Maximum Time difference between DHCP primary and DHCP failover Server
tmark at isc.org
Tue Jan 19 13:03:52 UTC 2021
This is going to vary largely on site dynamics. The primary challenge to
failover performance, is that it is a synchronous protocol. Servers are
supposed to wait until their peers acknowledge that a least update has
been received prior to sending the corresponding response (i.e. DHCPACK)
to the client.
In other words, this adds the round trip latency to the response time
for a given client's DHCPREQUEST. If DHCPREQUESTs are coming in too
fast, the server will fall behind and clients will stop getting
responses. If you need as sustained 10 DORAs a second, then 250ms
round-trip latency between the peers is going to be a deal breaker.
I'm sure others on this list will have plenty to share on the subject.
On 1/19/21 6:38 AM, kraishak wrote:
> Hi Thomas,
> Thanks for sharing information, Can you also please comment or share your
> experience if you have any, about what could be the maximum network latency
> between the primary and failover DHCP servers that does not impact the
> server performance
> Thanks in advance
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