Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 1 PPP and MP Configuration Commands
3Com Corporation
1-11
Description
Use the ppp lcp mru consistent command to enable PPP LCP to negotiation
maximum receive unit (MRU).
Use the undo ppp lcp mru consistent command to restore the default.
By default, PPP LCP does not negotiate MRU; the local end modifies MTU depending
on the remote MRU.
After PPP LCP is enabled to negotiate MRU, the MRU value carried in the LCP
CONREQ message received from the remote end cannot be less than the MTU value
configured on the local interface. If a smaller MRU value is received, the local end
sends a CONNAK message to the remote end. If the received MRU value is still smaller
after the local end makes a specified number of CONNAK message sending attempts,
the local end sends a CONREJ message to disable MRU negotiation. The MRU
negotiation attempts made by the remote end after that will always fail.
Normally, after PPP LCP negotiation succeeds, the MTU at the local end does not
change as the remote MRU changes.
Example
# Enable PPP LCP to negotiate MRU.
[Router-Serial0/0/0] ppp lcp mru consistent
1.1.12 ppp lqc
Syntax
ppp lqc forbidden-percentage [ resumptive-percentage ]
undo ppp lqc
View
Interface view
Parameter
forbidden-percentage: Link quality percentage threshold. Once the quality of a link
decreased below this percentage, the link is taken down. It is in the range 0 to 100.
resumptive-percentage: Link quality percentage threshold. The link that has been taken
down is brought up again once its quality exceeds this percentage. It is in the range 0 to
100.
Description
Use the ppp lqc command to enable PPP link quality control (LQC).