Provisioning
Provisioning allows for the bidirectional (WAN Ingress/WAN Egress) distribution of bandwidth for a WAN Link among the various services associated with that WAN Link.
- Provisioning Groups: Create and edit groups of bandwidth. (Optional)
- Services: View and edit bandwidth settings for services within a bandwidth group
The Concept of Using Shares
When provisioning bandwidth for networks with a large number of sites, using percentages does not allow for enough granularity as the site count increases. With the SD-WAN Edge provisioning process, we introduce the concept of Fair Shares. Shares are used to distribute the permitted bandwidth over groups, and services within groups.
With shares, the total number of shares is up to the user, allowing any amount of granularity or precision when allocating bandwidth among the different Groups and Services.
Shares are discussed in more detail in the 'Services' sections.
Provisioning Groups
A Provisioning Group is a container for an arbitrary collection of Services on any given WAN Link. They allow the user to allocate bandwidth at a high-level before drilling down to the individual Services within the Group for fine-tuning. They also provide a boundary for the automatic redistribution of bandwidth within the child Services of the Provisioning Group.
NOTE: Provisioning Groups are available to simplify the provisioning process and are not required if they are not needed.
Fair Shares
In the Provisioning Groups table, shares are used to distribute the WAN Ingress/Egress eligible bandwidth, which is the Permitted Rate minus the total Min reserved bandwidth of all Services on the WAN Link. All Services are initially assigned to a Default Group that is allocated all of the eligible bandwidth. The user can create additional Groups and allocate bandwidth to its members by giving that Group some number of Fair Shares. The resulting total bandwidth for all Services in the Group is then shown in the Fair (Kbps) column.
NOTE: All Services receive their Min Reserved Bandwidth before Fair distribution, which could result in Groups with equal Fair Shares having disparate Fair Rates. Fair Rates can also be affected by Service Maximums, if defined.
Services
The Services section allows the user to further fine-tune bandwidth allocation. Services that are assigned to the same group contend for the bandwidth allocated to that group. The services shown in the Services section of the selected WAN Link have been enabled on that WAN Link by the current Configuration.
By default, all services are assigned to the Default group with a default number of fair shares divided evenly among them. The default number of shares serves as a starting point and is not restricted by (nor related to) the number of shares set in the Provisioning Groups section.
s_fs / sg_fs * g_fs- s_fs is the service's fair share as shown in the "Shares of Group" column.
- sg_fs is the sum of the "Shares of Group" for all the services in the same group.
- g_fs is the "Fair Share" value in the Groups table for the service's group.
The result is rounded.
Note:
This is the value that is shown in the View Configuration->WAN Links page as "Computed wan_egress_rate_fair_share" and "Computed wan_ingress_rate_fair_share".- Conduit: 80 Kbps (including Dynamic Conduit type)
- Internet/Intranet: 100 Kbps
Note:
To set an unlimited Max (Kbps) rate, enter '0' (zero) into the cell.For the Dynamic Conduits service entry (if configured on the selected WAN Link), the Min (Kbps) and Max (Kbps) fields are variable. Therefore, the range of values that can be expected is shown.
Shares of Group
In the Services section, shares are again used to distribute the eligible WAN Ingress/Egress bandwidth. The Group that a service is assigned to determines the eligible bandwidth (listed in the Fair (Kbps) column in the Provisioning Groups section) for all services assigned to the same Group. The Shares of Group are used to divide up the eligible bandwidth among the members of a group based on the ratio of the current service divided by the total number of shares for the group in which it is a member.
The Minimum rate acts as a base bandwidth allocation for each service, and the amount of bandwidth available for fair allocation is based on the total permitted for the group minus the sum of the minimums for each service in the group.
In the case of the Dynamic Conduits service, the Shares of Group is divided among all Dynamic Conduits. Please refer to the context help for Dynamic Conduit Provisioning for more information.
New services enabled on a WAN Link will be placed in the Default Group with a Shares of Group value of 0 (zero). The Shares of Group must be configured to a non-zero value in order to be valid.
When moving a service between Groups, the Service will keep its configured amount of shares. The shares will be removed from the old group and taken to the new Group.
When deleting or disabling a service on a WAN Link, that service's shares will be removed as well. The shares will not be distributed over the remaining services.
Dynamic Conduit Provisioning
The Dynamic Conduit Provisioning worksheet is for configuring the parameters of an individual Dynamic Conduit. If a Dynamic Conduit service is not enabled on the selected WAN Link, the worksheet will be hidden.
The settings in this worksheet should be treated in the same way as a static Conduit service. Set the Min (Kbps) and Max (Kbps) for an individual Dynamic Conduit here. Each Dynamic Conduit will use the settings provisioned here. Once the Min (Kbps) and Max (Kbps) rates have been configured, the Fair (Kbps) per Dynamic Conduit will be recalculated to reflect the new settings.
Using the Possible Dynamic Conduits and the individual Dynamic Conduit settings in this worksheet, worst-case usages of Min, Max and Fair bandwidth will be calculated. The worst-case Min and Max bandwidth will be shown in the Min Total (Kbps) and Max Total (Kbps) columns (respectively) in the Dynamic Conduit Provisioning worksheet. The worst-case fair bandwidth will be shown in the Fair (Kbps) column of the main Services table for the Dynamic Conduits service.
NOTE: To set an unlimited Max (Kbps) rate, enter '0' (zero) into the cell.
About the Possible Dynamic Conduits column:
The Possible Dynamic Conduits value represents the total number of Dynamic Conduits that could exist simultaneously (based on the current Configuration described momentarily). It is either the total number of sites reachable via Dynamic Conduit OR the maximum number of Dynamic Conduits supported by the platform being configured, whichever is fewer. Several Configuration parameters cooperate to determine if Dynamic Conduits can be created between sites. Sites that have: Dynamic Conduits enabled AND share a common intermediate site with W-T-W Forwarding enabled AND are in the same W-T-W Forwarding group; can establish Dynamic Conduits between each other and are factored into the Possible Dynamic Conduits value.
Fair (Kbps)
The fair bandwidth is based on a worst-case scenario in which all accounted Dynamic Conduits are up simultaneously. The number of shares for an individual Dynamic Conduit are used in the calculation. The number of shares for an individual Dynamic Conduit receives in the worst-case is equal to the number of Shares of Group defined for the Dynamic Conduits service divided by the Possible Dynamic Conduits:
For example, if the Dynamic Conduits service has 100,000 shares defined for it in the Shares of Group column in the Services table, and if the current Configuration accounted for a Possible Dynamic Conduits of 4, then 25,000 shares (100,000 / 4) will be used as the number of fair shares for an individual Dynamic Conduit.
Once the worst-case number of shares has been calculated, the Fair (Kbps) rate is calculated in the same manner as the other service types.
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