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New Member

ATM IMA Config

Good Evening,

I have a 3825 router with a NM-8T1-IMA NM module configured as follows:

interface ATM1/0
no ip address
ip pim sparse-mode
no scrambling-payload
ima-group 0
no atm ilmi-keepalive
clock source line

interface ATM1/1
no ip address
ip pim sparse-mode
no scrambling-payload
ima-group 0
no atm ilmi-keepalive
clock source line

interface ATM1/2
no ip address
ip pim sparse-mode
no scrambling-payload
ima-group 0
no atm ilmi-keepalive
clock source line

interface ATM1/3
no ip address
ip pim sparse-mode
no scrambling-payload
ima-group 0
no atm ilmi-keepalive
clock source line

interface ATM1/4
no ip address
ip pim sparse-mode
no scrambling-payload
ima-group 0
no atm ilmi-keepalive
clock source line

interface ATM1/5
no ip address
ip pim sparse-mode
no scrambling-payload
ima-group 0
no atm ilmi-keepalive
clock source line

interface ATM1/IMA0
no ip address
ip pim sparse-mode

ima clock common 0
no atm ilmi-keepalive

interface ATM1/IMA0.32 point-to-point
description PVC to Grand River Hospital
ip address x.x.x.x 255.255.255.252
ip pim sparse-mode
ip igmp version 3
pvc 1/32
  vbr-nrt 4000 4000
  encapsulation aal5snap

The ATM interfaces will show a status of Receive "FailedNoReason" after applying a shut, no shut.  It appears that the interfaces flap when attempting to join the IMA group.  I am sure I am missing something simple since I'm tired and have a migraine at the moment.

5 REPLIES
Hall of Fame Super Gold

Re: ATM IMA Config

To begin with, do the T1s show up and error free ? Has that ever worked before ?

New Member

Re: ATM IMA Config

Good Morning,

The 3825 is replacing a 2821 with the ATM bundle and 3 vwics.  I am currently working on upgrading from 3 T1s to 5 T1s at this site, and that is why we went with the 3825 and the NM-8T1-IMA.  The T1s on the carrier side are up with no error, and are working flawlessly on the 2821 at the moment (I had to cut back over to it for business today).

On the 3825/NM-8T1-IMA if I remove one of the ATM interfaces from the IMA group it will come up, but if it assigned to the IMA group it will initially come up, and then go down after about 10 seconds.  I had ATM and IMA error debuging on and I did not see any errors.

I'm not on my work laptop so I will have to see if I saved the captures from the sh ima interface etc.  I believe the Rx was going into a unusable failed state.

My first thought was that I have the clock source setup wrong on the IMA group?

Hall of Fame Super Gold

Re: ATM IMA Config

Problem is the NM AIM is an older module, not "ISR generation" and may have not been tested properly on the 3825. Good luck having it working.

If you want better bandwitdh utilization and no problems, drop the ATM completely and use clear channel T1.

New Member

Re: ATM IMA Config

Took another stab at trying to get this to work last night and was not able to get the ATM interfaces to come up/up.  If I removed the ATM interface from the IMA group it did go up/up, so it appears to be that the framing, etc on the T1 is correct.  It appears to be failing in the startup of the IMA group and bouncing the T1s.  Here is what I was seeing on the router last night:

Battlement#sh controller atm1/0

Interface ATM1/0 is down

  Hardware is ATM T1

LANE client MAC address is 0019.e762.2080

  hwidb=0x6826FF18, ds=0x682BCE5C

  slot 1, unit 0, subunit 0

  rs8234 base 0x4A000000, slave base 0x4A000000

  rs8234 ds 0x682BCE5C

  SBDs - avail 2048, guaranteed 0, unguaranteed 2048, starved 0

Seg VCC SCH access timeout 0

Seg VCC table 4A00DD80, Shadow Seg VCC Table 682DB094, VCD Table 682F10C8

Schedule table 4A018D80, Shadow Schedule table 682F80FC, Size C7E

RSM VCC Table 4A080A00, Shadow RSM VCC Table 6833DEE4

VPI Index Table 4A03E580, VCI Index Table 4A040A00

Bucket2 Table 4A028780, Shadow Bucket2 Table 682FB328

MCR Limit Table 4A028B80, Shadow MCR Table 682FCF5C

ABR template 4A028D80, Shadow template 6649D294

RM Cell RS Queue 4A03EA00

Queue           TXQ Addr  Pos  StQ Addr  Pos

0  UBR CHN0     4A03AD80  0    2E2C9040  0

1  UBR CHN1     4A03B180  0    2E2C9840  0

2  UBR CHN2     4A03B580  0    2E2CA040  0

3  UBR CHN3     4A03B980  0    2E2CA840  0

4  VBR/ABR CHN0 4A03BD80  0    2E2CB040  0

5  VBR/ABR CHN1 4A03C180  0    2E2CB840  0

6  VBR/ABR CHN2 4A03C580  0    2E2CC040  0

7  VBR/ABR CHN3 4A03C980  0    2E2CC840  0

8  VBR-RT CHN0  4A03CD80  0    2E2CD040  0

9  VBR-RT CHN1  4A03D180  0    2E2CD840  0

10 VBR-RT CHN2  4A03D580  0    2E2CE040  0

11 VBR-RT CHN3  4A03D980  0    2E2CE840  0

12 SIG          4A03DD80  0    2E2CF040  0

13 VPD          4A03E180  0    2E2CF840  0

Queue           FBQ Addr  Pos RSQ Addr  Pos

0  OAM          4A08CA00  255  2E2D0080  0

1  UBR CHN0     4A08DA00  0    2E2D1080  0

2  UBR CHN1     4A08EA00  0    2E2D2080  0

3  UBR CHN2     4A08FA00  0    2E2D3080  0

4  UBR CHN3     4A090A00  0    2E2D4080  0

5  VBR/ABR CHN0 4A091A00  0    2E2D5080  0

6  VBR/ABR CHN1 4A092A00  0    2E2D6080  0

7  VBR/ABR CHN2 4A093A00  0    2E2D7080  0

8  VBR/ABR CHN3 4A094A00  0    2E2D8080  0

9  VBR-RT CHN0  4A095A00  0    2E2D9080  0

10 VBR-RT CHN1  4A096A00  0    2E2DA080  0

11 VBR-RT CHN2  4A097A00  0    2E2DB080  0

12 VBR-RT CHN3  4A098A00  0    2E2DC080  0

13 SIG          4A099A00  0    2E2DD080  0

SAR Scheduling channels:  -1 -1 -1 -1 -1 -1 -1 -1

Part of IMA group 0

Link 0 IMA Info:

   group index is 0

   Tx link id is 0, Tx link state is unusableNoGivenReason

   Rx link id is 99, Rx link state is unusableFailed

    Rx link failure status is lodsFailure,

    0 tx failures, 2 rx failures

Link 0 Framer Info:

    framing is ESF, line code is B8ZS, fdl is None

    cable-length is long, Rcv gain is 26db and Tx gain is 0db,

    clock src is line, payload-scrambling is disabled, no loopback

    line status is 0x1; or no alarm.

    port is active, link is available

    0 idle rx, 0 correctable hec rx, 0 uncorrectable hec rx

    543132 cells rx, 487804 cells tx, 2 rx fifo overrun.

Link (0):DS1 MIB DATA:

  Data in current interval (146 seconds elapsed):

     2 Line Code Violations, 2 Path Code Violations

     0 Slip Secs, 1 Fr Loss Secs, 1 Line Err Secs, 0 Degraded Mins

     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 11 Unavail Secs

SAR counter totals across all links and groups:

   0 cells output, 0 cells stripped

   0 cells input, 109784 cells discarded, 0 AAL5 frames discarded

   0 pci bus err, 0 dma fifo full err, 0 rsm parity err

   0 rsm syn err, 0 rsm/seg q full err, 0 rsm overflow err

   0 rsm CPI ignored rbds, 0 rsm CPI&PAD ignored rbds,

   0 rsm abort ignored rbds

   0 rsm unknown err ignored rbds, pdu_check flag 0x0, error flag 0x0

   0 hs q full err, 0 no free buff q err, 0 seg underflow err

   0 host seg stat q full err

Battlement#sh ima int atm1/ima0

Interface ATM1/IMA0 is down

        Group index is 51

        Ne state is startUp, failure status is startUpNe

        Active links bitmap 0x0

    IMA Group Current Configuration:

        Tx/Rx configured links bitmap 0x1F/0x1F

        Tx/Rx minimum required links 1/1

        Maximum allowed diff delay is 100ms, Tx frame length 128

        Ne Tx clock mode CTC, configured timing reference link ATM1/0

        Test pattern procedure is disabled

    IMA Group Current Counters (time elapsed 152 seconds):

        0 Ne Failures, 0 Fe Failures, 197 Unavail Secs

    IMA Group Total Counters (last 0 15 minute intervals):

        0 Ne Failures, 0 Fe Failures, 0 Unavail Secs

    IMA link Information:

        Link     Physical Status        NearEnd Rx Status      Test Status

        ----     ---------------        -----------------      -----------

        ATM1/0   down                   unusableFailed         disabled

        ATM1/1   down                   unusableFailed         disabled

        ATM1/2   down                   unusableFault          disabled

        ATM1/3   down                   unusableFault          disabled

        ATM1/4   down                   unusableFault          disabled

Battlement#sh ima int atm1/0

Interface ATM1/0 is down

        ifIndex 1, Group Index 51, Row Status is active

        Tx/Rx Lid 0/99, relative delay 0ms

        Ne Tx/Rx state unusableNoGivenReason/unusableFailed

        Fe Tx/Rx state notInGroup/notInGroup

        Ne Rx failure status is lodsFailure

        Fe Rx failure status is noFailure

        Rx test pattern 0x63, test procedure disabled

    IMA Link Current Counters (time elapsed 168 seconds):

        176 Ima Violations, 7 Oif Anomalies

        10 Ne Severely Err Secs, 0 Fe Severely Err Secs

        208 Ne Unavail Secs, 0 Fe Unavail Secs

        217 Ne Tx Unusable Secs, 217 Ne Rx Unusable Secs

        0 Fe Tx Unusable Secs, 0 Fe Rx Unusable Secs

        0 Ne Tx Failures, 2 Ne Rx Failures

        0 Fe Tx Failures, 0 Fe Rx Failures

    IMA Link Total Counters (last 0 15 minute intervals):

        0 Ima Violations, 0 Oif Anomalies

        0 Ne Severely Err Secs, 0 Fe Severely Err Secs

        0 Ne Unavail Secs, 0 Fe Unavail Secs

        0 Ne Tx Unusable Secs, 0 Ne Rx Unusable Secs

        0 Fe Tx Unusable Secs, 0 Fe Rx Unusable Secs

        0 Ne Tx Failures, 0 Ne Rx Failures

        0 Fe Tx Failures, 0 Fe Rx Failures

If anyone has any ideas on what I'm missing that would be great.

New Member

Re: ATM IMA Config

Just a quick update on this.  Worked on the issue some more tonight.  I am able to get this to work back to back between a Cisco 3640 and the Cisco 3825.  I was able to replicate the same issue with a Cisco 3640 onsite as well.  After speaking with Qwest who provides our circuits it seems almost like an IMA version mismatch.  I am still showing a los of delay on the NE, although one of the ATM links did come up for a few seconds after they changed the IMA version to 1.0.  Version was changed back to IMA 1.1 and I'm back with the same 5 links all in fault with a LODfailure.  I plan on talking to Qwest again tomorrow, but if anyone can think of a config change I can do on our end that would be great.  I don't see any mention of the IMA version so I assume it is on 1.0, where as the 2821 would be at 1.1.

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