• Author : Tarun Soin

 
 

Cloud High Availability

Cloud HA feature provides active-active redundancy between two vEOS router instances running in Cloud such as AWS and Azure. Typical deployments will instantiate a pair of vEOS instances in different fault domains/Availability zones of a logical network ( e.g AWS Virtual Private Network( VPC) or Azure Virtual Network ) within a Cloud Provider’s network. The vEOS instances will be used to route traffic to/from cloud hosted VM instances in partitioned subnets which are logically deployed behind each of the vEOS router. The Cloud HA feature allows the vEOS router to back-up each other in case of either peer failure or...
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MLAG Dual Primary Detection

When MLAG peer-link goes down, the secondary peer assumes the primary peer is down/dead, and takes over the primary role. It is possible that when peer-link is down, the primary isn’t actually down/dead and both MLAG peers think they are the primary. This is called “dual-primary” condition/state. In this state, each peer will run Layer-2 protocols such as Spanning Tree Protocol independently. Depending on the topology, this can cause loops in the network. This can also impact IGMP snooping feature. The Dual Primary Detection feature uses the management interface as an out-of-band connection between the two peers along with the peer-link. Once configured, the MLAG peers will send...
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