[swadm,multicast] add multicast inspection subcommand - #366
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This adds a read-only `swadm multicast` subcommand (aliased as `mcast` as well) for inspecting the multicast groups programmed on the switch: - `multicast list [-t <tag>] [-k external|underlay]` renders all groups as a table, filtered by tag, by replication kind, or both. - `multicast get <group-ip>` shows one group's full config. We also add a kind filter matching on the response variant: `external` selects groups with a NAT target and no direct members, while `underlay` selects those in the reserved ff04::/64 subnet that replicate to member ports.
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This adds a read-only
swadm multicastsubcommand (aliased asmcastas well) for inspecting the multicast groups programmed on the switch:multicast list [-t <tag>] [-k external|underlay]renders all groups as a table, filtered by tag, by replication kind, or both.multicast get <group-ip>shows one group's full config.We also add a kind filter matching on the response:
externalselects groups with a NAT target and no direct members, whileunderlayselects those in the reserved ff04::/64 subnet that replicate to member ports.