Inpurt frames errors on gigabit connection to provider.

jkeeffe · ‎07-17-2013

We have two ASR1006 routers, one at each remote site, connected into a provider's optical WAN network. The provider hands us a gigabit ethernet link at both ends.

Both the ASR1006s are running asr1000rp2-advipservicesk9.03.06.01.s.152-2.S1.bin. We are using EIGRP as the routing protocol. Here's the problem:

EIGRP doesn't form a neighbor relationship between the two remote routers. On one side, the router drops the EIGRP connection stating too many retransmissions. The other router gigabit interface reports input frame errors, which increase every couple of seconds. On that interface, I've replaced the fiber SFP and the fiber to the provider's switch but the errors continue. The provider put a loopback on his equipment toward our router interface and the frame errors stopped. The provider then removed that loopback and put a loopback toward our interface on his equipment on the other side of his optical WAN. The input frames errors started up again.

Is it looking like the frame errors are coming from the provider's equipment? Are frame errors link local? In other words, can a frame error be generated several hops away and be past through a network? I was under the impression that a frame error would not travel through several pieces of equipment, but would be dropped by the first downstream piece of hardware that receives the frame. But maybe I'm incorrect.

Thanks for any input.

brett.harding · ‎07-17-2013

Correct, the errors should be local and not passed through the network. What type of errors are you seeing? Can you post a show interface output?

jkeeffe · ‎07-17-2013

Here is the output of 'show interface' you requested. I did it again a couple seconds later to show the input frame errors increasing.

TSC-ASR1006-A#sh int g0/2/0

GigabitEthernet0/2/0 is up, line protocol is up

Hardware is SPA-2X1GE-V2, address is c464.13f2.7820 (bia c464.13f2.7820)

Description: To LLT-RT7604B-g2/0/1- Century Link ID:ETH1000-15143283

Internet address is xx.xx.xx.xx/30

MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

reliability 128/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive not supported

Full Duplex, 1000Mbps, link type is force-up, media type is ZX

output flow-control is on, input flow-control is on

ARP type: ARPA, ARP Timeout 04:00:00

Last input 1d19h, output 00:00:54, output hang never

Last clearing of "show interface" counters 8w1d

Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: Class-based queueing

Output queue: 0/40 (size/max)

30 second input rate 0 bits/sec, 0 packets/sec

30 second output rate 0 bits/sec, 0 packets/sec

452439794 packets input, 37589912464 bytes, 0 no buffer

Received 91 broadcasts (0 IP multicasts)

0 runts, 0 giants, 0 throttles

307192 input errors, 0 CRC, 307192 frame, 0 overrun, 0 ignored

0 watchdog, 3701 multicast, 0 pause input

256328 packets output, 35869710 bytes, 0 underruns

0 output errors, 0 collisions, 33 interface resets

0 unknown protocol drops

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 pause output

0 output buffer failures, 0 output buffers swapped out

TSC-ASR1006-A#sh int g0/2/0

GigabitEthernet0/2/0 is up, line protocol is up

Hardware is SPA-2X1GE-V2, address is c464.13f2.7820 (bia c464.13f2.7820)

Description: To LLT-RT7604B-g2/0/1- Century Link ID:ETH1000-15143283

Internet address is xx.xx.xx.xx/30

MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

reliability 128/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive not supported

Full Duplex, 1000Mbps, link type is force-up, media type is ZX

output flow-control is on, input flow-control is on

ARP type: ARPA, ARP Timeout 04:00:00

Last input 1d19h, output 00:00:10, output hang never

Last clearing of "show interface" counters 8w1d

Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: Class-based queueing

Output queue: 0/40 (size/max)

30 second input rate 0 bits/sec, 0 packets/sec

30 second output rate 0 bits/sec, 0 packets/sec

452439794 packets input, 37589912464 bytes, 0 no buffer

Received 91 broadcasts (0 IP multicasts)

0 runts, 0 giants, 0 throttles

307196 input errors, 0 CRC, 307196 frame, 0 overrun, 0 ignored

0 watchdog, 3701 multicast, 0 pause input

256331 packets output, 35870224 bytes, 0 underruns

0 output errors, 0 collisions, 33 interface resets

0 unknown protocol drops

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 pause output

0 output buffer failures, 0 output buffers swapped out

brett.harding · ‎07-17-2013

Please also post "show controller ethernet-controller GigabitEthernet0/2/0".

Are you using ZX GBICs? Keep in mind that the minimum link distance for ZX GBICs is 6.2 miles (10 km) with an 8-dB attenuator installed at each end of the link. Without attenuators, the minimum link distance is 24.9 miles (40 km).

jkeeffe · ‎07-17-2013

The ASR1006 doesn't have the command 'show controller ethernet-controller....'. I did find this command though:

TSC-ASR1006-A#sh platform hardware port 0/2/0 plim statistics

Interface 0/2/0

RX Low Priority

RX Drop Pkts 0 Bytes 0

RX Err Pkts 0 Bytes 0

TX Low Priority

TX Drop Pkts 0 Bytes 0

RX High Priority

RX Drop Pkts 0 Bytes 0

RX Err Pkts 0 Bytes 0

TX High Priority

TX Drop Pkts 0 Bytes 0

Also, here is the output of 'show hw-module subslot 0/2 transceiver 0 status':

TSC-ASR1006-A#sh hw-module subslot 0/2 transceiver 0 status

The Transceiver in slot 0 subslot 2 port 0 is enabled.

Module temperature = +19.617 C

Transceiver Tx supply voltage = 3173.0 mVolts

Transceiver Tx bias current = 8680 uAmps

Transceiver Tx power = 2.7 dBm

Transceiver Rx optical power = -14.0 dBm

Reading the specs for the ZX the RX light levels should fall between -23db and 0db, which it does in the above output.

I'll get with the carrier and make sure we have the correct transceiver, although we did change out the ZX with an LX earlier and were still getting frame errors.