[c-nsp] Transmit Discards Across MLPPP

[Rodney Dunn]

On a Cisco bundle we do QOS before putting the MLPPP headers on.
That prevents a lot of out of orders if you do QOS after putting
the MLP headers on.

So what you are seeing sounds correct.

You are most likely bursting above the bundle rate coming from
your LAN going towards the bundle so the QOS kicks in, prioritizes the
traffic, and drops the lower priority.

Rodney


On Tue, Aug 19, 2008 at 10:12:50AM -0500, Jeffrey Wojciechowski wrote:
> Hi All:
> 
> I am new to this forum so not sure if this is a good place to ask this question.
> 
> Whats the best way to troubleshoot transmit discards across MLPPP?
> 
> Here is my setup and symptoms:
> 
> -Cisco 2821 with 3x VWIC1-1MFT making up the multilink @ 1536 bandwidth (IPBASE image)
> -I am polling that router via SNMP with Solarwinds Orion @ 1 min intervals
> -today bandwidth (Sending) across multilink max of 2.05mbps
> -95th percentile on sending utilization is 33.74%
> -today dropped packets so far 1,418
> -show policy-map interface shows no drops in the ef queue (for our voip) so all drops are falling thru to our class-default which is using flow based fair queuing
> -drops only show @ multilink interface (sh int multilink123) not at the T1 interface level (sh int s0/2/0:0, sh int s0/2/1:0 and sh int s0/1/0:0)
> -I dont show any lost fragments (sh int multilink ppp) nor does the provider on the other end of this circuit)
> 
> My understanding is that the router should only be discarding if the sending interface is congested but its no. I am concerned about thsese drops while the utilization is fairly low. Drops do increase as traffic increases on the link.
> 
> Any guidence/advice would be very much appreicated.
> 
> If this has been asked and answered in another thread, please point me in the right direction.
> 
> Thanks!
> 
> Jeff Wojciechowski
> 
> 
> _________________________________________________________________
> Get thousands of games on your PC, your mobile phone, and the web with Windows?.
> http://clk.atdmt.com/MRT/go/108588800/direct/01/
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/