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<a id="dir-spec.txt-3.4"></a>
# Exchanging votes
Authorities divide time into Intervals. Authority administrators SHOULD
try to all pick the same interval length, and SHOULD pick intervals that
are commonly used divisions of time (e.g., 5 minutes, 15 minutes, 30
minutes, 60 minutes, 90 minutes). Voting intervals SHOULD be chosen to
divide evenly into a 24-hour day.
Authorities SHOULD act according to interval and delays in the
latest consensus. Lacking a latest consensus, they SHOULD default to a
30-minute Interval, a 5 minute VotingDelay, and a 5 minute DistDelay.
Authorities MUST take pains to ensure that their clocks remain accurate
within a few seconds. (Running NTP is usually sufficient.)
The first voting period of each day begins at 00:00 (midnight) UTC. If
the last period of the day would be truncated by one-half or more, it is
merged with the second-to-last period.
An authority SHOULD publish its vote immediately at the start of each voting
period (minus VoteSeconds+DistSeconds). It does this by making it
available at
`http://<hostname>/tor/status-vote/next/authority.z`
and sending it in an HTTP POST request to each other authority at the URL
`http://<hostname>/tor/post/vote`
If, at the start of the voting period, minus DistSeconds, an authority
does not have a current statement from another authority, the first
authority downloads the other's statement.
Once an authority has a vote from another authority, it makes it available
at
`http://<hostname>/tor/status-vote/next/<fp>.z`
where `<fp>` is the fingerprint of the other authority's identity key.
And at
`http://<hostname>/tor/status-vote/next/d/<d>.z`
where `<d>` is the digest of the vote document.
Also, once an authority receives a vote from another authority, it
examines it for new descriptors and fetches them from that authority.
This may be the only way for an authority to hear about relays that didn't
publish their descriptor to all authorities, and, while it's too late
for the authority to include relays in its current vote, it can include
them in its next vote. See section 3.6 below for details.
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