IMA Error

Unanswered Question
Mar 6th, 2008

From ima interface output, there is many Ne Failure errors keep increasing, in the meanwhile, I observe that the Tx cells shows negative figure (-806656510), the Rx cells is positive figure (655927588), may I know why it like this? Thank you!

USROUTER1#sh ima int atm0/ima0

Interface ATM0/IMA0 is up

Group index is 12

Ne state is operational, failure status is noFailure

IMA Group Current Configuration:

Tx/Rx minimum required links 1/1

Maximum allowed diff delay is 60ms, Tx frame length 128

Ne Tx clock mode ITC

Test pattern procedure is disabled

IMA Group Total Counters (time elapsed 1945321 seconds):

-806656510 Tx cells, 655927588 Rx cells

13146 Ne Failures, 5418 Fe Failures, 29317 Unavail Secs

IMA link Information:

Link Physical Status NearEnd Rx Status Test Status

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

ATM0/0 up active disabled

ATM0/1 up active disabled

USROUTER1#sh controll atm0/ima0

Interface ATM0/IMA0 is up

Hardware is ATM AIM IMA connected to AIM slot 1

hwidb=0x648A6F20, sardb=0x648ADB64

slot 0, unit 0, subunit 1

MXT5100 versions: Framework 0x3380, Utils 0x3380,

AAL5 0x3380, AAL2 0x3380, AAL1 0x3380,

IMA 0x3380, CS 0x3380, Frame 0x3380.

Current (mxt5100_t)sardb:

Ind_Q(0xFA94960), Ind_Q_idx(885), Ind_Q_size(30000)

Cmd_Q(0xFA8FB00), Cmd_Q_idx(863), Cmd_Q_size(20000)

Inpool(0xFA59080), Inpool_size(4096)

Outpool(0xFA5A0C0), Outpool_size(4096)

Localpool(0xFA60000), Localpool_size(256)

StorBlk(0xF8E5000), host_blk(0xF8E40C0), em_blk(0xF8E4180)

tx_buf_desc(0xFA88A80), tx_free_desc_idx (1023)

MXT5100 sub_channel_mode is disabled

MXT5100 number of buffers in Inpool: 1024, Outpool 0

FPGA revision 0x2070007

MXT5100 IMA Group Info:

Group Number (0), Group Port ID (0x1005)

Group Index (0), Group Open Status SUCCESS

VCs configured (1)

IMA group alarms: NONE

IMA Link(0) alarms: NONE

IMA Link(1) alarms: NONE

MXT5100 Channel Info:

Channel Info (0):

Chan_ID (0x1225), Open Status SUCCESS, VC(1)VPI/VCI(5/32),

Tx SBD(used/max 1/40) , Tx PDU(443288966), Tx PDU discard(0)

Tx SDU size err(0), Tx cell CLP0(103820077), Tx cell CLP1(0)

Rx PDU(489459862), Rx PDU discard(0), Rx SDU size err(785746)

Rx CRC err(10673345), Rx cell CLP0(-574383716), Rx cell CLP1(0)

Thank You,


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Paolo Bevilacqua Thu, 03/06/2008 - 06:00

That is classical case of signed counter overflow, nothing to worry about. If you upgrade IOS, chances are it will go away.

Hope this helps, please rate post if it does!

trinawong Thu, 03/06/2008 - 06:50

Thank you for your update.

From the output can see many errors when do 'show controller atm0/ima0', telco tested many times that informed layer1 is no problem, could you advise what could be the problem here. Thank you.

Channel Info (0):

Chan_ID (0x1225), Open Status SUCCESS, VC(1)VPI/VCI(1/100),

Tx SBD(used/max 3/40) , Tx PDU(11887897), Tx PDU discard(0)

Tx SDU size err(0), Tx cell CLP0(130838239), Tx cell CLP1(0)

Rx PDU(12754220), Rx PDU discard(0), Rx SDU size err(3)

Rx CRC err(79), Rx cell CLP0(214830840), Rx cell CLP1(0)



USROUTER1#sh run int atm0/ima0

Building configuration...

Current configuration : 216 bytes


interface ATM0/IMA0

mtu 1500

bandwidth 4096

no ip address

ip flow ingress

ip route-cache flow

carrier-delay msec 100

ima clock-mode independent

ima differential-delay-maximum 60

no atm ilmi-keepalive


USROUTER1#sh run int atm0/ima0.1

Building configuration...

Current configuration : 1027 bytes


interface ATM0/IMA0.1 point-to-point

bandwidth 2452

ip address X.X.X.X X.X.X.X

ip access-group CISCO-SECURITY in

rate-limit output access-group 178 8000 8000 8000 conform-action set-dscp-transmit 48 exceed-action set-dscp-transmit 48

rate-limit output access-group 179 8000 8000 8000 conform-action transmit exceed-action transmit

rate-limit output access-group 180 16000 8000 8000 conform-action set-dscp-transmit 16 exceed-action set-dscp-transmit 16

rate-limit output access-group 182 256000 32000 32000 conform-action set-dscp-transmit 26 exceed-action set-dscp-transmit 28

rate-limit output access-group 184 2048000 256000 256000 conform-action set-dscp-transmit 0 exceed-action set-dscp-transmit 0

ip mroute-cache

pvc 1/100

class-vc VcClass_0

vbr-nrt 3648 3648 1

oam-pvc manage

oam ais-rdi 15 3

encapsulation aal5snap

transmit-priority 3

max-reserved-bandwidth 100

service-policy output atm_output



USROUTER1#sh run int atm0/1/0

Building configuration...

Current configuration : 132 bytes


interface ATM0/1/0

mtu 1500

no ip address


ima-group 0

no atm ilmi-keepalive



USROUTER1#sh run int atm0/1/1

Building configuration...

Current configuration : 132 bytes


interface ATM0/1/1

mtu 1500

no ip address


ima-group 0

no atm ilmi-keepalive


Paolo Bevilacqua Thu, 03/06/2008 - 13:50

Which errors are referring to? if the crc, the percentage is negligible respect to the input counter.


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