In response to your message, I thought it might be helpful to summarize the status of SNMP variable support for the various adapter technologies used in the RS/6000 based routers. The RS960 T3 (HSSI) adapter uses HDLC framing point-to-point. The destination MAC address on these links always begins with 0xFF03: 0xFF says that this is a "broadcast" packet, which means that I either want it to go to whomever is at the far end, or that I am taking advantage of the multidrop features in HDLC and I want everyone to get this (BTW, 03 says that this is a data packet). Strict interpretation of MIB-II directs that if the MAC address was broadcast, then the packet should be counted as non-unicast. And this is reflected in the IBM SNMP support for these adapters. For T960 cards, however, we count Unicast packets, since we are addressing a single station (they do not use HDLC framing). The following matrix provides a summary of SNMP support for each of the adapter types used in the RS/6000 based routers: inU outU inNU outNU inOct outOct InErr OutErr ==================================================================== T960 T1 | IN OUT 0 0 0 0 IN+OUT 0 | T960 Ethernet | U+B U+B 0 0 0 0 IN+OUT 0 | RS960 (all) | 0 0 IN OUT OK OK OK OK | ==================================================================== I do not have the matrix information for the current FDDI "Hawthorne" technolgy cards. But, they will soon be replaced by RS960 based FDDI cards for which the subagent will behave just as that of the RS960 T3 cards. -------------------- Returning to the specifics of Jian Li's report, the questioned MIB-II Interface counters are listed as follows: Ethernet: ifIndex = 3 ifInOctets = 0, ifOutOctet = 0 ifInUcastPkts = 816175323, ifOutUcastPkts = 964648059 ifInNUcastPkts = 0, ifOutNUcastPkts = 0 Comment: This interface must be a T960 card, which does not collect ifInOctets and ifOutOctets. The InUcastPkts and InNUcastPkts are collected in the counter ifInUcastPkts. The OutUcastPkts and OutNUcastPkts are collected in the counter ifOutUcastPkts. T3: ifIndex = 4 ifInOctets = 1532701256, ifOutOctets = 2614141685 ifInUcastPkts = 0, ifOutUcastPkts = 0 ifInNUcastPkts = 1033010978, ifOutNUcastPkts = 897328785 Comment: The packets are counted as NUcastPkts. -Ittai