ER_CIDRS=$(join_by , $(echo &#34;${ALL_CLUSTER_CIDRS}&#34;))
$ ALL_CLUSTER_NETTAGS=$(gcloud --project $PROJECT_ID compute instances list --format=&#39;value(tags.items.[0])&#39; | sort | uniq)
$ ALL_CLUSTER_NETTAGS=$(join_by , $(echo &#34;${ALL_CLUSTER_NETTAGS}&#34;))
</code></pre></li><li><p>创建防火墙规则。</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ gcloud compute firewall-rules create istio-multicluster-pods \
    --allow=tcp,udp,icmp,esp,ah,sctp \
    --direction=I