- 在线时间
- 8 小时
- 最后登录
- 2013-7-15
- 威望
- 0
- 金钱
- 30
- 贡献
- 0
- 注册时间
- 2013-6-2
- 阅读权限
- 1
- 主题
- 0
- 帖子
- 4
- 分享
- 0
- 精华
- 0
- 积分
- 34
- 相册
- 0
|
本帖最后由 小张 于 2013-6-6 12:47 编辑
能否请爱总帮忙解释一下CPI的这段描述:
The allowed netmask range for IPv6 APNs is from /44 to /62.
Each IPv6 UE is allocated a /64 prefix. IPv6 addresses are allocated as a prefix per primary PDP context or default EPS bearer. Prefixes are no longer reserved for network or broadcast purposes. Broadcast functionality in IPv6 is implemented as multicast in an own address space.
The number of allowed primary PDP contexts or default EPS bearers for each specified IPv6 address range can be calculated the following way:
number of available IPv6 address prefixes = 2^(64-x)
x the configured prefix size
For example, in the case of GGSN APNs, /50 gives support for 16384 primary PDP contexts. Likewise, in the case of PGW APNs, /50 gives support for 16384 default EPS bearers.
===============================================================================================================
按照这个帖子的描述,我理解如果是/50的的prefix, 那么将会有2^14个IPV6 prefixs,而每个prefix的interface id 是64位的,即2^64个。
那么如果是/50的配置,那么会有2^78个主机地址,即可以给2^78个PDP或default bearer分配。为什么CPI里说是16384(2^14)个呢?
还是没能彻底理解IPv6在PGW上面的分配机制,请爱总帮助解惑。谢谢。 |
|