IP Control Protocol Ipcp | Enterasys Networks X-PeditionTM specs

PPP Features

Table 8-2 Multi-Class MLPPP Negotiation (continued)

		Option Type

present	nil	present/Code = 6	MLPPP with Short Sequence # & Multi-Class

present	present	present	Not valid

The class number is defaulted to five for both short and the long sequence numbers. That includes four suspendable levels from 0 to 4 with the highest level at 5. The current limits on memory and throughput set the optimized number of class to 4 for the XSR.

The result of the number of suspendable classes after negotiation will set MLPPP to support up to that level of classes both for transmission and receipt. The suspendable level could differ between transmission and receipt depending on negotiation with the peer. For example, if the local peer is defaulted at a level of five classes and the remote peer has a level of two classes, following negotiation, the local peer could have two transmitting classes acknowledged by the remote peer and five receiving classes acknowledged by the remote peer.

Events and Alarms

Multi-Class Option Negotiation

When Multi-Class is enabled on MLPPP, every member under the bundle uses the same value to perform negotiation, and the member link under the bundle sets the negotiated value for Multi- Class, such as header format and suspendable level. The remainder of the member link must have same negotiated values, otherwise it will be rejected from joining the same bundle.

Multi-Class Receiving Packet

When a MLPPP packet is received with the class number outside the negotiated suspendable levels, as:

•A class number larger than the negotiated suspendable level,

•A non-zero class number is present when the non Multi-Class option is negotiated,

The packet is silently discarded and the discard count for the bundle statistics increased. Also, the following PPP debug message is generated:

MLPPP: Invalid Class Num