66 lines
2.7 KiB
Markdown
66 lines
2.7 KiB
Markdown
---
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title: Weave Net Router Sleeve Encapsulation
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menu_order: 15
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search_type: Documentation
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---
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When the Weave Net router forwards packets to peers in `sleeve` mode
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(rather than via the [fast data path](/site/tasks/manage/fastdp.md)), the
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encapsulation looks something like this:
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+-----------------------------------+
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| Name of sending peer |
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+-----------------------------------+
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| Frame 1: Name of capturing peer |
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+-----------------------------------+
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| Frame 1: Name of destination peer |
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+-----------------------------------+
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| Frame 1: Captured payload length |
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+-----------------------------------+
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| Frame 1: Captured payload |
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+-----------------------------------+
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| Frame 2: Name of capturing peer |
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+-----------------------------------+
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| Frame 2: Name of destination peer |
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+-----------------------------------+
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| Frame 2: Captured payload length |
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+-----------------------------------+
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| Frame 2: Captured payload |
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+-----------------------------------+
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| ... |
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+-----------------------------------+
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| Frame N: Name of capturing peer |
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+-----------------------------------+
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| Frame N: Name of destination peer |
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+-----------------------------------+
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| Frame N: Captured payload length |
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+-----------------------------------+
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| Frame N: Captured payload |
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+-----------------------------------+
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The name of the sending peer enables the receiving peer to identify
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the sender of the UDP packet. This is followed by the meta data and
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a payload for one or more captured frames. The router will perform batching
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if it captures several frames very quickly which all need forwarding to
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the same peer. And in this instance, it will fit as many frames as possible into a single
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UDP packet.
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The meta data for each frame contains the names of the capturing and
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the destination peers. Since the name of the capturing peer is
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associated with the source MAC of the captured payload, it allows
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receiving peers to build up their mappings of which client MAC
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addresses are local to which peers.
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The destination peer name enables the receiving peer to identify whether this frame is destined for
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itself or whether it should be forwarded on to some other peer, and
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accommodate multi-hop routing. This works even when the receiving
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intermediate peer has no knowledge of the destination MAC: only the
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original capturing peer needs to determine the destination peer from
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the MAC. In this way Weave peers never need to exchange the MAC addresses
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of clients and need not take any special action for ARP traffic and
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MAC discovery.
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**See Also**
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* [How Weave Net Interprets Network Topology](/site/concepts/network-topology.md)
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