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电梯直达

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发表于 2006-04-12 14:50 |只看该作者 |倒序浏览

在组播地址的说明中,对于scop字段的说明中，其中的1 node-local scop 和5 site-local scop 有什么区别？
原文如下：
An IPv6 multicast address is an identifier for a group of nodes. A
node may belong to any number of multicast groups. Multicast
addresses have the following format:
| 8 | 4 | 4 | 112 bits |
+------ -+----+----+---------------------------------------------+
|11111111|flgs|scop| group ID |
+--------+----+----+---------------------------------------------+
11111111 at the start of the address identifies the address as
being a multicast address.
+-+-+-+-+
flgs is a set of 4 flags: |0|0|0|T|
+-+-+-+-+
The high-order 3 flags are reserved, and must be initialized to
0.
T = 0 indicates a permanently-assigned ("well-known") multicast
address, assigned by the global internet numbering authority.
T = 1 indicates a non-permanently-assigned ("transient")
multicast address.
scop is a 4-bit multicast scope value used to limit the scope of
the multicast group. The values are:
0 reserved
1 node-local scope
2 link-local scope
3 (unassigned)
4 (unassigned)
5 site-local scope
6 (unassigned)
7 (unassigned)
8 organization-local scope
9 (unassigned)
A (unassigned)
B (unassigned)
C (unassigned)

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firebird

小富即安

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发表于 2006-04-12 15:08 |只看该作者

Currently, the following regions (scopes) are defined:
· ffx1: node−local, packets never leave the node.
· ffx2: link−local, packets are never forwarded by routers, so they never leave the specified link.
· ffx5: site−local, packets never leave the site.
·ffx8: organization−local, packets never leave the organization (not so easy to implement, must becovered by routing protocol).
· ffxe: global scope.
· others are reserved

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Clark.Ho

白手起家

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3楼 [报告]

发表于 2006-04-12 15:28 |只看该作者

thank you for your answer.
but i want to know what is the site,and what is the node ?
How to distinguish them?

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firebird

小富即安

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4楼 [报告]

发表于 2006-04-12 17:10 |只看该作者

留个EMAIL，我发给你两个文件你看下，我具体也不太清楚。

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wonderliang

荣誉版主

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5楼 [报告]

发表于 2006-04-12 21:27 |只看该作者

我记得不是很清楚了

一个主机响应多个组播地址，就是属于多个组。
node−local是节点请求组播地址，用于代替ARP，别人要找他就发这个组播，可以根据IPV IP知道这个组播地址
link−local是链路组播地址，site−local，organization−local一个比一个传输的范围大。