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This section describes the configuration of static anycast address for seamless migration of hosts and virtual machines. Static Anycast Gateway (SAG) allows multiple switches to simultaneously route packets using a common gateway address in an active/active router configuration. Each switch is configured with the same set of anycast virtual IP address and anycast virtual MAC address. For multiple tenants, configure VLAN and VRF for each tenant. Enable ARP suppression to reduce network flooding in VxLAN network caused by broadcast traffic from ARP requests. When an end host sends ARP request for another end-host, the local VTEP responds with ARP reply by maintaining a table of MAC/IP bindings for the associated VNI in each VTEP. The following tables provide a description of important scripts.
Configuration | Description |
ip anycast-address enable ip anycast-mac-address 00:11:11:11:11:11 | Enable static anycast-address and anycast MAC address
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ip vrf mgmt ip vrf VrfTenant1 ip vrf VrfTenant2 | Assign VRF per tenant |
interface Vlan 101 description "Tenant-1 Compute VM" neigh-suppress ip vrf forwarding VrfTenant1 ip anycast-address 192.168.10.254/24 | Enable neighbor ARP suppression Assign host VLANs to each tenant VRF Assign anycast IP address on each participating VLAN |
interface Ethernet16 description "Connected to Tenant-1 Compute" no shutdown switchport access Vlan 101 exit | Assign access VLAN to host connected interface
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Fabric-A-Leaf1 | Fabric-A-Spine1 | Fabric-A-BL1 |
configure terminal ip anycast-address enable ip anycast-mac-address 00:11:11:11:11:11 ip vrf mgmt ip vrf VrfTenant1 ip vrf VrfTenant2 interface Vlan 101 description "Tenant-1 Compute VM" neigh-suppress ip vrf forwarding VrfTenant1 ip anycast-address 192.168.10.254/24 exit interface Vlan 201 description "Tenant-2 Compute VM" neigh-suppress ip vrf forwarding VrfTenant2 ip anycast-address 192.168.20.254/24 exit interface Ethernet16 description "Connected to Tenant-1 Compute" no shutdown switchport access Vlan 101 exit interface Ethernet20 description "Connected to Tenant-2 Compute" no shutdown switchport access Vlan 201 exit | configure terminal ip vrf mgmt | configure terminal ip anycast-address enable ip anycast-mac-address 00:11:11:11:11:11 ip vrf mgmt ip vrf VrfTenant1 ip vrf VrfTenant2 interface Vlan 101 description "Tenant-1 Compute VM" neigh-suppress ip vrf forwarding VrfTenant1 ip anycast-address 192.168.10.254/24 exit interface Vlan 201 description "Tenant-2 Compute VM" neigh-suppress ip vrf forwarding VrfTenant2 ip anycast-address 192.168.20.254/24 exit interface Ethernet16 description "Connected to Tenant-1 Compute" no shutdown switchport access Vlan 101 exit interface Ethernet20 description "Connected to Tenant-2 Compute" no shutdown switchport access Vlan 201 exit |
Fabric-B-Leaf1 | Fabric-B-Spine1 | Fabric-B-BL1 |
configure terminal ip anycast-address enable ip anycast-mac-address 00:22:22:22:22:22 ip vrf mgmt ip vrf VrfTenant1 ip vrf VrfTenant2 interface Vlan 101 description "Tenant-1 Compute VM" neigh-suppress ip vrf forwarding VrfTenant1 ip anycast-address 192.168.50.254/24 exit interface Vlan 201 description "Tenant-2 Compute VM" neigh-suppress ip vrf forwarding VrfTenant2 ip anycast-address 192.168.60.254/24 exit interface Ethernet0 description "Connected to Tenant-1 Compute" no shutdown switchport access Vlan 101 exit interface Ethernet1 description "Connected to Tenant-2 Compute" no shutdown switchport access Vlan 201 exit
| configure terminal ip vrf mgmt. | configure terminal ip anycast-address enable ip anycast-mac-address 00:22:22:22:22:22 ip vrf mgmt ip vrf VrfTenant1 ip vrf VrfTenant2 interface Vlan 101 description "Tenant-1 Compute VM" neigh-suppress ip vrf forwarding VrfTenant1 ip anycast-address 192.168.50.254/24 exit interface Vlan 201 description "Tenant-2 Compute VM" neigh-suppress ip vrf forwarding VrfTenant2 ip anycast-address 192.168.60.254/24 exit interface Ethernet0 description "Connected to Tenant-1,2 Compute" no shutdown switchport access Vlan 101 exit interface Ethernet4 description "Connected to Tenant-2 Compute" no shutdown switchport access Vlan 201 exit |