Configuring the Maximum Receive Unit for PPP

You can optionally configure the maximum receive unit (MRU) for PPP or MLPPP interfaces. You can configure the maximum number of renegotiation attempts from the Interface Configuration Mode, the Subinterface Configuration mode, and the Profile Configuration mode.

Note: We recommend you coordinate this value with the network administrator on the other end of the line.

If the value configured for the PPP MRU is greater than the value of the lower-layer MRU minus the PPP header length, the router logs a warning message and uses the lesser of the configured MRU value or the lower-layer MRU value minus the PPP header length to negotiate the local MRU. If the value configured for the PPP MRU conflicts with a similar value configured for another protocol, such as the MTU value for PPPoE, the router uses the lesser of the two values.

To configure the maximum receive unit for PPP or MLPPP:

• (Optional) From the Interface Configuration mode, specify the following command:
  host1(config-if)#ppp mru 576

  Use the no version to restore the default value, which causes PPP to use the lower-layer MRU minus the PPP header length as the MRU value.

Related Documentation

• ppp mru