I have 4 T1's configured in an IMA bundle in a 7200 with an IMA PA card. I'm getting CRC errors on the IMA interface. The carrier tested each T1 individually and saw no errors. I also shut each T1 down individually and while each one was down, the errors continued to increment on the IMA interface. This tells me that no single T1 is causing the errors. What else could be causing these errors? Here are some outputs:
ROUTER>sh int atm4/ima0
ATM4/ima0 is up, line protocol is up
Hardware is IMA PA
MTU 4470 bytes, sub MTU 4470, BW 6093 Kbit, DLY 20000 usec,
reliability 255/255, txload 3/255, rxload 11/255
Encapsulation ATM, loopback not set
2047 maximum active VCs, 4 current VCCs
VC Auto Creation Disabled.
VC idle disconnect time: 300 seconds
0 carrier transitions
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:31:50
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Since ATM divides packets into cells to transmit them across the network, all cells need to be present at the other end in order to reassemble the IP packet. If even 1 cell is dropped by the carrier network, you'll see CRC errors on your interface.
This can be caused by other sites not conforming to the CIR the provider gave them, or the provider having misconfigured policing, or even a link problem somewhere in the provider network.
Testing the T1's alone wont help here, since that is only the connection between you and the ATM edge. More times than not CRC errors are from cells being dropped within the ATM cloud.
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