8371 Interface Configuration

Using the 10/100-Mbps Ethernet Network Interface

This chapter describes how to use the 10/100-Mbps Ethernet interface. It includes the following section:

"Displaying 10/100-Mbps Ethernet Statistics"
"Auto-negotiation on the 10/100-Mbps Ethernet Interface"

Displaying 10/100-Mbps Ethernet Statistics

You can use the interface command from the GWCON environment to display the following statistics.

+interface
                                            Self-Test  Self-Test Maintenance
Net   Net'   Interface   Slot-Port              Passed     Failed      Failed
0     0      Eth/0       Slot: 0   Port: 1           0          0           0
1     1      Eth/1       Slot: 0   Port: 2           0          0           0
2     2      Eth/2       Slot: 0   Port: 3           0          0           0
3     3      Eth/3       Slot: 0   Port: 4           0          0           0
4     4      Eth/4       Slot: 0   Port: 5           0          0           0
5     5      Eth/5       Slot: 0   Port: 6           0          0           0
6     6      Eth/6       Slot: 0   Port: 7           0          0           0
7     7      Eth/7       Slot: 0   Port: 8           0          0           0
8     8      Eth/8       Slot: 0   Port: 9           0          0           0
9     9      Eth/9       Slot: 0   Port: 10          0          0           0
10    10     Eth/10      Slot: 0   Port: 11          0          0           0
11    11     Eth/11      Slot: 0   Port: 12          0          0           0
12    12     Eth/12      Slot: 0   Port: 13          0          0           0
13    13     Eth/13      Slot: 0   Port: 14          0          0           0
14    14     Eth/14      Slot: 0   Port: 15          0          0           0
15    15     Eth/15      Slot: 0   Port: 16          0          0           0
16    16     Eth/16      Slot: 1   Port: 1           0          0           0
17    17     Eth/17      Slot: 1   Port: 2           0          0           0
18    18     Eth/18      Slot: 1   Port: 3           0          0           0
19    19     Eth/19      Slot: 1   Port: 4           0          0           0
20    20     Eth/20      Slot: 1   Port: 5           0          0           0
21    21     Eth/21      Slot: 1   Port: 6           0          0           0
22    22     Eth/22      Slot: 1   Port: 7           0          0           0
23    23     Eth/23      Slot: 1   Port: 8           0          0           0
24    24     Eth/24      Slot: 2   Port: 1           0          0           0
25    25     Eth/25      Slot: 2   Port: 2           0          0           0
26    26     Eth/26      Slot: 2   Port: 3           0          0           0
27    27     Eth/27      Slot: 2   Port: 4           0          0           0
28    28     Eth/28      Slot: 2   Port: 5           0          0           0
29    29     Eth/29      Slot: 2   Port: 6           0          0           0
30    30     Eth/30      Slot: 2   Port: 7           0          0           0
31    31     Eth/31      Slot: 2   Port: 8           0          0           0
32    32     Eth/32      Slot: 3   Port: 1           0          0           0
33    33     Eth/33      Slot: 3   Port: 2           0          0           0
34    34     Eth/34      Slot: 3   Port: 3           0          0           0
35    35     Eth/35      Slot: 3   Port: 4           0          0           0
36    36     ATM/0       Slot: 1   Port: 4           0          1           0
37    37     ATM/1       Slot: 1   Port: 2           0          1           0
38    38     ATM/2       Slot: 2   Port: 1           0          1           0
39    39     ATM/3       Slot: 2   Port: 2           0          1           0
40    40     Eth/36                                  0          0           0
41    41     Eth/37                                  0          0           0
42    42     Eth/38                                  0          0           0
43    43     Eth/39                                  0          0           0
44    44     Eth/40                                  0          0           0
45    55     Eth/42                                  0          0           0
46    56     Eth/43                                  0          0           0
47    57     Eth/44                                  0          0           0
48    58     Eth/45                                  0          0           0
49    59     Eth/46                                  0          0           0
50    50     Eth/47                                  0          0           0
51    51     Eth/48                                  0          0           0
52    52     Eth/49                                  0          0           0
53    53     Eth/50                                  0          0           0
54    54     Eth/51                                  0          0           0
55    65     Eth/52                                  0          0           0
56    66     Eth/53                                  0          0           0
57    67     Eth/54                                  0          0           0
58    68     Eth/55                                  0          0           0
59    69     Eth/56                                  0          0           0
60    60     Eth/57                                  0          0           0
61    61     Eth/58                                  0          0           0
62    62     Eth/59                                  0          0           0
63    63     Eth/60                                  0          0           0
+

These statistics have the following meaning:

Nt

Global network number.

Nt'

This field is for the serial interface card. Disregard the output.

Interface

Interface name and its instance number.

Self-Test: Passed

Number of self-tests that succeeded.

Self-Test: Failed

Number of self-tests that failed.

Maintenance: Failed

Number of maintenance failures.

Physical address

The Ethernet address of the device currently in use. This may be the PROM address or an address overwritten by some other protocol.

PROM address

The permanent unique Ethernet address in the PROM for this Ethernet interface.

Actual address

Configured duplex

The value configured for duplex. Values can be Half Duplex, Full Duplex, or Auto-Negotiation.

Actual duplex

The value at which the adapter is presently operating. It might be different from the value configured, depending on the switch capability. If the adapter is not Up, the value displayed will be Unknown. Otherwise the value can be Half Duplex or Full Duplex.

Whenever the link partner (switch or hub) does not participate during the negotiation phase, *** will follow the actual duplex mode value. When *** is indicated the operational duplex value should be verified on the switch or hub for consistency.

Most hubs (unlike switches) can only support half-duplex mode, and are not capable of negotiation. As such the *** indication will usually be displayed when the interface is connected to a hub.

A message will also be logged via the ELS system whenever a possibility of a mis-match in duplex mode exists.
Note: If the link partner (switch or hub) to which the interface is connected does not respond during the negotiation phase, the two may result in operating in different duplex modes. That is, the interface may be operating in half-duplex, while the switch port is operating in full duplex mode. A mismatch in the duplex mode can result in severe performance degradation. See "10/100-Mbps Ethernet Configuration Commands" for important information regards speed and duplex configurations.

Configured speed

The value configured for speed. Values can be 10 Mbps, 100Mbps, or Auto-Negotiation.

Actual speed

The speed at which the adapter is presently operating.If the adapter is not Up, the value displayed will be Unknown. Otherwise the value can be 10 Mbps or 100 Mbps.

Input statistics:

failed, packet too long or failed, frame too long

The Failed, Packet Too Long counter increments when the interface receives a packet that is larger than the maximum size of 1518 bytes for an Ethernet frame. This data is exported via SNMP as the dot3StatsFrameTooLongs counter.

failed, CRC error or failed, FCS (Frame Check Sequence) error

The Failed, CRC (Cyclic Redundancy Check) Error counter increments when the interface receives a packet with a CRC error. This data is exported via SNMP as the dd3StatsFCSErrors counter.

failed, alignment error

The Failed, Framing Error counter increments when the interface receives a packet where the length in bits is not a multiple of eight.

failed, receive overflow

Overflow error indicates that the receiver has lost all or part of the incoming frame, due to an inability to move data from the receive FIFO into memory buffer before the internal FIFO overflowed.

receive underrun

Indicates the number of times the adapter did not have a second buffer to store a long frame (requiring more than one buffer).

Output statistics:

one retry

Indicates that exactly one retry was needed to transmit a frame. This data is exported via SNMP as the dot3StatsDeferredTransmissions counter.

single collision

The Single Collision counter increments when a packet has a collision on the first transmission attempt, and then successfully sends the packet on the second transmission attempt. This data is exported via SNMP as the dot3StatsSingleCollisionFrames counter.

multiple collisions

The Multiple Collisions counter increments when a packet has multiple collisions before being successfully transmitted. This data is exported via SNMP as the dot3MultipleCollisionFrames counter.

failed, transmit underflow

Transmit underrun indicates that transmitter has truncated a message because it could not read data from the memory fast enough. It also indicates that the FIFO on the adapter has emptied out before the end of the frame was reached. IFO into memory buffer before the internal FIFO overflowed.

failed, excess collisions

The Failed, Excess Collisions counter increments when a packet transmission fails due to 16 successive collisions. This error indicates a high volume of network traffic or hardware problems with the network. This data is exported via SNMP as the dot3StatsExcessiveCollisions counter.

memory error

Memory errors occur when the adapter is not given access to the system interface bus within the programmable length of time. This error will normally occur during transmit operations, indicating transmit underrun.

Auto-negotiation on the 10/100-Mbps Ethernet Interface

Specifying values other than auto for speed or duplex on the 10/100 Ethernet interface or its link partner (switch port) can result in duplex mode mismatch or link activation failures.

Link activation failures due to configuration mismatches will occur on the IBM 8371 whenever the speed configured at both ends are not identical.

When either speed or duplex value is auto-negotiate, both speed and duplex will be negotiated with the link partner and its configured speed or duplex will be used.

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