Quality Of Service Profile Selection; Ggsn Selection; Ggsn Failover Case - Cisco ASR 5000 Administration Manual

Enhanced wireless access gateway

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Enhanced Wireless Access Gateway Overview

Quality of Service Profile Selection

If the "3GPP-GPRS-Negotiated-QoS-Profile" AVP is not supplied in Accounting-Start Request message, a default

Quality of Service (QoS) profile is used. This value is hardcoded to maximum values in the QoS profile as defined in TS

24.008.

In this release, eWAG assumes the presence of Operator Identifier (OI) in "mncXXX.mccYYY.gprs" format in APN

received in the "Called-Station-ID" AVP. However, no validation of the presence of OI is made. The "Called-Station-

Id" AVP content is sent to DNS for GGSN IP address resolution without any modification. The same is applicable if the

"Called-Station-Id" AVP is not present and the default APN configuration in the eWAG service is used. Note that in

both these cases only the Network Identifier (NI) part has to be configured as APN at eWAG.

Important:

for lab / testing purposes.

In case the DNS server returns more than one GGSN address for the given APN, and if Create PDP Context Request to

GGSN fails due to the GGSN being unreachable, then the next GGSN address from the list of addresses will be tried.

The next GGSN address will also be tried in case the GGSN rejects Create PDP Context Request due to any of the

following reasons:

 No resources available

 All dynamic PDP addresses are occupied

 No memory available

 Missing or unknown APN

 System failure

 Unknown PDP address or PDP type

 All decode errors at peer, such as "Mandatory IE incorrect", "Mandatory IE missing", "Optional IE incorrect",

and "Invalid message format"

The next GGSN will be tried until either the address list is exhausted or PDP context activation succeeds. Note that the

eWAG is concerned with only the first five reasons from the above list to retry the next GGSN.

The maximum limit for the number of GGSN addresses that can be retried is 31.

OL-28188-02

In this release, GGSN Failover Support is not fully qualified and is not supported, it is available only

Cisco ASR 5000 Enhanced Wireless Access Gateway Administration Guide ▄

Feature Description ▀

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