09-06-2012 12:25 PM - edited 03-07-2019 08:44 AM
Hi Everyone !!!
I need some help desperately.
I have a Cisco 7200 Series Router which is connected to a Cisco 3750 switch as following:-
Cisco 7200 [FASTETHERNET 0/1] (126.96.36.199)--------------------------------------(188.8.131.52) [FASTETHERNET 0/0] Cisco 3750
Everything was working fine for a couple of months. However the connection stopped working today suddenly without any reason. I don't know why (no logs generated, nothing on SNMP server)
The LINE and PROTOCOL on both router and switch are UP. There are no ERRORS or CRC counters.
Also I cannot even ping Cisco 7200 IP 184.108.40.206 from itself.
PROD_7200# ping 220.127.116.11
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 18.104.22.168, timeout is 2 seconds:
Success rate is 0 percent (0/5)
Any suggestions about what is the issue here and how to solve it ?
09-06-2012 12:56 PM
Have you tried to change the cable?
have u tried shut and no shut on both interface ?
just show the output:
sh int fa 0/1
09-06-2012 01:05 PM
could you please share "show interface" from both sides ? show ip arp 22.214.171.124 from the router side?
if possible please enable debug arp and try to ping and share the debug output as well.
09-06-2012 02:55 PM
Hi Guys !!!
I have tried changing the Cisco 7200 with another one but NVRAM wasn't big enough to load the full config of this router
Reloaded the main router a couple of times (no success).
Outputs from Cisco 7200........ I am getting similar output from 3750 nothing unusual:-
OUTPUT FOR show interface fa0/1
Fast Ethernet 0/1 is up, line protocol is up
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 10Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 4:00:00
Last input 00:00:01, output 00:00:06, 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 50231232 bits/sec, 239826 packets/sec
5 minute output rate 2032438 bits/sec, 143026 packets/sec
498528 packets input, 754771392 bytes
Received 4386 broadcasts, 0 runts, 0 giants, 0 throttles
46 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
238904 packets output, 348799846 bytes, 0 underruns
28 output errors, 0 collisions, 14 interface resets
0 babbles, 0 late collision, 0 deferred
8 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
OUTPUT FOR show ip arp 126.96.36.199
Protocol Address Age (min) Hardware Addr Type Interface
Internet 188.8.131.52 0 Incomplete ARPA
Also for debug arp I haven't got any reply message for arp request for 184.108.40.206 or vice versa on Cisco 3750. Only arp request messages on both devices.
But the one thing that is troubling me the most is that I can't ping the router 7200(FA0/1) from the router itself.
How is this happening when the interface line and protocol both are up..
It is a production router of my company and was working fine since it was deployed. Also the I don't have any issues with other interfaces of this router they are working fine and their connected devices too....
09-06-2012 03:08 PM
Half duplex 10 mbps means cable in the most of cases. Change it and if you did, just hardcore the speed:
Do this on both sides and let me know
Sent from Cisco Technical Support iPad App
09-12-2012 02:29 PM
Hi Guys !!!
Thanks for the helpful replies....
We figured out the issue, it was because of an ACL permit ip any any applied to a crypto-map,
All the traffic Input/Output was being encrypted for VPN because of which self ping was not working.
Anyways....after 18 hours of continous TSHOOT....We finally caught it.
Apologies for late reply.....got busy in recreating the issue on the LAB for documentation.
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