service cloud-accel geodns anycast sharepoint enable
Enables GeoDNS optimization on the SteelHead appliance for servers supporting anycast IP lookup for SharePoint.
Syntax
[no] service cloud-accel geodns anycast sharepoint enable
Parameters
None
Usage
GeoDNS is used to locate the best SaaS server to the destination Exchange-online (Office 365) server. Microsoft now returns generic anycast IPs when resolving SharePoint hostnames (for example, rvbdtech.sharepoint.com). The responding server is usually close to the client rather than the data, which results in poor SteelHead optimization.
With this feature, the client-side SteelHead performs DNS resolutions to determine the real backend SharePoint server IP for discovered hostnames. The SteelHead uses this IP address for the next connection going forward, which improves optimization performance.
Single client IPs connecting to multiple SharePoint servers at the same time are not supported (for example, rvbdtech.sharepoint.com and rvbd346.sharepoint.com). When this behavior is detected, the client IP and anycast IP pair are blacklisted for a period of time (1 hour) and redirected to a different server. Traffic is still optimized when the blacklist is in place.
This command is enabled by default in RiOS 9.7 and later and should not be disabled under normal circumstances.
Example
amnesiac (config) # service cloud-accel geodns anycast sharepoint enable
Product
SteelHead, SteelHead-v, SteelHead-c
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