9-5
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
78-6511-08
Chapter 9 Troubleshooting
Statistics
Table 9-3 LRE Link Statistics
Statistic Type Explanation
Upstream Bandwidth Usage The percentage of the bandwidth used for upstream traffic, based on the current upstream rate
and actual upstream speed of LRE link.
Downstream Bandwidth
Usage
The percentage of the bandwidth used for downstream traffic, based on the current
downstream rate and actual downstream speed of the LRE link.
Signal to Noise Ratio The amount of increased received signal noise (in decibels) relative to the ambient,
environment, and electromagnetic noise power level that the switch is designed to tolerate
without disconnecting from the remote LRE CPE. The higher the ratio, the more resilient the
link.
Upstream Reed-Solomon
Errors
The number of detected and corrected data errors being received on the switch LRE port.
Reed-Solomon errors result from noise exceeding the noise margin. For short bursts of noise
(such as motor startup or power surges), the Reed-Solomon error correction prevents the loss
of Ethernet data packets.
The LRE interface corrects the data bytes that are incorrectly received on the switch LRE port
(up to a designed 8-byte limit). The residual error rate is better than the detection capability
of the Ethernet cyclic redundancy check (CRC). If the error burst is larger than the correction
capability of the LRE interface, the Ethernet CRC is used to determine the corrupted packets
and to discard them.
Downstream Reed-Solomon
Errors
The number of detected and corrected data errors being received on the CPE RJ-11 wall port.
Table 9-4 CPE Ethernet Link Statistics
Counter Description
Tx Octets The count of octets sent from an LRE CPE Ethernet port.
Tx Drop Pkts The count of packets dropped during transmission out an LRE CPE Ethernet port.
Tx Broadcast Pkts The count of packets with a broadcast destination sent from LRE CPE Ethernet port.
Tx Multicast Pkts The count of packets with a multicast destination sent from an LRE CPE Ethernet port.
Tx Unicast Pkts The count of packets with a unicast destination sent from an LRE CPE Ethernet port.
Tx Collisions The count of packets that could not be sent due to a single collision on the medium.
Tx Multiple Collisions The count of packets that could not be sent due to multiple collisions on the medium.
Deferred transmits The count of packets that could not be sent because the medium was busy
Late collisions The count of packets that were not sent because a collision happened after 512 bit times into
the transmission of the packet.
Excessive collisions The count of packets that could not be sent due to excessive collisions.
In frame discards The number of valid packets received that were discarded due to lack of space on an output
queue.
Tx Pause Pkts The count of 802.3X pause frames sent out by the LRE CPE Ethernet port.
Carrier sense errors The number of times that the carrier sense condition was lost or never asserted when
attempting to send a frame on the Ethernet interface of a CPE.
Rx Octets The count of octets received by the LRE CPE Ethernet port.
Rx Undersize Pkts The count of packets received by the LRE CPE Ethernet port, with size lesser than 64 bytes.
To Next Page
Loading...
Need help?
General