Cisco Ethernet Interface statistic does not count CRC (4 Bytes). why?
While working on lab testing, i have noticed that the ASR9K ethernet interface (GE) Rx Byte count does not match with the Test Gear (IXIA)'s Tx Byte count. Forther testing, it looks to me that Cisco interface statistic seems not including the 4 Bytes of CRC in its count.
Can anyone confirm this? if not, point me to correct information and Cisco Link if avaiable?
Above, ASR9K port shows 10 Frames and total 15140 Bytes Rx count. But, Directly connected Test Gear port have Tx'd 10 of frames with the size of 1518. I was expecting the ASR statistic of 15180, instead of 15140. I have ran packet capture and checked with Wireshark and confirmed the original frame size is 1518. any explanation?
Cisco Ethernet Interface statistic does not count CRC (4 Bytes).
Hello Won Lee,
Input bytes in show interface statistic excludes the FCS bytes. This is per design of the IOS-XR. However, SNMP IF-MIB does include FCS byte in ifInOctets, ifOutOctets, ifHCInOctets, ifHCOutOctets. This behavior is documented on ddts CSCth69314: [NOT-A-BUG] IPv4 and IPv6 GE/10GE stats use incorrect layer2 length
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