• Author : Tula Kraiser


7170 load balancer TCP probe support

Description The 7170 load balancer is a layer 4 load-balancer providing high packet processing throughput. Health monitoring probes the servers in the nexthop-groups to determine their administrative and operational states. This feature introduces the capability of using a TCP probe for the health check. The TCP probe results can be merged with an HTTP or HTTPS probe result to establish a server operational state. TCP probes work like the following: A TCP connection request with a destination port value as the one that is configured is sent to the server. If the connection succeeds the probe state is server operationally...
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7170 Load Balancer v4/v6 TOI

Description The primary challenge with using a switching ASIC as a load balancer has been how to deal with changes in the network topology without disrupting existing TCP connections. ASICs are very good at hashing multiple flows evenly across multiple devices; however, when the number of devices changes; it causes rehashing of flows causing many of them to be sent to a different device. In the case of TCP, this is fatal and results in the TCP connection being lost. Resilient ECMP hashing is a feature that prevents network-wide rehashing when a network device fails; however, this technique still causes...
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NSX Service nodes health monitoring via BFD tunnel

Vmware NSX Controllers expect Hardware VTEPs to monitor the liveness of the Replication Service Node via BFD.  In this release we have added support to do this. Arista switches select a live Replication Service Node to forward BUM (Broadcast/Unknown/Multicast) VXLAN traffic. NSX Service Nodes liveness is detected via BFD tunneled in a VXLAN packet. Vmware NSX deployments with multiple Replication Service Nodes used for high availability will benefit from this feature. Configuration The feature is configured by the Vmware NSX Controller.  The NSX Controller uses the existent HW VTEP Schema and OVSDB protocol for BFD Tunnel configuration. There is no special...
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