Symptoms :- ISDN layer 1 is active and Layer 2 going up and down with error “TEI_ASSIGNED”
There could be following missing command under signaling interface at Telco end if they are using Cisco Gateway.
A. and C. do not have sense.
B, is talking about a possibility of a intermittent service, it could be swinging between up and down. These errors can be viewed in the show controllers T1, however, the Layer 2 can be viewed in state MULTIPLE_FRAME_ESTABLISHED even though these slips errors.
D. could be the best answer, simply on side can not understand the frames from the other side, mean while while one side is sending SABME's like crazy and not receiving anything from the other side that could be solved with a correct configuration. I do not know if the problem is the framing or a bad configuration in the Serial interface (isdn protocol-emulate command), because it is stupid to be guessing without without having debug isdn q921and show controller t1 outputs, however, the only reason about the problem is a configuration issue, and just the answer D shows us "configured incorrectly". Something is configured incorrectly, without a doubt.
Furthermore, the show isdn status command displays a summary of the current status. Therefore, Layer 2 can bounce up and down even though it indicates a MULTIPLE_FRAME_ESTABLISHED state. It is needed to use the debug isdn q921 command to ensure that Layer 2 is stable. This situation can be leveraged by a incorrect clock, however, as we do not have debug isdn q921, we are forced to assume that clock is correct and no slip erros.
Please refer to (it is amazing this document):
Troubleshoot T1 PPRI
https://www.cisco.com/c/en/us/support/docs/wan/t1-e1-t3-e3/8131-T1-pri.pdf
This section is not available anymore. Please use the main Exam Page.350-801 Exam Questions
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
santiagof
Highly Voted 2 years, 6 months agoASSH
2 years, 6 months agosantiagof
2 years, 6 months agoMeowthL
2 years, 1 month agoMeowthL
2 years, 1 month agoG0y0
Most Recent 2 months agoG0y0
2 months agodecdca7
5 months, 4 weeks agodecdca7
5 months, 4 weeks agodecdca7
5 months, 4 weeks agoJoeC716
1 year agodbayt
1 year, 6 months agokitty73
1 year, 9 months agoPiji
2 years, 8 months ago