Hi Stephen, It seems that commit c7c1a1ef51aea ("bridge: colorize output and use JSON print library") broke bridge mdb's json output. The json after that commit is invalid, more below.
Setup: 2 bridges - virbr0 and br-test non-json bridge mdb show: 3: virbr0 vnet3 239.10.10.50 temp 3: virbr0 vnet3 225.1.2.3 temp 14: br-test v1 224.224.224.224 permanent json bridge -d -p -j mdb show before c7c1a1ef51aea: { "mdb": [ { "dev": "virbr0", "port": "vnet3", "grp": "239.10.10.50", "state": "temp" },{ "dev": "virbr0", "port": "vnet3", "grp": "225.1.2.3", "state": "temp" },{ "dev": "br-test", "port": "v1", "grp": "224.224.224.224", "state": "permanent" } ], "router": { "virbr0": [ { "port": "vnet3" } ], "br-test": [ { "port": "v1" } ] } } json bridge -d -p -j mdb show after c7c1a1ef51aea: [ "mdb": [ { "index": 3, "dev": "virbr0", "port": "vnet3", "grp": "239.10.10.50", "state": "temp", "flags": [ ] },{ "index": 3, "dev": "virbr0", "port": "vnet3", "grp": "225.1.2.3", "state": "temp", "flags": [ ] } ], "router": [ "virbr0": [ { "port": "vnet3" } ] ], "mdb": [ ], "mdb": [ { "index": 14, "dev": "br-test", "port": "v1", "grp": "224.224.224.224", "state": "permanent", "flags": [ ] } ], "router": [ "br-test": [ { "port": "v1" } ] ] ] Obviously this is not a valid object array and even if it was converted, it must not contain duplicate entries. The "mdb" and "router" array entries must be unique and should contain all the single entries inside, also the global context shouldn't be array. Cheers, Nik