Cisco ASR 5000 Series, Обзор продукта

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ASN Gateway Overview
ASN Call Procedure Flows ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Step Description
2 SS Basic capability exchange (SBC-REQ) between MS and BS starts and MS-Info-Request for authorization policy sent to
AAA client/authenticator in ASN Gateway.
3 AAA client/authenticator (ASN Gateway) sends MS-Info-Report to BS and BS sends SS Basic Capability Response (SBC-
RSP) to MS.
4 BS acknowledges the MS-Info-Report to AAA client/authenticator.
5 AAA client/authenticator (ASN Gateway) starts EAP transfer request to BS and MS.
6 MS and BS sends EAP transfer response to AAA client/authenticator.
7 The MS progresses to an authentication phase with home AAA Server. Authentication is based on PKMv2 as defined in the
IEEE standard 802.16 specification. EAP authentication process starts
8 EAP authentication successful and AAA client/authenticator starts security context transfer.
9 PKMv.2-RSP/EAP-Transfer/SA-TEK-Challenge-Request-Response/Key-Request-Response exchange between MS and
BS.
10 MS sends 802.16 Registration Request (REG-REQ) to ASN BS and ASN BS sends MS-Info-Request to AAA
client/authenticator.
11 AAA client/authenticator sends MS-Info-Report to BS and BS sends Registration Response (REG-RESP) to MS and MS-
Info-Report Acknowledge to AAA client/authenticator.
12 ASN Gateway sends Path Registration Request to ASN BS.
13 ASN BS creates 802.16e connection and establishes path with MS.
14 ASN BS sends Path Registration Response to ASN Gateway and ASN Gateway creates service flow with CSN over which
PDUs can be sent and received.
15 ASN Gateway sends Path Registration Acknowledgment to ASN BS.
16 GRE tunnel mapped to 802.16 connection between MS and ASN BS.
17 R6 GRE data path established between ASN BS and ASN Gateway and data flow starts.
Unexpected Network Re-entry
An unexpected network re-entry is when a mobile station starts the process of initial network entry to the ASN Gateway
via the same or new base station while an existing call for the MS is still in progress or being set up. When this occurs,
the ASN Gateway‘s default behavior is to:
Accept the new call regardless of the existing call state if the pre-attachment request of the new call comes from
a different BS.
Accept the new call if the original call is in any state past the pre-attachment phase and the pre-attachment
request of the new call comes from the same BS.
Drop the original call in favor of new call.