IBM SC30-3681-08 Remote Username, Last Identication Rxd, Time Connected, LCP Option, Bit checksum

Monitoring PPP Interfaces (Talk 5)

Remote Username

When authentication is required on the link, this ®eld shows the name that the peer supplied.

Last Identi®cation Rx'd

An optional packet type that is de®ned for LCP is an ªIdenti®cationº packet. The contents of this packet are unde®ned but are normally expected to be a human-readable string provided by the peer to

give some identifying information such as a name, manufacturer, model number, or other information the manufacturer wishes to provide. If the router receives such a packet, the contents of the last such packet received are displayed here.

Time Connected

Indicates how long the peer has been connected on this link.

LCP Option

These ®elds indicate the values of options that have been negotiated with the peer when LCP is in the Open state. When LCP is not open, these values represent initial defaults or con®gured values that will be used in subsequent LCP negotiations.

Max Receive Unit

Indicates the maximum length for the packet size that the local and remote ends can transmit. This is the maximum length of the payload portion of a PPP packet and it does not include PPP header and trailer bytes.

When LCP is in an Open state, the values indicate the lengths that have been negotiated with the peer. The router does not support differing MRU lengths for the peer and local end, so these values will be the same.

Async Character Mask

This indicates the asynchronous control character mask that has been negotiated. The router accepts ACCM negotiation even on synchronous lines, although this does not affect the actual packet data sent. See the set lcp options command on page 479 for more information about the ACCM.

Authentication

Indicates which authentication protocol, if any, each end of the link requires. Multiple protocols may be available at each end; this value indicates which protocol the units agreed to use.

Magic number

Displays the current magic number being used for both the local and remote ends of the link for loopback detection.

Protocol compression

Indicates whether PFC has been negotiated.

Address/Control compression

Indicates whether ACFC has been negotiated.

32-bit checksum

Not currently supported. PPP will reject this option if it is received.

Example of the List Control BCP Command

Example:

Chapter 33. Con®guring and Monitoring Point-to-Point Protocol Interfaces 489