hub Address Chunk

1.3.6.1.4.1.11.2.14.2.6.2

The hubAddressChunk object returns an opaque chunk of the address table. Each chunk can be interpreted as an array of records in the form: mac address [6 bytes], port number [2 bytes], inactivity time [4 bytes] On a Get, the returned chunk can include empty (unused) entries. Instances are chunk numbers, which start at 1 and go to 52. Each chunk can hold 34 addresses. A returned chunk might look like: Address Port Inactivity Time 080009001234 1 0 080009002345 2 10000 080009003456 1 20000 000000000000 1 0 080009009876 EMPTY 0 080009004567 EMPTY 15000 . . . 080009005678 EOL 959000 A value of EMPTY in the Port field indicates an unused (i.e. aged out) entry in the table. When the EOL (End Of List) bit is set in the Port field, that entry is the last entry in the table. It is possible for EOL to be seen in any entry. EOL (0x4000) and EMPTY (0x8000) are bit masks which are ORed with the port number in the port field of the entry. It is possible for both the EOL and EMPTY bits to be set in the same entry. The remainder of the chunk after the EOL entry will be zeroed. The inactivityTime and Address fields are meaningless if the EMPTY bit is set in the Port field. In this case, inactivityTime and Address are not guaranteed to be zeroed. The Manager may start with any chunk it likes and request the chunks in any order. It may perform multiple requests for the same chunk. The agent does not save state from previous requests. A request of chunk #1 would return the contents of the first 34 address table entries, whether they are all full, all empty, or some full and the rest empty. A request of chunk #2 will return entries #35 through #68. And so on. The address table can change between Get requests. An address' location can change, or an address could age out and then be added back in at a different location in the table. Thus, the Manager could see the address twice in the table.