[多选题]SGSN对接GGSN,发送create pdp上下文,GGSN没响应可能的原因是()。
When the SGSN interconnects with the GGSN, after the SGSN sends a "create pdp context" message, if the GGSN does not make any response, what are the possible reasons? ( ) A.SGSN网管没设置GN vrfid,导致消息没发送出去
Gn vrfid is not configured on the SGSN OMM, so the message can not be sent out. B.GN口路由不通,GGSN收不到消息
The route on the Gn interface fails, so the GGSN can not receive the message. C.GGSN系统内部处理错误丢弃响应消息
The GGSN system discards the response message due to an internal processing error. D.GGSN的GPTC地址被地址池引用
The GTPC address of the GGSN is used in the IP pool. E. F.1234