Chapter 2 Using the Passport 8683POS Module 33

Negotiating network layer protocols

PPPuses various network control protocols to determine the values of parameters during network layer negotiations, which is the final phase of PPP initialization. Similar to the LCP, each network control protocol allows the devices to negotiate various network options over the data link by transmitting configure-request, configure-ACK, configure-NAK, and configure-reject packets.

Networks options include which network addresses to use and which media types to bridge. Once both devices agree upon networks options, the network control protocol reaches the open state. The devices then begin transmitting user data packets for upper-layer protocols over the link.

Spanning tree group feature

The BPDU (Bridge Protocol Data Unit) format specified in RFC 1638 is enabled by default on the Passport 8683POS Module. If support for multiple spanning tree groups is required, the BPDU default format must first be disabled. For information on changing the STG format, see “config pos ppp” on page 95.

Using the Passport 8683POS Module

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Nortel Networks 8683POS manual Spanning tree group feature, Negotiating network layer protocols