Cisco 2811 with IMA AIM interface

Looks like a clocking issue to me. We are doing IMA on a
2650 with an
AIM and had to do this:
 
Whenever IMA is being used on a 2650 router which has an AIM
card in
it, there is a nasty problem where (by default) the ATM
takes it
clocking from an internally generated source rather than the
line.
 
Every hour or two the internal clock and the clock from the
network
drift apart far enough to cause the line to drop, then a few
seconds
later it will sync back up.
 
To prevent this, you have to tell the router to use the
network clock
instead of its own internal clocking. Here are the commands
to do so:
 
First, tell the multiflex cards to participate in clocking:
GJC-IMA(config)#network-clock-participate wic 0
GJC-IMA(config)#network-clock-participate wic 1
 
Next, tell the router to take clocking from the multiflex
cards:
GJC-IMA(config)#network-clock-select 1 t1 0/0
GJC-IMA(config)#network-clock-select 2 t1 0/1
 
Last, verify this is actually happening:
GJC-IMA#sh network-clocks
  Network Clock Configuration
  ---------------------------
  Priority      Clock Source    Clock State     Clock Type
 
    0             T1 0/0             GOOD               T1
    1             T1 0/1             GOOD               T1
    5          Backplane             Good               PLL
 
  Current Primary Clock Source
  ---------------------------
  Priority      Clock Source    Clock State     Clock Type
 
    0             T1 0/0             GOOD               T1

 
You can also try:
 
interface ATM1/IMA0
  ima clock-mode common 1

This may be a default though, I'm not sure.
 

Chris Schock
CDHS Telecommunications/ITS
303 866-2669
chris.schockstate.co.us


>>> "Avanzi Enrico"  05/31/06 2:30 AM
>>>

Hello, in my company we have several customers provided with
a Cisco
2811 and
IMA AIM interface connected to the Telco Cisco MGX building
a link of 8
Mbps
(4 x 2 Mbps). The interface configuration is the following

interface ATM0/IMA1.1 point-to-point
description "Internet Access"
ip address 151.x.x.x 255.255.255.192
no ip route-cache
pvc internet 30/100
  protocol ip 151.5.135.1 broadcast
  vbr-nrt 7680 7600 33
  no broadcast
  oam-pvc manage 30
  encapsulation aal5snap

As you can see below the IMA link is flapping up and down
even if the
physical
interfaces are not coming down.
In this case we have the release
c2800nm-spservicesk9-mz.124-1a.bin; we
tried
other version but the problem persists.

May 29 18:20:33: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/1/0 of IMA
Group
ATM.
May 29 18:20:33: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/0/1 of IMA
Group
ATM.
May 29 18:20:33: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/1/1 of IMA
Group
ATM.
May 29 18:22:39: %ATM_AIM-5-ACTIVE_LINK_DOWN: Interface
ATM0/0/0 of IMA
Group
A.
May 29 18:22:39: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/0/0 of IMA
Group
ATM.
May 29 18:22:41: %ATM_AIM-5-ACTIVE_LINK_DOWN: Interface
ATM0/0/1 of IMA
Group
A.
May 29 18:22:41: %ATM_AIM-5-ACTIVE_LINK_DOWN: Interface
ATM0/1/0 of IMA
Group
A.
May 29 18:22:41: %ATM_AIM-5-ACTIVE_LINK_DOWN: Interface
ATM0/1/1 of IMA
Group
A.
May 29 18:22:41: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/0/1 of IMA
Group
ATM.
May 29 18:22:41: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/1/0 of IMA
Group
ATM.
May 29 18:22:41: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/1/1 of IMA
Group
ATM.
May 29 18:22:47: %ATM_AIM-5-ACTIVE_LINK_DOWN: Interface
ATM0/0/0 of IMA
Group
A.
May 29 18:22:47: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/0/0 of IMA
Group
ATM.
May 29 18:22:49: %ATM_AIM-5-ACTIVE_LINK_DOWN: Interface
ATM0/0/1 of IMA
Group
A.
May 29 18:22:49: %ATM_AIM-5-ACTIVE_LINK_DOWN: Interface
ATM0/1/0 of IMA
Group
A.
May 29 18:22:49: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/0/1 of IMA
Group
ATM.
May 29 18:22:49: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/1/0 of IMA
Group
ATM.
May 29 18:23:06: %ATM_AIM-5-ACTIVE_LINK_DOWN: Interface
ATM0/1/1 of IMA
Group
A.
May 29 18:23:06: %ATM_AIM-5-ACTIVE_LINK_UP: Interface
ATM0/1/1 of IMA
Group
ATM.

The interface hardware is:

    WIC Slot 0:
        E1 (2 port) WAN daughter card
        Hardware revision 1.0           Board revision D0
        Serial number     33518408      Part number   
800-04479-03
        Test history      0x0           RMA number    
00-00-00
        Connector type    PCI
        EEPROM format version 1
        EEPROM contents (hex):
          0x20: 01 23 01 00 01 FF 73 48 50 11 7F 03 00 00 00
00
          0x30: 68 00 00 00 05 04 25 00 FF FF FF FF FF FF FF

When the IMa link is flapping the service is still available
but the
custumer
is unable to reach the committed bandwidth.

Have you got any suggestions?

Many thanks

____________________________________________________________
___
Enrico Avanzi




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