From: Eric Poulin (epoulins@yahoo.com)
Date: Thu Jun 21 2007 - 20:28:33 ART
Tarun,
Thanks for the link. This is an excellent QoS reference. Since the TX-ring is for the
main interface, if you need to enable LFI on a subinterface to improve VoIP delay, would
you enable it as well on the other subinterface?
That brings up another question, since both subinterfaces are sharing the same TX-ring,
if one subinterface is doing priority queueing, is the other subinterface affected by
that?
Thanks,
Eric
--- Tarun Pahuja <pahujat@gmail.com> wrote:
> Eric,
> On all Point-to-Point Protocol (PPP) and Multilink PPP (MLP) links,
> TX-ring
> buffer size is automatically configured, and you cannot change these default
> buffer values.On Frame Relay links, the TX-ring is for the main interface,
> which all
> subinterfaces also use. The default TX-ring buffer size is 64 packets(Per
> Main T1 interface). You mightneed to change this setting when the
> subinterface is very small or there are many
> subinterfaces.
>
> http://www.ssuet.edu.pk/~amkhan/cisco/Cisco_IP_Telephony_QoS_Design_Guide.pdf
>
> HTH,
> Tarun Pahuja
> CCIE#7707(R&S,Security,Voice,SP,Storage),CCSI
>
>
> On 6/21/07, Eric Poulin <epoulins@yahoo.com> wrote:
> >
> > Hi GS,
> >
> > I have a frame-relay link with two point-to-point subinterfaces, s0/0.501
> > and s0/0.502,
> > and I need to reduce serialization delay for any packets to 10ms on
> > s0/0.501. I know I
> > can accomplish this by using FRTS and making sure the interval is 10ms and
> > also enabling
> > fragmentation to whatever byte size is 10ms, but should I enable it on
> > both
> > subinterfaces?
> >
> > From what I understand, there's a single Tx Ring per interface,
> > considering this, if
> > s0/0.502's interval is left to default (125ms) and is transmitting a 1500
> > byte packet,
> > s0/0.501 would have to wait for that packet to exit the Tx Ring before
> > being able to
> > transmit anything? In this case, s0/0.501 would not meet the requirements
> > of 10ms delay?
> > Is my theory right?
> >
> > Your feedback is greatly appreciated,
> >
> > Thanks,
> > Eric
> >
> >
> >
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