This document describes the configuration guide on how to deploy CSR1000v routers for High Availability on Amazon AWS cloud. It is aimed to give users practical knowledge of HA and the ability to deploy a fully functional testbed.
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ENI - The network interface ID of the CSR 1000v gigabit interface to which traffic is routed.For Example, if CSRHA fails then CSRHA1 takes over and updates the route in the AWS route table to point to its own ENI.
The CSR1000v is used as a proxy to call AWS API commands to modify the route table. By default, AMI's are not allowed access to APIs. This procedure creates an IAM role and this role is used during the launch of a CSR instance. IAM provides the access credentials for CSRs to use and modify AWS APIs.
Configure the Generic Routing Encapsulation (GRE) tunnel through the Elastic IPs of the CSR 1000v's (recommended to avoid DHCP lease renewal issues, which detect false failures.) The Biderection Forwarding Detection (BFD) values can be configured to be more aggressive than those shown in this example, if faster convergence is required. However, this can lead to BFD peer down events during intermittent connectivity. The values in this example detects peer failure within 1.5 seconds. There is a variable delay of about a few seconds between the time when the AWS API command is executed and when the VPC routing table changes go into effect.
Monitor BFD peer down events by configuring each CSR 1000v using the cloud provider aws command specified below. Use this command to define the routing changes to (VPC) Route-table-id, Network-interface-id and CIDR after an AWS HA error such as BFD peer down, is detected.
_CSR1000v_Configuration_Guide/b_CSR1000v_Configuration_Guide_chapter_01000.html#con_1055118 and navigate to Table 4. in this link "Cisco CSR 1000v Network Stack Licenses". Choose or purchase your desired license. 2ff7e9595c
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