SDH Fiber Problem

jacob miller mmzinyi at yahoo.com
Mon Sep 19 04:20:06 CDT 2011


I have triend to do a ping with the DF bit set.
Maximum am able to get to is 1600.
This am guessing is because of the fact I have set the mtu size on My interface to 1600.

I have also enable all alarms on the node and am getting the following alarm which is registering as beign Minor.

"High Order Path Signal Label Mismatch"

Regards,
jacob Miller



----- Original Message -----
From: Leigh Porter <leigh.porter at ukbroadband.com>
To: jacob miller <mmzinyi at yahoo.com>
Cc: "nanog at nanog.org" <nanog at nanog.org>
Sent: Monday, September 19, 2011 11:17 AM
Subject: Re: SDH Fiber Problem

It does sound like an MTU issue. Symptoms are typical. Did you try pings end to end with DF bit set and full size datagrams?



-- 
Leigh Porter


On 19 Sep 2011, at 09:15, "jacob miller" <mmzinyi at yahoo.com> wrote:

> By meanigful traffic I mean traffic like Http traffic
> 
> Am able to ssh no problem.
> 
> Most of the clients on the link are using it for browsing.
> However we find that even though they are able to resolve and ping different sites.
> When it comes to opening of the page we have the page reading as opening opening .. but the page never gets opened.
> 
> Regards,
> Jacob Miller
> 
> 
> 
> ----- Original Message -----
> From: Leigh Porter <leigh.porter at ukbroadband.com>
> To: jacob miller <mmzinyi at yahoo.com>
> Cc: "nanog at nanog.org" <nanog at nanog.org>
> Sent: Monday, September 19, 2011 11:10 AM
> Subject: Re: SDH Fiber Problem
> 
> What exactly do you mean by meaningful traffic? ICMP from port to port works, can you pass TCP? SSH between routers? Establish a TCP session over it?
> 
> Are you using Juniper SRXs ? :-)
> 
> -- 
> Leigh Porter
> 
> 
> On 19 Sep 2011, at 08:24, "jacob miller" <mmzinyi at yahoo.com> wrote:
> 
>> I have tried the pings and am able to ping through with a size of 1600 with the df-bit set
>> 
>> without the df-bit am able to get up to 9000.
>> 
>> The switched on bot ends hav been set to allow jumbo frames through and the system MTU size and routing MTU sizes are at 1998.
>> The switch is a 2960 Cisco switch.
>> 
>> I have set the mtu on the interface on the end router to 1600 and still unable to push meaningful traffic.
>> 
>> Regards,
>> jacob Miller
>> 
>> 
>> 
>> ----- Original Message -----
>> From: Randy Bush <randy at psg.com>
>> To: jacob miller <mmzinyi at yahoo.com>
>> Cc: "nanog at nanog.org" <nanog at nanog.org>
>> Sent: Monday, September 19, 2011 9:55 AM
>> Subject: Re: SDH Fiber Problem
>> 
>>> I can ping on point to point
>>> I have BGP up and running
>>> When I try to pass traffic over the link my clients are unable to pass
>>> any meanigful traffic asn browsing is impossible.
>> 
>> mtu?  try various size pings.
>> 
>> filters?
>> 
>> randy
>> 
>> 
>> 
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