m3ua讲课用
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ASP-DOWN: The remote M3UA peer at the ASP is unavailable and/or the
related SCTP association is down. Initially all ASPs will be in this
state. An ASP in this state SHOULD NOT be sent any M3UA messages,
with the exception of Heartbeat, ASP Down Ack and Error messages.
ASP远端M3UA对等体不可用或者相关的SCTP偶联没有建立。初始时所有的ASP都处于此状态。一个ASP在这个状态不能发送任何M3UA消息，除了心跳、
ASP DOEN ACK 和ERROR消息。
ASP-INACTIVE: The remote M3UA peer at the ASP is available (and the
related SCTP association is up) but application traffic is stopped.
In this state the ASP SHOULD NOT be sent any DATA or SSNM messages
for the AS for which the ASP is inactive.
ASP-ACTIVE: The remote M3UA peer at the ASP is available and
application traffic is active (for a particular Routing Context or
set of Routing Contexts).
SCTP CDI: The SCTP CDI denotes the local SCTP layer's Communication
Down Indication to the Upper Layer Protocol (M3UA) on an SGP. The
local SCTP layer will send this indication when it detects the loss
of connectivity to the ASP's peer SCTP layer. SCTP CDI is understood
as either a SHUTDOWN_COMPLETE notification or COMMUNICATION_LOST
notification from the SCTP layer.
SCTP RI: The local SCTP layer's Restart indication to the upper layer M3UA_LINK_INACTIVEM3UA_LINK_UNESTABLISHM3UA_LINK_DOWNAsp Inactive/Asp Inactive Ack/ Asp Alt NotifyAsp Active/Asp Active AckM3UA backout successful/Sctp-CDIM3UA_LINK_ACTIVESCTP-RIAsp Down orAsp Down Ackor SCTP-RISCTP-CDISCTPCDIM3UA establish successfulAsp Up orAsp Up Ack protocol (M3UA) on an SG. The local SCTP will send this indication
when it detects a restart from the ASP's peer SCTP layer.
AS-DOWN: The Application Server is unavailable. This state implies
that all related ASPs are in the ASP-DOWN state for this AS.
Initially the AS will be in this state. An Application Server is in
the AS-DOWN state when it is removed from a configuration.
AS-INACTIVE: The Application Server is available but no application
traffic is active (i.e., one or more related ASPs are in the ASP-
INACTIVE state, but none in the ASP-ACTIVE state). The recovery
timer T(r) is not running or has expired.
ASP Up
The ASP Up message is used to indicate to a remote M3UA peer that the
adaptation layer is ready to receive any ASPSM/ASPTM messages for all
Routing Keys that the ASP is configured to serve.
ASP Up Acknowledgement (ASP Up Ack)
The ASP UP Ack message is used to acknowledge an ASP Up message
received from a remote M3UA peer.
SCCP Transport between IPSPs
******** IP ********
* IPSP * * IPSP *
******** ********
+------+ +------+
|SCCP- | |SCCP- |
| User | | User |
+------+ +------+
| SCCP | | SCCP |
+------+ +------+
| M3UA | | M3UA |
+------+ +------+ | SCTP | | SCTP |
+------+ +------+
| IP | | IP |
+------+ +------+
|________________|
M3UA链路集：SGP和ASP之间的多条链路组成一个链路集。一个链路集的所有链路为同一个AS服务。链路集当中链路的状态决定链路集的状态。ASP的链路集有三种状态：DOWN、INACTIVE、ACTIVE。SGP的链路有四种状态：DOWN、INACTIVE、PENDING、ACTIVE。MGW中的M3UA工作为SGP。链路集处于DOWN状态表示链路集中的所有链路处于DOWN或UNESTABLISH状态。链路集处于INACTIVE状态表示链路集中没有一条链路处于ACTIVE状态，但至少有一条链路处于INACTIVE状态。链路集处于ACTIVE状态表示链路集中的链路至少有一条处于ACTIVE状态。链路集处于PENDING状态表示链路中的最后一条处于ACTIVE状态的链路变为非ACTIVE状态，此时SGP的M3UA实体启动一个PENDING定时器，同时缓存收到报文。如果在定时器超时前，链路集中有链路恢复为ACTIVE状态，则链路集恢复为ACTIVE状态，同时将缓存的报文发送出去。如果定时器超时，链路集状态迁移至DOWN、INACTIVE状态（根据链路集中链路的状态）。
M3UA路由：从源实体到目的实体的路径称之为路由。一条路由对应一个链路集，多条路由可以对应到同一个链路集上。源实体和目的实体间可以存在多条路由。路由有两种状态：可达、不可达。在SGP中，路由状态完全依赖于链路集的状态，链路集处于ACTIVE或PENDING状态，路由可达，否则，路由不可达。在ASP中，路由状态依赖于链路集状态和SG到SS7网络的状态。
M3UA链路有四种状态：UNESTABLISH、DOWN、INACTIVE、ACTIVE。链路处于UNESTABLISH状态表示SGP和ASP间尚未建立起SCTP连接。链路处于DOWN状态表示SCTP连接已经建立好，但是还没有完成M3UA draft 07中的ASP UP过程。链路处于INACTIVE状态表示已经完成了ASP UP的过程，但是还没有完成ASP ACTIVE的过程。链路处于ACTIVE状态表示已经完成了ASP ACTIVE的过程，具体的状态迁移过程参照协议M3UA draft 07。
