06-30-2014 06:45 AM - edited 03-07-2019 07:52 PM
I have a Cisco 881 which is to be connected to a vendors switch (also Cisco) every time I enable the interface the port comes up up then transitions to down down and the indication light on the 881 stays amber. My thought is that they have port security enabled on their end but I haven't gotten a clear answer from them.
here is the interface configuration
!
interface FastEthernet3
switchport access vlan 99
no ip address
no cdp enable
end
sh logging..
007323: Jun 30 13:23:29.479: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to up
007324: Jun 30 13:23:30.479: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet3, changed state to up
007325: Jun 30 13:23:32.199: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet3, changed state to down
007326: Jun 30 13:23:33.203: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to down
I have had our guy on site try a different patch cable between the 2 devices and different ports but it does the same thing.
sh int
FastEthernet3 is down, line protocol is down
Hardware is Fast Ethernet, address is 64e9.5019.4311 (bia 64e9.5019.4311)
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)
Auto-duplex, Auto-speed
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:18, output never, output hang never
Last clearing of "show interface" counters 00:45:06
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
194 packets input, 21122 bytes, 0 no buffer
Received 46 broadcasts (136 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
0 input packets with dribble condition detected
67 packets output, 12263 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
42 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
Any help would be appreciated. I'm not sure if there is a debug that would help here.
06-30-2014 06:52 AM
Is this a copper port?
Some providers set their side at full duplex. So, you may want to try to set the port to 100Mb full duplex on your side and test again.
HTH
06-30-2014 06:57 AM
Thanks for your reply,
Yes copper. I tired setting the interface to 100 full, still having the problem.
06-30-2014 06:57 AM
Hello
What mode does this port need to be in? - routed or switched?
res
Paul
06-30-2014 07:03 AM
Hi Paul,
It would be a switchport.
here is what the vendor sent me as far as their end
interface GigabitEthernet0/1
description CUST ROUTER
switchport access vlan 9
switchport mode access
end
The vlans are different, but that shouldn't be a problem, I think it would just trigger a VLAN mismatch.
06-30-2014 07:26 AM
Hello
Are these two devices physical connected to each other ?
So your 881 router is connecting a cisco vendors switch via what port?
Do you have SVI interface of the this router enabled - something like this?
int vlan 1
no shut
interface FastEthernet3
no switchport access vlan 99
res
Paul
06-30-2014 07:09 AM
Another thing I noticed is the interface comes up and goes back up about once a minute
007395: Jun 30 13:58:44.488: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to up
007396: Jun 30 13:58:46.536: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to down
007397: Jun 30 13:59:50.258: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to up
007398: Jun 30 13:59:52.302: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to down
007399: Jun 30 14:00:56.364: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to up
007400: Jun 30 14:00:58.408: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to down
007401: Jun 30 14:02:01.798: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to up
007402: Jun 30 14:02:03.850: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to down
007403: Jun 30 14:03:07.592: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to up
007404: Jun 30 14:03:09.636: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to down
007405: Jun 30 14:04:13.674: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to up
007406: Jun 30 14:04:15.718: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to down
007407: Jun 30 14:05:19.776: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to up
007408: Jun 30 14:05:21.824: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to down
007409: Jun 30 14:05:33.928: %SYS-5-CONFIG_I: Configured from console by access on vty0 (10.1.20.77)
007410: Jun 30 14:06:25.209: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to up
007411: Jun 30 14:06:27.258: %LINK-3-UPDOWN: Interface FastEthernet3, changed state to down
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