Cisco Cisco ASR 5700
APN Profile Configuration Mode
▀ dns-extn
▄ Command Line Interface Reference, StarOS Release 17
1496
Usage
With this command, the APN in the DNS query string, used for querying the GGSN address, can be
appended with additional information, such as
appended with additional information, such as
digits from the MSISDN
LAC/RAC info
RNC-ID
profile index from the charging characteristics information (SCHAR)
This additional information allows some customization of the DNS query string to facilitate selecting a
specific (usually local or nearest) GGSN.
For example, roaming subscribers using a specific APN may want to be directed to a specific GGSN. This
can be achieved by having an operator policy for roaming subscribers associated with an APN profile that
includes a configuration specifying certain digits, from the MSISDN or geographical information from the
LAC/RAC, be appended to the APN. This is then used as the DNS query string.
In addition, the operator must configure appropriate DNS entries to enforce the selection of the required
GGSN. After appending the MSISDN digits to the DNS query string, the string will have the form:
specific (usually local or nearest) GGSN.
For example, roaming subscribers using a specific APN may want to be directed to a specific GGSN. This
can be achieved by having an operator policy for roaming subscribers associated with an APN profile that
includes a configuration specifying certain digits, from the MSISDN or geographical information from the
LAC/RAC, be appended to the APN. This is then used as the DNS query string.
In addition, the operator must configure appropriate DNS entries to enforce the selection of the required
GGSN. After appending the MSISDN digits to the DNS query string, the string will have the form:
ni.<digits>.mnc*.mcc*.gprs
After appending the LAC/RAC information to the DNS query string, the string will have the form:
<apn_network_id>.racAAAA.lacBBBB.<apn_operator_id>
where the AAAA and BBBB are Hex-coded digits (less than 4 significant digits and one or more zero (“0”)
digits will be inserted to the left side of the Hex to fill the 4-digit coding).
After appending the charging characteristic (SCHAR) information, the DNS string will take the following
form:
digits will be inserted to the left side of the Hex to fill the 4-digit coding).
After appending the charging characteristic (SCHAR) information, the DNS string will take the following
form:
<apn_network_id>.<profile_index>.<apn_operator_id>
The profile index in the following example has an integer value 10:
quicknet.com.uk.1010.mnc234.mcc027.gprs
If the RNC-ID information is configured to be a part of the APN name, and if inclusion of the profile index of
the charging characteristics information is also enabled before the DNS query is sent, the profile index is
included after the included RNC-ID and the DNS APN name will appear in the following form:
the charging characteristics information is also enabled before the DNS query is sent, the profile index is
included after the included RNC-ID and the DNS APN name will appear in the following form:
<apn_network_id>.<rnc_id>.<profile_index>.<apn_operator_id>
Once the DNS extension is defined, the selected extension is applicable when either the wildcard APN
feature or the default APN feature are configured and used.
The information is appended to the DNS query and the actual APN string sent to the GGSN will not be
modified in any way.
feature or the default APN feature are configured and used.
The information is appended to the DNS query and the actual APN string sent to the GGSN will not be
modified in any way.
Example
A sample MSISDN is ‘112233445566778’ and a sample APN NI (network identifier) is ‘wap98.testnetz.ca’.
The following command instructs the SGSN to create a new APN with digits pulled from the MSISDN and
appended to the APN:
The following command instructs the SGSN to create a new APN with digits pulled from the MSISDN and
appended to the APN:
msisdn start-offset 3 end-offset 9
The resulting APN DNS query string would have appended 7 digits (2233445)to the APN NI so that it would
appear something like
appear something like
wap98.testnetz.ca.2233445.MNC009.MCC262.GPRS
Enable inclusion of geographical information in the APN string used for the DNS query to locate the closest
GGSN:
GGSN:
lac-rac
In the following example, the DNS query for a subscriber using RNC 0321 with the profile index of value 8
would appear as:
would appear as:
quicknet.com.uk.0321.1000.mnc234.mcc027.gprs