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Configuring PPP Services

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308639-14.00 Rev 00

Parameter: MRU Size (bytes)

Path: Protocols > PPP > Interfaces > Lines

Default: 1590 (leased lines)

1500 (dial lines)

Options: 1 to 4600

Function: Sets the maximum receive unit (MRU) size, in bytes, for the line.

Instructions: The router determines the MRU size based on the value of the RFC1661

Compliance parameter and whether the connection is a leased line or a dial line.

For leased lines, set the RFC1661 Compliance parameter to Disable. The router

will then negotiate the MRU size automatically; there is no need to manually

configure the MRU size.

For dial lines, accept the default value for the RFC1661 Compliance parameter

(Enable). With RFC1661 Compliance enabled, you can manually configure the

MRU size. In most cases, you should accept the default value, 1500 bytes.

However, if you configure an MRU size other than the default, be aware that the

router can negotiate only for an MRU value that is larger than its configured

value. The range that it can negotiate is between the configured MTU size and

the router driver MTU value, minus the PPP header and CRC size. For example,

if the configured MTU is 1500 and the driver MTU is 1600, the negotiation

range is 1500 to 1590 (1600 - 8 - 2 = 1590). We recommend that the peer be

configured for an MRU value of at least 1500 bytes. Note also that the router

and its peer do not have to use the same MRU value to communicate with one

another.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.2.1.1.48

Parameter: RFC1661 Compliance

Path: Protocols > PPP > Interfaces > Lines

Default: Enable

Options: Enable

Disable

Function: Enables RFC 1661 compliance for a PPP dial circuit. RFC 1661 defines the

standards for PPP operation.

Instructions: Accept the default, Enable, to make the PPP dial circuit RFC 1661-compliant.

For PPP leased lines, select Disable.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.2.1.1.49

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Avaya Configuring PPP Services Bedienungsanleitung Seite 128