08-01-2008 05:00 PM - edited 03-15-2019 12:22 PM
I just found out that one of my redundant PRIs is in spoof mode but I did not get a rtmt alert. Since it is redundant, I did not catch this for a couple of days.
#sh int s0/0/0:23
Serial0/0/0:23 is up, line protocol is up (spoofing)
Per doc, the current valid MGCP PRI monitor is the D channel which is represented by the S0/0/0:23 that I posted and which corresponds with RTMT terminology of âDataLinkInServiceâ below. Since the PRI was âspoofedâ it showed up/up and RTMT could not alert us on it. I am currently revisiting the RTMT alert design to see if we can catch this in the future but given the current research, I am not sure if this is something RTMT can catch and be a limitation of the tool itself to this particular scenario.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/6_0_1/rtmt/rtpmcm.html#wp1012748
DatalinkInService This counter represents the state of the Data Link (D-Channel) on the corresponding digital access gateway. This value will be set to 1 (one) if the Data Link is up (in service) or 0 (zero) if the Data Link is down (out of service).
Is there a way to catch this
08-07-2008 05:47 AM
Go through this Media Gateway Control Protocol (MGCP)
http://www.cisco.com/en/US/tech/tk652/tk701/tk419/tsd_technology_support_sub-protocol_home.html
08-07-2008 06:13 AM
This is by design. Your PRI's should be in spoofing mode.
When you do a show int s0/0/0:23 you should see this:
Serial0/0/0:23 is up, line protocol is up (spoofing)
Hardware is DSX1
MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Last input 00:00:27, output never, output hang never
Last clearing of "show interface" counters 00:00:02
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 48 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Timeslot(s) Used:24, SCC: 0, Transmitter delay is 0 flags
If the D-channel goes down, RTMT will get an alert. Another way to check D-channel status is:
show isdn status
You should see MULTIFRAME-ESTABLISHED. If you see TEI-ASSIGNED, the D-channel more than likely isn't up and RTMT should generate alerts.
Thank you,
Jon
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