Avaya Configuring IP Utilities Instrukcja Użytkownika Strona 69

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Customizing NTP Services
114071 Rev. A 6-5
Deleting Time Servers from a Router
When you delete a time server (peer), NTP deletes from the peer list the IP
address of that time server.
Configuring NTP Access Control
The access control feature allows you to selectively restrict NTP clients from
receiving NTP time stamps from specific time servers on the network by filtering
these time stamps. The filter is based on the source IP address or an IP subnet
address. This is similar to an inbound filter that drops NTP packets based on
source IP address and IP subnet mask.
Adding Access Control to a Time Server
To restrict an NTP server from receiving time stamps from specific time servers,
you must specify the time server’s IP address. NTP adds the IP address of the time
server to an access control list, which the NTP client uses when querying time
servers for time information. You use access control in Broadcast Client and
Multicast Client mode.
Specifying a Filter Type
By default, the filter type is set to Restrict, which tells NTP to drop specific NTP
time stamps destined for an NTP client based on its source IP address and source
subnet mask. For example, if you have ten time servers broadcasting to a router
and you want to receive NTP time stamps from only three time servers, you can
restrict the other seven time servers.
When you set the Filter Type to Prefer, NTP disables filtering on a specific time
server’s IP address or a range of time server’s IP addresses.
Site Manager: Access IP Address parameter: page A-16
Site Manager: Filter Type parameter: page A-17
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