05-13-2010 12:58 PM - edited 03-04-2019 08:28 AM
Q:
cannot ping direct connection interface. "show cdp" can see the nei up. What steps can be taken to troubleshoot the issue.
configuration on interface:
!
interface GigabitEthernet0/0
ip address 1.1.1.1 255.255.255.252
no ip redirects
no ip directed-broadcast
no ip proxy-arp
load-interval 30
no snmp trap link-status
end
thanks.
05-13-2010 07:36 PM
kindly post your show cdp neighbor and ping results. either IP address on the remote end is incorrect or there's an ACL on it.
05-13-2010 09:28 PM
have you tried doing a tracert to the IP of that interface? Perhaps there is some time of GW issue that is overlooked. Please post trace route log.
Thank you
05-14-2010 06:15 AM
configuration of other end;
xxx#show run int g2/0
Building configuration...
Current configuration : 237 bytes
!
interface GigabitEthernet2/0
mtu 4470
ip address 1.1.1.2 255.255.255.252
no ip redirects
no ip directed-broadcast
no ip proxy-arp
load-interval 30
no snmp trap link-status
end
#ping 1.1.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
#traceroute 1.1.1.2
Type escape sequence to abort.
Tracing the route to 1.1.1.2
1 * * *
2 * * *
3 * * *
...
#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 1.1.1.1 - 0005.dd32.6000 ARPA GigabitEthernet0/0
Internet 1.1.1.2 45 0005.5f1e.68cc ARPA GigabitEthernet0/0
#show cdp nei
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
xxxxxx Gig 0/0 147 R 12410/PRP Gig 2/0
#show int g0/0
GigabitEthernet0/0 is up, line protocol is up
Hardware is GigMac 1 Port 10 GigabitEthernet Plus, address is 0005.dd32.6000 (bia 0005.dd32.6000)
Internet address is 1.1.1.1/30
MTU 4470 bytes, BW 10000000 Kbit, DLY 10 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 10000Mbps, link type is force-up, media type is LR 1310nm
......
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
29 packets input, 11339 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 29 multicast, 0 pause input
233 packets output, 34595 bytes, 0 underruns
Transmitted 0 broadcasts
0 output errors, 0 collisions, 0 interface resets
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
05-14-2010 07:39 AM
Hi,
debug ip packet details 101
access-list 101 permit icmp host 1.1.1.1 host 1.1.1.2
Check debug output... by the way just curious to know whether both interfaces are 10G ?
Regards
Hitesh Vinzoda
05-15-2010 12:58 AM
HI Amy,
Looking at the config and other output, we can see that we are learning arp of the IP address which you are trying to ping.
Which forces me to belive that their might be ACL on the remote end (which you are trying to ping).
Another thing which i have noticed is there is no traffic following though your Gi0/0.
I would suggest debug icmp on both sides and see whats it comes..
-Regards,
Smitesh
05-15-2010 10:39 PM
May 16 01:15:24 EDT: IP: tableid=0, s=1.1.1.2 (local), d=1.1.1.1 (GigabitEthernet2/0), routed via FIB
May 16 01:15:24 EDT: IP: s=1.1.1.2 (local), d=1.1.1.1 (GigabitEthernet2/0), len 100, sending
May 16 01:15:24 EDT: ICMP type=8, code=0.
May 16 01:15:54 EDT: IP: tableid=0, s=1.1.1.2 (local), d=1.1.1.1 (GigabitEthernet2/0), routed via FIB
May 16 01:15:54 EDT: IP: s=1.1.1.2 (local), d=1.1.1.1 (GigabitEthernet2/0), len 100, sending
May 16 01:15:54 EDT: ICMP type=8, code=0.
May 16 01:16:24 EDT: IP: tableid=0, s=1.1.1.2 (local), d=1.1.1.1 (GigabitEthernet2/0), routed via FIB
May 16 01:16:24 EDT: IP: s=1.1.1.2 (local), d=1.1.1.1 (GigabitEthernet2/0), len 100, sending
May 16 01:16:24 EDT: ICMP type=8, code=0.
May 16 01:16:54 EDT: IP: tableid=0, s=1.1.1.2 (local), d=1.1.1.1 (GigabitEthernet2/0), routed via FIB
May 16 01:16:54 EDT: IP: s=1.1.1.2 (local), d=1.1.1.1 (GigabitEthernet2/0), len 100, sending
May 16 01:16:54 EDT: ICMP type=8, code=0.
May 16 01:17:24 EDT: IP: tableid=0, s=1.1.1.2 (local), d=1.1.1.1 (GigabitEthernet2/0), routed via FIB
May 16 01:17:24 EDT: IP: s=1.1.1.2 (local), d=1.1.1.1 (GigabitEthernet2/0), len 100, sending
May 16 01:17:24 EDT: ICMP type=8, code=0
===remote end====
May 16 01:21:20 EDT: IP: tableid=0, s=1.1.1.1 (local), d=1.1.1.2 (GigabitEthernet0/0), routed via FIB
May 16 01:21:20 EDT: IP: s=1.1.1.1 (local), d=1.1.1.2 (GigabitEthernet0/0), len 100, sending
May 16 01:21:20 EDT: ICMP type=8, code=0.
May 16 01:21:22 EDT: IP: tableid=0, s=1.1.1.1 (local), d=1.1.1.2 (GigabitEthernet0/0), routed via FIB
May 16 01:21:22 EDT: IP: s=1.1.1.1 (local), d=1.1.1.2 (GigabitEthernet0/0), len 100, sending
May 16 01:21:22 EDT: ICMP type=8, code=0.
May 16 01:21:24 EDT: IP: tableid=0, s=1.1.1.1 (local), d=1.1.1.2 (GigabitEthernet0/0), routed via FIB
May 16 01:21:24 EDT: IP: s=1.1.1.1 (local), d=1.1.1.2 (GigabitEthernet0/0), len 100, sending
May 16 01:21:24 EDT: ICMP type=8, code=0.
May 16 01:21:26 EDT: IP: tableid=0, s=1.1.1.1 (local), d=1.1.1.2 (GigabitEthernet0/0), routed via FIB
May 16 01:21:26 EDT: IP: s=1.1.1.1 (local), d=1.1.1.2 (GigabitEthernet0/0), len 100, sending
May 16 01:21:26 EDT: ICMP type=8, code=0.
May 16 01:21:28 EDT: IP: tableid=0, s=1.1.1.1 (local), d=1.1.1.2 (GigabitEthernet0/0), routed via FIB
May 16 01:21:28 EDT: IP: s=1.1.1.1 (local), d=1.1.1.2 (GigabitEthernet0/0), len 100, sending
May 16 01:21:28 EDT: ICMP type=8, code=0.
From debugging on both ends, I saw sending packets, but not receiving any echo. Are you able to see anything usual from above icmp debug?
I don't see any ACL. It's new link. There is no traffic flowing through.
Really appreciate your kind help.
Amy
05-16-2010 06:32 AM
Hi Amy,
Is this a new Wan link? And how do the both routers connecting to each other?
Any ways to setup only the IP addresses on another Gigabit Ethernet for the router and the remote router?
Thanks,
KA
05-16-2010 06:44 AM
Other than knowing what link both routers connected to, Can you change your IP addresses to other than 1.1.1.1 and .2 /30 for the Routers WAN IP addresses?
Thanks,
05-17-2010 10:25 AM
I 've changed ip address to other private 10.x , also try public address. Not work.
Both ends are 10g.
Btw, I 've opend a cisco tac case for assistance.
I am really appreciate your kind help.
Regards,
05-17-2010 11:28 AM
Amy,
Try to take off the mtu config on g2/0. Also, what happens if you ping the other side by sourcing manually?
ping 1.1.1.1 sour GigabitEthernet2/0
HTH,
John
05-18-2010 12:13 PM
Two things I would suggest here, hopefully this will help:
- try doing a shut and no shut on both the interfaces. Don't no if you did that during the configuration process of the interfaces
- try setting the interfaces to auto-negotation on both sides of the interfaces (not saying this is a duplex issues because it probably would have displayed that in the output of the sho int, but may be worth try
Ultimately would be great to see both sides of the configuration for the interfaces.
05-18-2010 12:32 PM
configuration on interface:
!
interface GigabitEthernet0/0
ip address 1.1.1.1 255.255.255.252
no ip redirects
no ip directed-broadcast
no ip proxy-arp
load-interval 30
no snmp trap link-status
end
interface GigabitEthernet2/0
MTU 4470 <-- Noticed there is MTU set here but not set on the above interface (I would try setting the MTU to 1500 on both sides in addition, if the other interface has a lower or no MTU set then the packet will get dropped)
ip address 1.1.1.2 255.255.255.252
no ip redirects
no ip directed-broadcast
no ip proxy-arp
load-interval 30
no snmp trap link-status
end
05-18-2010 01:53 AM
show us the whole config,both sides,please.
06-24-2011 03:34 PM
Use something like PingMaster so that you can adjust the ping variables in real-time and see where you start to get drops due to MTU. There are alot of programs with this name, but the free one at flagshipsoft.com is what I'm talking about.
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