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[devsite] add clarifications to multicast addressing primer (#5160)

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This commit is contained in:
Jonathan Hui
2020-06-30 08:48:08 -07:00
committed by GitHub
parent 6930dd3603
commit 284cd96886
2 changed files with 9 additions and 6 deletions
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doc/site/en/guides/thread-primer/ipv6-addressing.md
+6 -4
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@@ -226,10 +226,12 @@ Key Point: A major difference between FTDs and MTDs are that FTDs subscribe to
the `ff03::2` multicast address. MTDs do not. the `ff03::2` multicast address. MTDs do not.
You might notice that Sleepy End Devices (SEDs) are not included as a You might notice that Sleepy End Devices (SEDs) are not included as a
recipient in the multicast table above. There is an additional unicast recipient in the multicast table above. Instead, Thread defines
prefix-based multicast address used for All Thread Nodes, including SEDs. This link-local and realm-local scope unicast prefix-based IPv6 multicast
multicast address varies by Thread network, because it is built on the address used for All Thread Nodes, including SEDs. These multicast
unicast Mesh-Local prefix. addresses vary by Thread network, because it is built on the unicast
Mesh-Local prefix (see [RFC 3306](https://tools.ietf.org/html/rfc3306)
for more details on unicast-prefix-based IPv6 multicast addresses).
Arbitrary scopes beyond those already listed are also supported for Thread Arbitrary scopes beyond those already listed are also supported for Thread
devices. devices.
doc/site/en/guides/thread-primer/node-roles-and-types.md
+3 -2
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@@ -50,8 +50,9 @@ An FTD can operate as a Router (Parent) or an End Device (Child).
### Minimal Thread Device ### Minimal Thread Device
A Minimal Thread Device does not subscribe to multicast traffic and forwards all A Minimal Thread Device does not subscribe to the all-routers
messages to its Parent. There are two types of MTDs: multicast address and forwards all messages to its Parent. There are
two types of MTDs:
* Minimal End Device (MED) — transceiver always on, does not need to poll for * Minimal End Device (MED) — transceiver always on, does not need to poll for
messages from its parent messages from its parent