[c-nsp] Cisco Multilink PPP

[Neal R]

   The latest and greatest is almost always going to be a mistake unless
you're running Call Manager Express or something crazy like that.

  This is what is on four boxes that give me no grief, but they don't
have any PPP multilink bundles on them ...


IOS (tm) RSP Software (RSP-K4PV-M), Version 12.0(32)S1, RELEASE SOFTWARE
(fc1)
 
Troy Beisigl wrote:
> The syslogs showed nothing at the time of the VIP crash. Every time it does
> crash, nothing odd shows up in the syslogs. We do get a crashdump file on
> the bootflash every time this happens though.
>
> The version that we are running is only due to it being stable for so long.
> This just started to happen. We tried a 12.4(8) and that had all sorts of
> issues with packet loss.
>
> One thing I can tell you is that if you remove the multilink interface and
> serial interfaces for one bundle that is down and re-add them, the router
> will no longer show a route in the routing table for any of those
> interfaces. If I create a whole new multilink interface and put the same IP
> address in it that was in the non-working one, it will come up and work just
> fine. 
>
>
> Troy Beisigl
> Network Director
> I2B Networks, Inc
> 858-715-8500 X 1005
>
>
> -----Original Message-----
> From: Neal R [mailto:neal at lists.rauhauser.net] 
> Sent: Monday, June 25, 2007 4:54 PM
> To: Troy Beisigl; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Cisco Multilink PPP
>
>
>   What do the logs say? If you have a unix box handy stick it on the
> console and record the messages that come when the system crashes. Is
> there a reason for that specific code you are using?
>
>
> Troy Beisigl wrote:
>   
>> Hi,
>>
>>  
>>
>> We are having a problem with Multilink PPP on a 7507 RSP 8 with 4
>>     
> VIP2-50s.
>   
>> The RSP is running 256M and the VIPS are running 128M each. We are running
>> dCEF due to VoIP QoS needs and have 8 multilink interfaces. 7 of these
>> multilinks are 2 T1s and 1 is 4 T1s is size.
>>
>>  
>>
>> Our problem is that we seem to have the VIP in slot 4 crashing. We have
>> replaced the ram first on this and the problem went away for a week. We
>> replaced the whole VIP next and still have problems. When it crashes,
>> multilinks that have T1s on that VIP no longer will pass traffic unless we
>> do full reboot. 
>>
>>  
>>
>> VIP #4 has 7 interfaces that are in multilink bundles. It has 14
>>     
> interfaces
>   
>> that are running QoS  (policy map low latency queueing). We currently are
>> running IOS Version 12.3(15b).
>>
>>  
>>
>> Does anyone have any ideas as to what is causing this and what we can do
>>     
> to
>   
>> solve it? 
>>
>> Troy Beisigl
>> Network Director
>> I2B Networks, Inc
>> 858-715-8500 X 1005
>>
>>  
>>
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>>   
>>     
>
>
>