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FAQ-What's the Meaning of Statistics on Packets at Ethernet Port of NE40NE80

Publication Date:  2012-07-27 Views:  44 Downloads:  0
Issue Description
Q:What's the meaning of statistics on packets at Ethernet port of NE40NE80?
Alarm Information
Null
Handling Process
Meanings of statistcis in Input: 
1. shorts: packet with correct checksum and with a  length less than 64-byte  
2. jumbos: packet with correct checksum and with a length less than 1519-9018 
3. giants: packet with extra length and correct checksum 
4. pauses: packet being delayed 
5. unicasts: unicast packet 
6. multicasts: multicast packet 
7. broadcasts: broadcast packet (including the packets with broadcast address as destination and those broadcasted)
8. fragments: packet with false checksum but with a length less than 64-byte 
9. jabbers: packet with false checksum  and extra length 
10. crc: non-extra-long packet with false checksum  
11. errors: packet with false L2 header
12. overruns: packets that cannot enter queue because it is full  
Meaning of statistics in output: 
1. Shorts, jambos, giants, unicasts, multicasts, broadcasts, jabbers, crc has been explained in input. 
2. deferrals: packets that cannot be transmitted because of timeout 
3. underruns: packets that cannot be transmitted because the speed of PMM is lower than that of the medium
4. aborts: packets that fail to be transmitted because of PMM 
5. collisions: conflicted packets
6. lates: conflicted packets occured after transmitting 64-byte 
7. singles: a single conflicted packet before transmitting 64-byte
8. multiples: multiple conflicted packets before transmitting 64-byte 
9. excessives: packets that have been stopped transmitting because of multiple times confliction
Root Cause
Null
Suggestions
Null

END