Active-Active VLAG with Link-State Layer 3 Unicast Protocols 


There are VLAG egress filtering rules for packets ingressing cluster links that prevent packets from egressing VLAGs. In addition to the properties of control packets in unicast routing protocols, such as OSPF, that set TTL=1, make it difficult to support routing protocols from creating Layer3 adjacencies over VLAGs. This feature allows unicast routing protocols such as OSPF to form Layer3 adjacencies over VLAGs, by implementing a dual-forwarder logic, while at the same time allowing routing control packets to be directed to the right cluster switch. This feature is enabled by default, but you enable or disable it on a per vRouter basis. When the feature is ON, the cluster vRouter implements special logic to synchronize vRouter gateway MAC addresses as well as vrouter interface IP addresses with the cluster peer.


When you configure the ports for active-active VLAG, you should use the port-config-modify command and add the parameter jumbo to support jumbo frames on the network.


CLI (network-admin@spine1) > vrouter-modify vrouter-name name-string cluster-active-active-routing|no-cluster-active-active-routing


To display the configuration, use the vrouter-show command:


CLI (network-admin@spine1) > vrouter-show


switch...cluster-active-active-routing...

------   ---------------------   

spine1   enable