In addition to CORE_PEER_GOSSIP_EXTERNALENDPOINT for exposing the peer endpoints to other orgs, make sure you understand how anchor peers are configured to bootstap the cross-org communication:
https://hyperledger-fabric.readthedocs.io/en/release-1.4/gossip.html#anchor-peers
https://hyperledger-fabric.readthedocs.io/en/release-1.4/build_network.html#create-a-channel-configuration-transaction
https://hyperledger-fabric.readthedocs.io/en/release-1.4/build_network.html#update-the-anchor-peers

That being said, cross-org configuration is not strictly needed for block sync... Blocks should be synched correctly from org leader to org followers without the cross-org communication configured. Or like I said, you may want to force each peer to get blocks from orderer:
CORE_PEER_GOSSIP_USELEADERELECTION = false
CORE_PEER_GOSSIP_ORGLEADER = true

The cross-org communication becomes necessary if you are using private data or service discovery. Good luck!


Dave Enyeart

"Joao Antunes" ---11/07/2019 11:57:46 AM---Hi Dave, You are right and thank you for sending the lines of the default behaviour.

From: "Joao Antunes" <joao.antunes@...>
To: fabric@...
Date: 11/07/2019 11:57 AM
Subject: [EXTERNAL] Re: [Hyperledger Fabric] Peers with different heights #fabric #database #consensus
Sent by: fabric@...

After some investigations, I think I'm missing CORE_PEER_GOSSIP_EXTERNALENDPOINT.

I have CORE_PEER_GOSSIP_BOOTSTRAP configured on both peer2 from org2 and org1 and they both communicate with peer1-org2 and peer1-org1 respectively. But there is no gossip between orgs. Currently checking the effect of both variables in this setup.