01-02-2009 02:44 AM - edited 03-06-2019 03:13 AM
Hi all,
We have Cisco 7206V Router at our site.
sh ima int
ATM2/ima0 is up
ImaGroupState: NearEnd = operational, FarEnd = operational
ImaGroupFailureStatus = noFailure
IMA Group Current Configuration:
ImaGroupMinNumTxLinks = 1 ImaGroupMinNumRxLinks = 1
ImaGroupDiffDelayMax = 25 ImaGroupNeTxClkMode = common(ctc)
ImaGroupFrameLength = 128 ImaTestProcStatus = disabled
ImaGroupTestLink = 0 ImaGroupTestPattern = 0xFF
IMA Link Information:
Link Link Status Test Status
------ ---------------------------- --------------
ATM2/0 up disabled
ATM2/1 up disabled
ATM2/2 up disabled
ATM2/3 up disabled
ATM2/5 up disabled
ATM2/6 up disabled
All the 6 interfaces ATM2/0 to 6 i checked shows no errors.
sh int atm2/0
ATM2/0 is up, line protocol is up
Hardware is IMA PA
Description: FLR-IN01-att-MPLS-6xE1.IMA1-12.2M-9.5M
MTU 4470 bytes, BW 1920 Kbit, DLY 20000 usec,
reliability 255/255, txload 0/255, rxload 1/255
Encapsulation UNKNOWN, loopback not set
Encapsulation(s): AAL5
511 maximum active VCs, 0 current VCCs
VC Auto Creation Disabled.
VC idle disconnect time: 300 seconds
0 carrier transitions
Last input never, output never, output hang never
Last clearing of "show interface" counters 6w3d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
but when i check interface
ATM2/ima0 is up, line protocol is up
Hardware is IMA PA
Description: FLR-IN01-att-MPLS-6xE1.IMA-12.2M-9.5M
MTU 4470 bytes, sub MTU 4470, BW 12200 Kbit, DLY 20000 usec,
reliability 255/255, txload 23/255, rxload 26/255
Encapsulation ATM, loopback not set
Encapsulation(s): AAL5
3071 maximum active VCs, 1 current VCCs
VC Auto Creation Disabled.
VC idle disconnect time: 300 seconds
314 carrier transitions
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 6w3d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 29584
Queueing strategy: Per VC Queueing
5 minute input rate 1259000 bits/sec, 271 packets/sec
5 minute output rate 1119000 bits/sec, 301 packets/sec
1260178850 packets input, 1803621135 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 3 giants, 0 throttles
81019 input errors, 81016 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
1360427559 packets output, 848317208 bytes, 0 underruns
4294965640 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
i see errors.
my question is all Physical 6 E1 lines show no erros but ATM2/ima0 shows erros
so where are these erros?
thanks
01-02-2009 03:29 AM
Hello Mahesh,
ATM IMA as PPP multilink can fragment a PDU and send fragments inside AAL5 PDUs on the ATM member links.
If on the other side reassembly of IMA fragments fail you can have errors
in your case you have CRC errors
81019 input errors, 81016 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
see
http://www.cisco.com/en/US/tech/tk39/tk356/technologies_tech_note09186a00800943aa.shtml
Hope to help
Giuseppe
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