![Cisco BTS 10200 Softswitch Скачать руководство пользователя страница 816](http://html.mh-extra.com/html/cisco/bts-10200-softswitch/bts-10200-softswitch_troubleshooting-manual_67550816.webp)
B-8
Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Appendix B System Usage of MGW Keepalive Parameters, Release 5.0
Keepalive for Release 5.0 Prior to Maintenance Release 1.1
MGCP-MAX2-RETRIES, MGCP-T-MAX and 2*MGCP-T-HIST
The BTS 10200 limits retransmissions of the AUEP message to
mgcp-max2-retries
or a total duration
of
mgcp-t-max
(default = 20 seconds), whichever occurs first.
If the system does not receive an ACK before the expiration of
2*mgcp-t-hist
(two times the provisioned
value for mgcp-t-hist), it abandons the transaction and takes
one
of the following additional actions:
•
If keepalive functionality is
enabled
on the system (
mgw-monitoring-enabled=Y
and
keepalive-method=AUEP
as described in the
“Provisionable Parameters” section on page B-2
), the
system expedites the KA process (as described in the
“Keepalive Process” section on page B-9
without immediately declaring the termination to be unreachable. However, if the KA process also
fails, the system declares the MGW and all associated terminations to be unreachable. The
operational status of each of the terminations is marked as TERM_UNREACH.
•
If keepalive functionality is
disabled
on the system, the system marks the operational status of each
of the terminations as UNKNOWN.
shows how the system handles AUEP retransmissions and takes action if no ACK is received.
In this example, mgcp-max2-keepalive attempts are completed before the expiration of mgcp-t-max. In
general, the system stops retransmissions when mgcp-max2-keepalive attempts are completed or at the
expiration of mgcp-t-max, whichever occurs first.
Figure B-4
Timeout Limitations When No ACK Is Received
mgcp-t-max (default = 20 seconds)
Maximum time allowed for retransmissions.
2 * mgcp-t-hist
BT
S
10200 declares endpoint unreachable
after this time if no ACK received.
(No additional
retransmissions sent)
mgcp-max1-retries (default = 2)
Maximum number of AUEP
retransmissions sent to each
IP address of the MGW.
mgcp-max2-retries (default =
3
)
Maximum number of AUEP
retransmissions sent to the
last IP address of the MGW.
25002
3
Time
mgcp-t-tran
2*mgcp-t-tran
4*mgcp-t-tran
8
*mgcp-t-tran
KA attempt
(AUEP transaction)
AUEP,
initial
transmission
16*mgcp-t-tran
AUEP,
2nd transmission
(1st retransmission)
AUEP,
3
rd transmission
(2nd retransmission)
AUEP,
4th transmission
(
3
rd retransmission)