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Cisco ISR 890 keeps WAN port Shutdown

amh4y0001
Level 3
Level 3

Hi,

I have Cisco ISR 890 series (System image file is "c800-universalk9-mz.SPA.154-3.M9.bin".).

I noticed recently that it started to "down" the interface GE8. GE8 is the WAN port and using DHCP.

 

I have checked the interface for the Admin Shutdown (did again no shut), changed cable etc, but same results. When I use this Ge8 cable to some other ports, I can see that interface get link (this means cable is not damaged).  Any thoughts ...? Below is the output of the Sh Interface GE8:

///////////////////////////////////////////////////////////////////////////////////////////////////////

GigabitEthernet8 is down, line protocol is down
Hardware is PQ3_TSEC, address is ???.69e6 (bia ????.????.69e6)
Internet address will be negotiated using DHCP
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, Auto Speed, media type is unknown media type
output flow-control is unsupported, input flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:02:25, output hang never
Last clearing of "show interface" counters never
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 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
1 packets output, 60 bytes, 0 underruns
0 output errors, 0 collisions, 2 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

///////////////////////////////////////////////////////////////////////////////////////////////////////

1 Accepted Solution

Accepted Solutions

did you try hard set half duplex speed 100 some ISPs still us that even though it can cause collisions

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18 Replies 18

Sergey Lisitsin
VIP Alumni
VIP Alumni

amh4y0001,

 

Can you please show the configuration of the port 8 and also tell us what it connects to.

Mark Malone
VIP Alumni
VIP Alumni
Hi
whats usually connected to it on WAN side is it a modem , have you checked that side , could be dropping off completely dropping your port same time or some ISP fault
Your side looks clean the interface itself

have you tried altering speed and duplex settings to hardcode in case its that , it maybe be failing on auto negotiate

Hi,

I have connected a PC to that cable (instead of the GE8) and amazingly I can get valid IP address and link was up as normal.

Strange thing is that when I tried with a different box (same model, ISR 890) but GE8 was remain down.

Any thoughts ?

Well,

You doesn't have a pyshical problem in this case. You can check speed and duplex on both sides.

Try set it as manually to test
speed 1000
duplex full

or
speed 100
duplex full

Regards
Jaderson Pessoa
*** Rate All Helpful Responses ***

Jaderson Pessoa
VIP Alumni
VIP Alumni
Hello,

it looks like a physical problem. Check if the ports working connected directly on laptop. If yes, check if there is a problem in port on other side that this cable is plugged.

Regards
Jaderson Pessoa
*** Rate All Helpful Responses ***

Hi,

 

Both sides worked well when connected with a PC.

Duplex was set to full, however, I have not checked it with auto or 1000, will check and update here (on Monday).

Thanks and have a nice weekend.

Hello,

 

on a side note, as far as I recall, GigabitEthernet8 is a combo port, so you have to configure the media type under the interface to
select whether you want to use the  RJ-45 copper Ethernet port or the SFP port. 

 

interface GigabitEthernet8

 media-type ?

Hi again,

 

When I change the duplex of Ge8 to "auto" from "full", the interface was up.

As soon as I change the duplex to full, the interface went down immediately.

While in "Auto" mode, duplex mismatch error messages are visible:

%CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet8 (not full duplex), with Some_OtherDevice_OnNetwork.

 

%PQ3_TSEC-5-LATECOLL: Gi8, Late collision

 

What may be the possible cause of this behavior?

Hello,

 

"When I change the duplex of Ge8 to "auto" from "full", the interface was up.

As soon as I change the duplex to full, the interface went down immediately.

While in "Auto" mode, duplex mismatch error messages are visible:

%CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet8 (not full duplex), with Some_OtherDevice_OnNetwork.

 

%PQ3_TSEC-5-LATECOLL: Gi8, Late collision"

 

What may be the possible cause of this behavior?

 

"Late collisions, on the other hand, are not normal and are usually the result of out of spec. cabling or a malfunctioning adapter. A late collision is defined as any collision that occurs after 512 bits of the frame have been transmitted. ... A minute amount of time later, a collision occurs."

I think that you have three possible problems.

1. The other side (your isp), has a manually configuration on their router.

2. You have a cable problem.

3. Your router has a problem in his port.

I suggest you in this case, contact your ISP first, after it, if their cant help you, contact the CISCO TAC for RMA process.

Regards,

Jaderson Pessoa
*** Rate All Helpful Responses ***

Try set it to half-duplex the ISP may be hard set at that there end

duplex-half
speed 100

Media Type is correct: Rj45

I have done the following so far:

1. Changed the physical box (but same model, Cisco ISR 890 series).

2.  Updated the IOS to c800-universalk9-mz.SPA.154-3.M9.bin.

3.  Changed the Ethernet cable.

All three modifications results the same.

 

ISP: I have another location where the same ISP /line is being used, which is working fine. Actually, this issue occurs now, before it was working well as well.

Further thoughts ...?

 

did you try hard set half duplex speed 100 some ISPs still us that even though it can cause collisions

Hello,

 

I have connected a PC to that cable (instead of the GE8) and amazingly I can get valid IP address and link was up as normal.

 

When you was try it, the cable used here, it is directly attached from your pc to ISP device or it pass through a patchpanel?

 

 

Jaderson Pessoa
*** Rate All Helpful Responses ***
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