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New Member

BRIs Keep Flapping UP/DOWN 15 SEC MGCP - HELP!

Hi All,

Just running a test CUCM manager on VMware hence no tac case, both my BRI interfaces keep flapping every 15 seconds due to MGCP.

Could be the call manager, but its harder to post debugs from...

Calls all work fine cos its only down .1 secs

Any ideas on what to check??? THANKS!

HOR-VGW#show mgcp statistics

UDP pkts rx 489892, tx 489939

Unrecognized rx pkts 0, MGCP message parsing errors 0

Duplicate MGCP ack tx 0, Invalid versions count 0

CreateConn rx 287, successful 287, failed 0

DeleteConn rx 287, successful 287, failed 0

ModifyConn rx 557, successful 557, failed 0

DeleteConn tx 0, successful 0, failed 0

NotifyRequest rx 183, successful 183, failed 0

AuditConnection rx 0, successful 0, failed 0

AuditEndpoint rx 46, successful 42, failed 4

RestartInProgress tx 24, successful 24, failed 0

Notify tx 488508, successful 488508, failed 0

ACK tx 1356, NACK tx 4

ACK rx 488532, NACK rx 0

Collisions: Passive 0, Active 0

interface BRI0/0/0

description OnRamp2

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

isdn bind-l3 ccm-manager service mgcp

isdn static-tei 0

!

voice-port 0/0/0

compand-type a-law

cptone AU

bearer-cap Speech

!

ccm-manager fallback-mgcp

ccm-manager mgcp

!

mgcp

mgcp call-agent 203.xx.12.53 2427 service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode out-of-band

mgcp rtp unreachable timeout 1000 action notify

mgcp modem passthrough voip mode nse

mgcp ip qos dscp cs3 signaling

mgcp package-capability rtp-package

mgcp package-capability sst-package

mgcp package-capability pre-package

no mgcp package-capability res-package

no mgcp package-capability fxr-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax rate 14400

no mgcp fax t38 ecm

mgcp fax t38 inhibit

mgcp rtp payload-type g726r16 static

mgcp bind control source-interface GigabitEthernet0/1

mgcp bind media source-interface GigabitEthernet0/1

!

mgcp profile default

Oct 1 05:55:10.219: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0/1, TEI 0 changed to down

Oct 1 05:55:10.231: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/1, TEI 0 changed to up

Oct 1 05:55:10.587: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0/0, TEI 0 changed to down

Oct 1 05:55:10.603: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/0, TEI 0 changed to up

Oct 1 05:55:25.223: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0/1, TEI 0 changed to down

Oct 1 05:55:25.251: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/1, TEI 0 changed to up

Oct 1 05:55:25.591: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0/0, TEI 0 changed to down

Oct 1 05:55:25.607: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/0, TEI 0 changed to up

Oct 1 05:55:40.231: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0/1, TEI 0 changed to down

Oct 1 05:55:40.247: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/1, TEI 0 changed to up

Oct 1 05:55:40.599: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0/0, TEI 0 changed to down

Oct 1 05:55:40.615: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/0, TEI 0 changed to up

9 REPLIES
Silver

Re: BRIs Keep Flapping UP/DOWN 15 SEC MGCP - HELP!

check the layer 1 issue, check the cables if possible replace them with the new ones.

Do a shut and no shut on the BRI Interface.

Reload on the router if possible.

New Member

Re: BRIs Keep Flapping UP/DOWN 15 SEC MGCP - HELP!

Thanks, but not layer 1, when MGCP is disabled services are 100%. router has been reloaded. Also rebuilt server on physical instead of VMware.

I believe it has something to do with MGCP timers but im not up to speed on those... any other ideas?

Cheers

New Member

Re: BRIs Keep Flapping UP/DOWN 15 SEC MGCP - HELP!

Hi,

I have exactly the same problem. Did you find something?

Apparently it's not a problem for the calls, but it's strange...

Thank you.

Yorick

New Member

Re: BRIs Keep Flapping UP/DOWN 15 SEC MGCP - HELP!

Actually I havent fixed it, just a test system so im not too concerned. I think it affects a few calls as the BRI is down about 1% of the time, so not often but occassionally you might need to hit redial.

Which country are you in?

New Member

Re: BRIs Keep Flapping UP/DOWN 15 SEC MGCP - HELP!

I am also having this issue - Did anyone resolve this?

Thanks

Hall of Fame Super Gold

Re: BRIs Keep Flapping UP/DOWN 15 SEC MGCP - HELP!

I recommned you use H.323 for BRI. MGCP is too buggy to be reliable.

New Member

Re: BRIs Keep Flapping UP/DOWN 15 SEC MGCP - HELP!

Yes, unfortunately I never resolved it, just migrated to H.323 which doesnt report any errors. If you need a config just ask

New Member

Re: BRIs Keep Flapping UP/DOWN 15 SEC MGCP - HELP!

Yes please James - Can you forward me an alternate H323 config - Thanks

New Member

Re: BRIs Keep Flapping UP/DOWN 15 SEC MGCP - HELP!

This is a cut down version of what I have, but its a lab environment only so you will need to fix up the dial peers etc

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