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New Member

BRI L2 Not ACTIVATED

Hi all,

I have  a voice gateway (ISR 2821) connected to a NT1 through a BRi port.  The normal operating status of this BRI port is:

Global ISDN Switchtype = basic-net3

ISDN BRI0/0/0 interface

    dsl 0, interface ISDN Switchtype = basic-net3

    Layer 1 Status:

    DEACTIVATED

    Layer 2 Status:

    TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED

    Layer 3 Status:

    0 Active Layer 3 Call(s)

    Active dsl 0 CCBs = 0

    The Free Channel Mask:  0x80000003

Layer 1 is deactivated because our telco provider pulls down the physical layer when there is no activity in the link.

By the way, Layer 2 status is active with

assigned TEI 0 (statically assigned in the port configuration).

When I reload the gateway, the status of the interface becomes:

Global ISDN Switchtype = basic-net3

ISDN BRI0/0/0 interface

    dsl 0, interface ISDN Switchtype = basic-net3

    Layer 1 Status:

    DEACTIVATED

    Layer 2 Status:

    Layer 2 NOT Activated

    Layer 3 Status:

    0 Active Layer 3 Call(s)

    Active dsl 0 CCBs = 0

    The Free Channel Mask:  0x80000003

Obviously, when this condition occurs, no dial-peer will match because no ports are available in order to forward outbound calls to the PSTN, and so the callmanager connected to this gateway won't allow any outbound call until the BRI port is available again.

The BRI port stays in this status until an incoming call from the PSTN is received (and TEI is re-assigned).

Is there a way to bring up BRI L2 up automatically?

Many thanks in advance for any help!

Enrico

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

BRI L2 Not ACTIVATED

Configure:

no dial-peer outbound status-check

Unrelated, you don't need to change the default T302 value.

6 REPLIES

BRI L2 Not ACTIVATED

Can you post the output of "sh run int bri 0/0/0"

GTG

Please rate all helpful posts.
New Member

BRI L2 Not ACTIVATED

Thank you for your reply, Gordon!

This is my port conf:

interface BRI0/0/0

no ip address

isdn switch-type basic-net3

isdn overlap-receiving T302 3000

isdn point-to-point-setup

isdn incoming-voice voice

isdn map address .* plan isdn type unknown

isdn send-alerting

isdn sending-complete

isdn static-tei 0

isdn skipsend-idverify

BRI L2 Not ACTIVATED

That's a bit different to my interface configuration - getting out of my depth here..

For reference, my configuration is:

interface BRI0/0/0

no ip address

isdn switch-type basic-net3

isdn tei-negotiation preserve

isdn point-to-point-setup

isdn incoming-voice voice

isdn bind-l3 ccm-manager service mgcp

isdn static-tei 0

GTG

Please rate all helpful posts.
Hall of Fame Super Gold

BRI L2 Not ACTIVATED

Configure:

no dial-peer outbound status-check

Unrelated, you don't need to change the default T302 value.

New Member

BRI L2 Not ACTIVATED

Many thanks Paolo, you are right.

No more checks are performed before routing the call and the interface is activated when needed. Referring to T302 timer, isn't the default value (10000 msec) too long?

@ Gordon: isdn tei-negotiation preserve prevents the gateway to re-negotiate the TEI in case of flapping interface. I thought that it may be useful in cases where TEI is effectively negotiated, but in your case TEI is statically assigned.

Am I wrong?

Thanks to everybody,

Enrico.

Hall of Fame Super Gold

BRI L2 Not ACTIVATED

Thank you for the nice rating and good luck!

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