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# Request: Send Compact Blocks ("sendcmpct")
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This message notifies the peer that this node support Compact Block Relay.
Node should only send this message after protocol version >= 70014.
This message can indicate the High Bandwidth Relaying mode or Low Bandwidth Relaying mode by setting the `Mode` field.
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Upon receipt of this message from the peer, node should announce new block via `cmpctblock` message if `Mode = 1` , or node should announce new block via `inv` or `header` message as defined in BIP-0130.
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## Format
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| Field | Length | Format | Description |
|--|--|--|--|
| Mode | 1 byte | Integer | 1: High Bandwidth Relaying mode;</br> 0: Low Bandwidth Relaying mode;</br> Other: Invalid |
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| Version | 8 bytes | Integer <sup>[(LE) ](/protocol/misc/endian/little )</sup> | Must set to 1, otherwise invalid.|
