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Multi-Channel

PreviousGovernanceNextKNI

Last updated 2 years ago

A Klaytn node can be run with Multi-channel.

If a node is executed with multi-channel configuration, 2 ports are set up for communication. On the otherhand, if a node is executed with single channel configuration, 1 port is set up. If 2 multi-channel nodes are trying to connect, a connection is established using 2 ports. Otherwise, they will use 1 port for communication.

A multi-channel node can be enabled through the flag --multichannel. If you use , multi-channel is enabled by default due to the statement MULTICHANNEL=1 in . To disable multi-channel, please replace the statement with MULTICHANNEL=0. If you want to run a node with specific ports, flags port and subport can be used. If you want to specify ports values of a connecting peer, check out .

Architecture

The picture above shows a connection between two multi-channel nodes. Two ports, mainport (A) and subport (B), transfer different messages.

  • Mainport(A) is used to transfer messages related to blocks and consensus protocols.

    • Block messages include requests and responses of the hash, header, body and receipt of a block.

  • Subport(B) is for transferring transaction messages.

The picture shows a connection between two single channel nodes or between a single channel node and a multi-channel node. In this case, all messages related to blocks, transactions, and consensus protocols are transported via the same port.

Ports

  • Single Channel : A single channel node uses one port (default is 32323).

  • Multi-Channel: A multi-channel node uses two ports. The ports can be specified in port and subport. In Klaytn, the default values of port and subport are 32323 and 32324, respectively.

    • You might not set subport when connecting to multi-channel node. In this case, at first, a Klaytn node tries to connect using a single-channel. In handshake process, the actual peer's port numbers are revealed. If the peer is a multi-channel node, the ongoing connection will be canceled and a reconnection will be made with the updated ports.

Consensus messages include Request, Preprepare, Prepare, Commit and RoundChange. The meaning of the messages can be found in .

To set port numbers in KNI, please refer to .

the KNI scheme
kend
kend.conf
KNI
PBFT
Multi-Channel Server
Single Channel Server