B-22
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 Maintenance Release 1.1 and Later
is applicable when two IP addresses are provisioned for the MGW in the DNS server. It
illustrates the scenario in which the initial AUEP transmission does not receive an ACK message, but an
ACK is received in response to retransmissions.
Figure B-15
Two IP Addresses in DNS, ACK Received after Retransmissions
Note
The system attempts up to four different IP addresses for any single MGW listed in the DNS server. (This
maximum number of IP addresses is not provisionable.)
Time
AUEP, initial
transmission
ACK
received
trying 2nd IP address
mgcp-t-tran
2*mgcp-t-tran
4*mgcp-t-tran
8
*mgcp-t-tran
mgcp-max2-retries,
for 2nd IP address
(default =
3
)
mgcp-max1-retries completed.
If no ACK is received, proceed to
next IP address and continue.
250021
Time
AUEP, initial
transmission
mgcp-t-tran
2*mgcp-t-tran
4*mgcp-t-tran
KA attempt
(AUEP transaction),
successful
mgcp-max1-retries,
for 1st IP address
(default = 2)
trying 1st IP address
AUEP,
2nd transmission
(1st retransmission)
AUEP,
3
rd transmission
(2nd retransmission)
AUEP,
2nd transmission
(1st retransmission)
AUEP,
3
rd transmission
(2nd retransmission)
AUEP,
4th transmission
(
3
rd retransmission)