Connectivity Guide

• Server racks, Rack 1 and Rack 2, are part of data centers DC1 and DC2, respectively.
• Rack 1 is connected to devices A1 and B1 in L2 network segment.
• Rack 2 is connected to devices A2 and B2 in L2 network segment.
• A VLT LAG is present between A1 and B1 as well as A2 and B2.
• A1 and B1 connect to core routers, C1 and D1 with VLT routing enabled.
• A2 and B2 connect to core routers, C2 and D2, with VLT routing enabled.
• The data centers are connected through a direct link or eVLT.
• The core routers C1 and D1 in the local VLT domain connect to the core routers C2 and D2 in the remote VLT domain using VLT links.
• The core routers C1 and D1 in local VLT domain along with C2 and D2 in the remote VLT domain are part of an L3 cloud.
• The core routers C1, D1, C2, D2 are in a VRRP group with the same vrrp-group ID.
When a virtual machine running in Server Rack 1 migrates to Server Rack 2, L3 packets for that VM are routed without interruption.
Sample conguration of C1:
• Congure VRRP on L2 links between core routers:
C1(config)# interface vlan 100
C1(conf-if-vl-100)# ip address 10.10.100.1/24
C1(conf-if-vl-100)# vrrp-group 10
C1(conf-vlan100-vrid-10)# priority 250
C1(conf-vlan100-vrid-10)# virtual-address 10.10.100.5
842
Virtual Link Trunking