02-13-2008 06:38 AM - edited 03-03-2019 08:41 PM
HI,
I have a router connected to an ISP over a serial interface using HDLC protocol.
Every day the traffic stop going to ISP then i reboot the router and the traffic work again.
I have tried to clear arp cache but it did not get back, only if i reboot it works, I have tried 3 different 1800 routes with 3 diferent IOSs.
All of the routers shows the same problem.
Thanks
02-13-2008 08:35 AM
Guilherme
ARP is used by Ethernet (and FastEthernet, etc) interfaces. For your serial connection there is no ARP since it uses HDLC and HDLC has no ARP function.
The symptom of the router running for a while, then stopping forwarding traffic, and working again after a reboot sounds a bit like there was a memory leak. But if you have tried 3 different versions of IOS it seems a bit unlikely that the 3 different versions would all have the memory leak.
At the time when the router stops forwarding traffic can you log in to the router? Are there any messages in the log which might help explain why it stopped forwarding traffic? Can you do a show interface when the router is not forwarding and post the output? This might help us to figure what the problem is.
HTH
Rick
02-13-2008 09:18 AM
As Rick pointed out - this really sounds like a memory issue. Are you logging messages to a syslog server? I would recommend doing that right away. And if I was in your position, I would open a TAC case on this.
02-13-2008 11:47 AM
I said it wrong, it's not a serial interface, it's a ethernet link.
However i had no logg, I enabled it and will see if there is anything helpfull when it stops.
02-13-2008 12:18 PM
If you are able to log in when the router stops routing
do a couple of commands:
sh ip int brief
sh proc
sh mem
sh ver
There are a few things that we could see what the problem might be and rule out some other possibilities too.
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