Cabletron Systems 2H28-08R manual Multicasts Read-Only

RMON Statistics Screen

Multicasts (Read-Only)

The Multicasts field displays the total number of good frames received that were directed to a multicast address. This number does not include frames directed to the broadcast address.

CRC Alignment Errors (Read-Only)

This field displays the number of frames with bad Cyclic Redundancy Checks (CRC) received from the network. The CRC is a 4-byte field in the data frame that ensures that the data received is the same as the data that was originally sent.

Undersized Pkts (Read-Only)

The Undersized Pkts field displays the number of frames received whose size was less than the minimum Ethernet frame size of 64 bytes, not including preamble, but have a valid CRC.

Oversized Pkts (Read-Only)

The Oversized Pkts field displays the number of frames received whose size exceeded 1518 data bytes, not including preamble, but have a valid CRC.

Fragments (Read-Only)

This field displays the number of received frames that are not the minimum number of bytes in length or received frames that had a bad Frame Check Sequence (FCS), were less than 64 bytes in length (excluding framing bits, but including FCS bytes), and have an invalid CRC.

NOTE

It is normal for the Fragments field to increment. This is because the RMON agent increments the field when runts (undersized frames) are detected (which are normal occurrences due to collisions) and when noise hits occur.

Jabbers (Read-Only)

This field displays the total number of frames that were greater than 1518 bytes and had either a bad FCS or a bad CRC.

Total Packets (Read-Only)

This field displays the total number of frames (including bad frames, broadcast frames, and multicast frames) received on this interface.

2H28-08R SmartSwitch 2208 User’s Guide 5-69