Alcatel-Lucent 7705 Interface Configuration Manual page 35

Padding
On transmission, the Information field of the ending fragment may be padded with an
arbitrary number of octets up to the MRRU. It is the responsibility of each protocol to
distinguish padding octets from real information. Padding must only be added to the last
fragment (E-bit set to true).
FCS
The FCS field of each MP packet is inherited from the normal framing mechanism from the
member link on which the packet is transmitted. There is no separate FCS applied to the
reconstituted packet as a whole if it is transmitted in more than one fragment.
LCP
The Link Control Protocol (LCP) is used to establish the connection through an exchange of
configure packets. This exchange is complete, and the LCP opened state entered, once a
Configure-Ack packet has been both sent and received.
LCP allows for the negotiation of multiple options in a PPP session. MP is somewhat
different from PPP, and therefore the following options are set for MP and are not
negotiated:
Any non-LCP packets received during this phase must be silently discarded.
T1/E1 Link Hold Timers
T1/E1 link hold timers (or MLPPP link flap dampening) guard against the node reporting
excessive interface transitions. Timers can be set to determine when link up and link down
events are advertised; that is, up-to-down and down-to-up transitions of the interface are not
advertised to upper-layer protocols (are dampened) until the configured timer has expired.
7705 SAR OS Interface Configuration Guide
• no async control character map
• no magic number
• no link quality monitoring
• address and control field compression
• protocol field compression
• no compound frames
• no self-describing padding
7705 SAR Interfaces
Page 35