Cabletron Systems CSX400 - Manual (Page 78)

CSX WAN Configuration
4-14 Configuring the PPP Protocol
Remote MRU
The Remote MRU Þeld displays the Maximum Receive Unit (MRU) established
for the remote interface at the other end of the PPP Link (the value that the local
entity is using when sending packets to the remote PPP entity).
Local —> Remote Comprs (Compression)
By default, a PPP link must be able to transmit packets with two-octet PPP
Protocol Field values; however to conserve bandwidth on low speed links, PPP
was designed to omit redundant data by allowing some PPP Protocol Field values
to be compressed into a single octet that can be readily recognized from its two-
octet form.
The LocalÐ>Remote Comprs conÞguration option indicates whether Protocol
Field Compression (PFC) is Enabled or Disabled at the local PPP entity when it
transmits packets to the remote PPP entity. Packets with compressed Protocol
Field values must not be transmitted until this value has been negotiated between
both PPP entities.
Remote —> Local Comprs (Compression)
This conÞguration option indicates whether Protocol Field Compression (PFC) is
Enabled
or Disabled at the remote PPP entity when it transmits packets to the
local PPP entity. Packets with compressed Protocol Field values must not be
transmitted until this value has been negotiated between both PPP entities.
Tx FCS Size
The size of the Frame Check Sequence (FCS) in bits that the local node will
generate when sending packets to the remote node. The value of this object is
meaningful only when the link has reached the open state. 16 bits is the only FCS
size supported.
Rx FCS Size
The size of the Frame Check Sequence (FCS) in bits that the remote node will
generate when sending packets to the local node. The value of this object is
meaningful only when the link has reached the open state.
Link Control Protocol Configuration Fields
The LCP ConÞguration section shows parameters which will be communicated
by LCP during the link establishment phase between the CSXÕs local interfaces
and the remote interfaces at the other end of the link, and lets you alter those
parameters at the local interfaces, if necessary.
If#
The SNMP MIB-2 ifIndex of the physical interface on the CSX at which the PPP-
Link is conÞgured.