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Chapter 2 Using the Passport 8683POS Module 33
Using the Passport 8683POS Module
Negotiating network layer protocols
PPP uses 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.