design proposalhelp wanted
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描述
Description:
Envoy can route traffic to clusters based on external given input, e.g. cluster_header in http_conn_manager, and there will be similar proposal for TCP in #4444. We should disallow traffic from listeners going to certain clusters, e.g. xDS API cluster (especially SDS), ratelimit cluster, ext_authz cluster etc.
cc @rshriram
Relevant Links: https://github.com/envoyproxy/envoy/pull/4444#discussion_r218427696