Cabletron Systems CSX400, CSX200 Bad FCSs, Total Errors, Statistics, Local MRU, Remote MRU, 4-28

Bridging

Bad FCSs

The Bad FCSs Þeld displays the number of received packets that were discarded due to having an incorrect FCS (Frame Check Sequence) value.

Total Errors

The Total Errors Þeld displays the total number of errors of all types: Bad

Addresses, Bad Controls, Packets Too Long, and Bad FCSs.

Statistics

Local MRU

The Local MRU Þeld displays the current value of the MRU (Maximum Receive Unit) for the local PPP entity. This value is the MRU that the remote entity uses when sending packets to the local PPP entity. The MRU is the maximum length of data information (included ÒpaddedÓ data octets, but excluding the Protocol Þeld which identiÞes the datagramÕs protocol type) that can be received by this interface. The default MRU size is 1500 octets. The auto-negotiation process may establish another value for MRU if consent is given at both ends of the PPP link (if either the local or remote PPP entity informs the other that larger packets can be sent, or requests that smaller packets be sent).

Remote MRU

The Remote MRU Þeld displays the current value of the MRU (Maximum Receive Unit) established for the remote interface at the other end of the PPP Link. This value is the MRU that the local entity uses when sending packets to the remote PPP entity.

Local to Peer ACC Map

The Local to Peer ACC Map Þeld displays the current value of the Asynchronous Control Character (ACC) Map used for sending packets from the local PPP entity to the remote PPP entity. In effect, this is the ACC Map that is required in order to ensure that all characters can be successfully transmitted through the local modem. The actual ACC Map used on the transmit side of the link will be a combination of the local nodeÕs pppLinkConÞgTransmitACCMap and the remote nodeÕs pppLinkConÞgReceiveACCMap.

Peer to Local ACC Map

The Peer to Local ACC Map Þeld displays the Asynchronous Control Character (ACC) Map used by the remote PPP entity when transmitting packets to the local

PPPentity. In effect, this is the ACC Map that is required in order to ensure that the local modem will successfully receive all characters. The actual ACC Map used on the receive side of the link will be a combination of the local nodeÕs pppLinkConÞgReceiveACCMap and the remote nodeÕs pppLinkConÞgTransmitACCMap.

4-28 Bridge Statistics