking (VLT) 921
