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wido/cloudstack-multicast.sh

Created November 14, 2018 12:35
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Calculate CloudStack VXLAN VNI Multicast Group
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cloudstack-multicast.sh
#!/bin/bash
#
# Calculate the IPv4 Multicast Group that Apache CloudStack will use
# for a VNI
#
# Also see modifyvxlan.sh in CloudStack repository
#
# Author: Wido den Hollander <wido@widodh.nl>
#
VNI=$1
if [ -z "$1" ]; then
echo "Usage: $0 <vni>"
exit 1
fi
GROUP="239.$(( ($VNI >> 16) % 256 )).$(( ($VNI >> 8) % 256 )).$(( $VNI % 256 ))"
echo $GROUP
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