Cisco Cisco Virtual Managed Services 1.02 Troubleshooting Guide
6. Elastic Services Controller (ESC)
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6.3 High-Availability
ESC has the capability to provide high availability in a one-to-one configuration. ESC HA deployment has two
network variations and two database variations.
network variations and two database variations.
Simple Network HA
The first of the network variations is the Simple Network HA. In this scenario, both the ESC VMs are on the
same network and use keep-alive messages to check on health and determine which ESC instance is MASTER
and which one is BACKUP.
same network and use keep-alive messages to check on health and determine which ESC instance is MASTER
and which one is BACKUP.
Keep-alive messages run on the southbound interface of the ESC.
Figure 6.2 ESC High-Availability - Simple Network HA
HA with BGP
In a second network variation, each ESC has northbound interfaces towards NSO on separate L2 domains
with separate subnets. BGP is used to advertise an Anycast address for the NSO to use to connect to the ESC.
with separate subnets. BGP is used to advertise an Anycast address for the NSO to use to connect to the ESC.