Interface Configuration
7750 SR Interface Configuration Guide Page 53
• HELLO_ACK
• REMOVE_LINK
• REMOVE_LINK_ACK
The control messages are encapsulated in a single-fragment frame where the C-bit, the B-bit, and
the E-bit are all set. The details of the message format are given in FRF.16.1. Table 8 lists the user
configured control parameters with values as specified in FRF.16.1.
T_HELLO Timer - this timer controls the rate at which hello messages are sent. Following a
period of T_HELLO duration, a HELLO message is transmitted onto the Bundle Link.
Note that T_HELLO Timer is also used, during the Bundle Link adding process, as an additional
delay before re-sending an ADD_LINK message to the peer Bundle Link when this peer Bundle
Link does not answer as expected.
T_ACK Timer - this timer defines the maximum period to wait for a response to any message
sent onto the Bundle Link before attempting to retransmit a message onto the Bundle Link.
N_RETRY - this counter specifies the number of times a retransmission onto a Bundle Link will
be attempted before an error is declared and the appropriate action taken.
Table 8: FRF.16.1 Values
Parameter Default Value Minimum Value Maximum Value
Timer T_HELLO 10 seconds 1 second 180 seconds
Timer T_ACK 4 seconds 1 second 10
Count N_MAX_RETRY 2 1 5
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