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New Member

max-conn value causing media-loop error

Hi all CUBE gurus,

Can anyone please help out with below issue.

- We are restricting calls to a specific site using max-conn value assigned to dial-peer on main site CUBE router.

- Dial-peer is matched using incoming called-number for the site.

- Main site CUBE router is running IOS 15.1(4) M4

The issue is we are seeing below media loop error ONLY when that dial-peer runs out of connections (max-conn value is reached).

Can anyone please put some lights on what exactly happens when max-conn value is reached (apart from call being dropped) and why it would cause media loop error?

May 21 07:32:01.497: %CALL_CONTROL-6-MAX_CONNECTIONS: Maximum number of connections reached for dial-peer 1234

May 21 07:32:01.777: %VOIP_RTP-6-MEDIA_LOOP: The packet is seen traversing the system multiple times

May 21 07:32:44.197: %CALL_CONTROL-6-MAX_CONNECTIONS: Maximum number of connections reached for dial-peer 1234

May 21 07:32:44.453: %VOIP_RTP-6-MEDIA_LOOP: The packet is seen traversing the system multiple times

May 21 07:34:20.709: %CALL_CONTROL-6-MAX_CONNECTIONS: Maximum number of connections reached for dial-peer 1234

May 21 07:34:21.013: %VOIP_RTP-6-MEDIA_LOOP: The packet is seen traversing the system multiple times

Thanks in advance

Everyone's tags (3)
7 REPLIES

max-conn value causing media-loop error

Without configs, it's guesswork, please include configs of all components involved.

Thanks

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VIP Super Bronze

max-conn value causing media-loop error

Hi,

We need to look at your config to see where the loop is happening. Basically when the maximum connection has been reached on a dial-peer, the gateway will try another dial-peer that macthes that destination. Hence it is possible that you have more than one dial-peer to this destination and it is the config on these other dial-peers that is not quite right. Until we see it we wont know

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New Member

max-conn value causing media-loop error

Thank you both for replying.

Unfortunately, I am unable to put config for the reasons you could imagine. However, I am happy to provide as much info without having to do it.

Aokanlawon

When max-conn is reached and If GW tries to match another dial-peer it will defeat the purpose of max-conn value. I have double checked the config there is no other dial-peer should be matched. However, there is a default hidden dial peer 0. If what you saying is correct, will it match the dial-peer 0?

VIP Super Bronze

max-conn value causing media-loop error

if you cant post config, can you post the output of

'debug voip ccapi inout'

Please rate all useful posts "The essence of christianity is not the enthronement but the obliteration of self --William Barclay"
New Member

max-conn value causing media-loop error

We have increased the max-conn value under the dial-peer and it is less likely to reach the value at this time.

I am interested in knowing what exactly happens when max-conn value is reached from GW perspective. You mentioned it will try and match another dial-peer. Did you have any document mentioning that ? Also, If i assume what you said is correct then most likely callers did not get disconnected and call went through which defeated the purpose of max-conn value.

VIP Super Bronze

max-conn value causing media-loop error

For the puprose of redundancy and CAC you can have a scenario where when a certain amount of call is reached on a dial-peer, another dial-peer should be tried..

eg..dial-peer voice 1 voip

      destination-pattern 7777

    max-conn 2

  session target ipv4:10.10.10.10

dial-peer voice 2 pots

preference 1

destination-pattern 7777

port 0/0/0:15

In this scenario when when a total of two calls are ongoing, and a 3rd call arrives on that dial-peer you will get the following

%CALL_CONTROL-6-MAX_CONNECTIONS: Maximum number of connections reached for dial-peer 1

The call will then attempt to route via dial-peer 2.

So you can see why this can be very useful. It is not just use for stopping a certain number of calls exiting on a dial-peer, those calls can be routed via another route.

However if you say you dont have any other dp, then thats a different issue. the only way to verify is to look at a debug voip ccapi inout

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Cisco Employee

max-conn value causing media-loop error

Hi,

Do you see any errors such as:

%SYS-6-STACKLOW: Stack for process IP Input running low

There is a known bug that can cause the router to crash when having excessive loops:

CSCtb77593    router crashes when RTP loop exists in IPIPGW environment

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtb77593

Seems your versions has the fix, but you might want to double check.

Regards,

Tere.

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Regards, Tere. If you find this post helpful, please rate! :)
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