3143d86b69
Updates for patchset 2 review comments Changed link depth of main Planning index and added some narrative guidance Added planning/openstack as sibling of planning/kubernetes Related additions to abbrevs.txt Added max-workers substitution to accomodate StarlingX/vendor variants Signed-off-by: Ron Stone <ronald.stone@windriver.com> Change-Id: Ibff9af74ab3f2c00958eff0e33c91465f1dab6b4 Signed-off-by: Stone <ronald.stone@windriver.com>
55 lines
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55 lines
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.. osh1552670597082
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.. _multicast-subnets-for-the-management-network:
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============================================
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Multicast Subnets for the Management Network
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============================================
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A multicast subnet specifies the range of addresses that the system can use for
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multicast messaging on the network. You can use this subnet to prevent
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multicast leaks in multi-region environments. Addresses for the affected
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services are allocated automatically from the subnet.
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The requirements for multicast subnets are as follows:
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.. _multicast-subnets-for-the-management-network-ul-ubf-ytc-b1b:
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- IP multicast addresses must be in the range of 224.0.0.0 through
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239.255.255.255
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For IPv6, the recommended range is ffx5::/16.
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- IP multicast address ranges for a particular region must not conflict or
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overlap with the IP multicast address ranges of other regions.
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- IP multicast address ranges must not conflict or overlap with the
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well-known multicast addresses listed at:
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`https://en.wikipedia.org/wiki/Multicast_address
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<https://en.wikipedia.org/wiki/Multicast_address>`__
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- IP multicast addresses must be unique within the network.
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- The lower 23-bits of the IP multicast address, used to construct the
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multicast MAC address, must be unique within the network.
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- When interfaces of different regions are on the same L2 network / IP
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subnet, a separate multicast subnet is required for each region.
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- The minimum multicast network range is 16 host entries.
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.. note::
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Addresses used within the IP multicast address range apply to services
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using IP multicast, not to hosts.
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.. warning::
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|ToR| switches with snooping enabled on this network segment require a
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|IGMP|/|MLD| querier on that network to prevent nodes from being dropped
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from the multicast group.
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The default setting for the multicast subnet is 239.1.1.0/28. The default for
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IPv6 is ff05::14:1:1:0/124.
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