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Hall of Fame Master

PRI and BRI on same GW causing clock issues

I have a GW with 2 E1-PRIs on dedicated NM module and BRI cards in HWIC slots. Whenever call is received on BRI and ISDN L3 comes up clocking is transitiong from E1-PRI to BRI even though the E1 has higher priority. As soon as the BRI L3 goes down after call completion the clocking transitions to backplane resulting in slips/etc:

Jun  6 21:23:22.194: ISDN BR0/0/1 Q931: Ux_DLRelInd: DL_REL_IND received from L2

Jun  6 21:23:23.194: ISDN BR0/0/0 Q931: Ux_DLRelInd: DL_REL_IND received from L2

Jun  6 21:23:53.762: ISDN BR0/0/0 Q931: L3_ShutDown: Shutting down ISDN Layer 3

Jun  6 21:23:53.762: ISDN BR0/0/1 Q931: L3_ShutDown: Shutting down ISDN Layer 3

Jun  6 21:23:53.814: %LINK-3-UPDOWN: Interface BRI0/0/0, changed state to down

Jun  6 21:23:53.814: %LINK-3-UPDOWN: Interface BRI0/0/1, changed state to down

Jun  6 21:23:53.914: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller BRI0/0/0

Jun  6 21:24:04.162: %MARS_NETCLK-3-HOLDOVER_TRANS: Holdover timer exceeded for Controller BRI0/0/0

Jun  6 21:24:04.162: %MARS_NETCLK-3-CLK_TRANS: Network clock source transitioned from priority 3 to priority 10

Jun  6 21:23:22.654: %MARS_NETCLK-3-HOLDOVER_TRANS: Holdover timer exceeded for Controller E1 1/0

Jun  6 21:23:22.654: %MARS_NETCLK-3-CLK_TRANS: Network clock source transitioned from priority 1 to priority 3

  Network Clock Configuration

  ---------------------------

  Priority      Clock Source    Clock State     Clock Type

     1          E1 1/0          LINK DOWN       E1         

     2          E1 1/1          LINK DOWN       E1         

     3          BRI0/0/0        GOOD            BRI        

     4          BRI0/0/1        GOOD            BRI        

     5          BRI0/1/0        LINK DOWN       BRI        

     6          BRI0/1/1        LINK DOWN       BRI        

    10          Backplane       GOOD            PLL        

  Current Primary Clock Source

  ---------------------------

  Priority      Clock Source    Clock State     Clock Type

     3          BRI0/0/0        GOOD            BRI        

My network-select config:

network-clock-participate slot 1

network-clock-participate wic 0

network-clock-participate wic 1

network-clock-select 1 E1 1/0

network-clock-select 2 E1 1/1

network-clock-select 3 BRI0/0/0

network-clock-select 4 BRI0/0/1

network-clock-select 5 BRI0/1/0

network-clock-select 6 BRI0/1/1

Does anyone know why this is happening?

Chris

2 REPLIES 2
Highlighted
Hall of Fame Master

From the output above, the E1 circuits appears to be down, consequently they cannot be clock source.

Highlighted

Paolo,

Thanks for taking a look.  The E1 was down after the call arrived on the BRI port, in order to get it back I need to shut/no shut the controller. Here is how it looked before the call arrived on BRI:

  Network Clock Configuration

  ---------------------------

  Priority      Clock Source    Clock State     Clock Type

     1          E1 1/0          GOOD            E1         

     2          E1 1/1          GOOD            E1         

     3          BRI0/0/0        LINK DOWN       BRI        

     4          BRI0/0/1        LINK DOWN       BRI        

     5          BRI0/1/0        LINK DOWN       BRI        

     6          BRI0/1/1        LINK DOWN       BRI        

    10          Backplane       GOOD            PLL        

Chris