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Merge pull request #95358 from vhorne/ag-v2
add waf custom rules to comparison
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articles/application-gateway/application-gateway-autoscaling-zone-redundant.md

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@@ -5,7 +5,7 @@ services: application-gateway
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author: vhorne
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ms.service: application-gateway
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ms.topic: article
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ms.date: 10/09/2019
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ms.date: 11/09/2019
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ms.author: victorh
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---
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**Example 2**
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An Application Gateway standard_v2 is provisioned for a month, with 0 minimum instances, and during this time it receives 25 new SSL connections/sec, average of 8.88-Mbps data transfer. Assuming connections are short lived, your price would be:
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An Application Gateway standard_v2 is provisioned for a month, with zero minimum instances, and during this time it receives 25 new SSL connections/sec, average of 8.88-Mbps data transfer. Assuming connections are short lived, your price would be:
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Fixed price = 744(hours) * $0.20 = $148.8
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Capacity unit price = 744(hours) * Max (25/50 compute unit for connections/sec, 8.88/2.22 capacity unit for throughput) * $0.008 = 744 * 4 * 0.008 = $23.81
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Total price = $148.8+23.81 = $172.61
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As you can see, you are only billed for 4 Capacity Units, not for the entire instance.
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As you can see, you are only billed for four Capacity Units, not for the entire instance.
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> [!NOTE]
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> The Max function returns the largest value in a pair of values.
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**Example 3**
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An Application Gateway standard_v2 is provisioned for a month, with a minimum of 5 instances. Assuming that there is no traffic and connections are short lived, your price would be:
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An Application Gateway standard_v2 is provisioned for a month, with a minimum of five instances. Assuming that there is no traffic and connections are short lived, your price would be:
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Fixed price = 744(hours) * $0.20 = $148.8
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Capacity unit price = 744(hours) * Max (0/50 compute unit for connections/sec, 0/2.22 capacity unit for throughput) * $0.008 = 744 * 50 * 0.008 = $297.60
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Total price = $148.80+297.60 = $446.4
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In this case, you are billed for the entirety of the 5 instances even though there is no traffic.
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In this case, you're billed for the entirety of the five instances even though there is no traffic.
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**Example 4**
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An Application Gateway standard_v2 is provisioned for a month, with a minimum of 5 instances, but this time there is an average of 125-mbps data transfer, and 25 SSL connections per second. Assuming that there is no traffic and connections are short lived, your price would be:
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An Application Gateway standard_v2 is provisioned for a month, with a minimum of five instances, but this time there is an average of 125-mbps data transfer, and 25 SSL connections per second. Assuming that there is no traffic and connections are short lived, your price would be:
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Fixed price = 744(hours) * $0.20 = $148.8
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Capacity unit price = 744(hours) * Max (25/50 compute unit for connections/sec, 125/2.22 capacity unit for throughput) * $0.008 = 744 * 57 * 0.008 = $339.26
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Total price = $148.80+339.26 = $488.06
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In this case, you are billed for the full 5 instances, plus 7 Capacity Units (which is 7/10 of an instance).
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In this case, you are billed for the full five instances, plus seven Capacity Units (which is 7/10 of an instance).
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**Example 5**
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Application Gateway and WAF can be configured to scale in two modes:
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- **Autoscaling** - With autoscaling enabled, the Application Gateway and WAF v2 SKUs scale up or down based on application traffic requirements. This mode offers better elasticity to your application and eliminates the need to guess the application gateway size or instance count. This mode also allows you to save cost by not requiring the gateway to run at peak provisioned capacity for anticipated maximum traffic load. You must specify a minimum and optionally maximum instance count. Minimum capacity ensures that Application Gateway and WAF v2 don't fall below the minimum instance count specified, even in the absence of traffic. Each instance counts as 10 additional reserved Capacity Units. 0 signifies no reserved capacity and is purely autoscaling in nature. Please note that 0 additional minimum instances still ensures high availability of the service which is always included with fixed price. You can also optionally specify a maximum instance count, which ensures that the Application Gateway doesn't scale beyond the specified number of instances. You'll continue to be billed for the amount of traffic served by the Gateway. The instance counts can range from 0 to 125. The default value for maximum instance count is 20 if not specified.
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- **Autoscaling** - With autoscaling enabled, the Application Gateway and WAF v2 SKUs scale up or down based on application traffic requirements. This mode offers better elasticity to your application and eliminates the need to guess the application gateway size or instance count. This mode also allows you to save cost by not requiring the gateway to run at peak provisioned capacity for anticipated maximum traffic load. You must specify a minimum and optionally maximum instance count. Minimum capacity ensures that Application Gateway and WAF v2 don't fall below the minimum instance count specified, even in the absence of traffic. Each instance counts as 10 additional reserved Capacity Units. Zero signifies no reserved capacity and is purely autoscaling in nature. Please note that zero additional minimum instances still ensures high availability of the service which is always included with fixed price. You can also optionally specify a maximum instance count, which ensures that the Application Gateway doesn't scale beyond the specified number of instances. You'll continue to be billed for the amount of traffic served by the Gateway. The instance counts can range from 0 to 125. The default value for maximum instance count is 20 if not specified.
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- **Manual** - You can alternatively choose Manual mode where the gateway won't autoscale. In this mode, if there is more traffic than what Application Gateway or WAF can handle, it could result in traffic loss. With manual mode, specifying instance count is mandatory. Instance count can vary from 1 to 125 instances.
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## Feature comparison between v1 SKU and v2 SKU
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| URL-based routing | ✓ | ✓ |
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| Multiple-site hosting | ✓ | ✓ |
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| Traffic redirection | ✓ | ✓ |
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| Web application firewall (WAF) | ✓ | ✓ |
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| Web Application Firewall (WAF) | ✓ | ✓ |
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| WAF custom rules | | ✓ |
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| Secure Sockets Layer (SSL) termination | ✓ | ✓ |
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| End-to-end SSL encryption | ✓ | ✓ |
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| Session affinity | ✓ | ✓ |

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