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Table Of Contents
● 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 configuration of C1:
● Configure 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
● Configure VLT port channel for VLAN 100:
C1(config)# interface port-channel 10
C1(conf-if-po-10)# vlt-port-channel 10
C1(conf-if-po-10)# switchport mode trunk
C1(conf-if-po-10)# switchport trunk allowed vlan 100
C1(conf-if-po-10)# exit
● Add members to port channel 10:
C1(config)# interface ethernet 1/1/3
C1(conf-if-eth1/1/3)# channel-group 10
C1(conf-if-eth1/1/3)# exit
C1(config)# interface ethernet 1/1/4
C1(conf-if-eth1/1/4)# channel-group 10
C1(conf-if-eth1/1/4)# exit
● Configure OSPF on L3 side of core router:
C1(config)# router ospf 100
C1(config-router-ospf-100)# redistribute connected
C1(conf-router-ospf-100)# exit
C1(config)# interface vlan 200
C1(conf-if-vl-200)# ip ospf 100 area 0.0.0.0
● Configure VLT port channel for VLAN 200:
C1(config)# interface port-channel 20
C1(conf-if-po-20)# vlt-port-channel 20
C1(conf-if-po-20)# switchport mode trunk
C1(conf-if-po-20)# switchport trunk allowed vlan 200
C1(conf-if-po-20)# exit
● Add members to port channel 20:
C1(config)# interface ethernet 1/1/5
C1(conf-if-eth1/1/5)# channel-group 20
C1(conf-if-eth1/1/5)# exit
C1(config)# interface ethernet 1/1/6
C1(conf-if-eth1/1/6)# channel-group 20
C1(conf-if-eth1/1/6)# exit
Sample configuration of D1:
● Configure VRRP on L2 links between core routers:
D1(config)# interface vlan 100
D1(conf-if-vl-100)# ip address 10.10.100.2/24
D1(conf-if-vl-100)# vrrp-group 10
D1(conf-vlan100-vrid-10)# virtual-address 10.10.100.5
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Virtual Link Trunking