interface hold-queue, QoS question

Unanswered Question
Jan 11th, 2009
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If I have a serial interface configured per below, is the hold-queue doing anything?


My understanding is hold-queue is a fifo function and by applying the QoS policy aren't I using CBWFQ in the interface?


policy-map P-QoS

class VOICE

priority 256

set dscp ef

class DATA-Priority

bandwidth 128

set dscp af31

class class-default

set dscp default

fair-queue

random-detect



map-class frame-relay P-class

frame-relay cir 1536000

service-policy output P-QoS


interface Serial0/1/0

bandwidth 1536

no ip address

encapsulation frame-relay IETF

no fair-queue

frame-relay traffic-shaping

frame-relay lmi-type cisco

hold-queue 256 in

hold-queue 256 out

!

interface Serial0/1/0.400 point-to-point

ip address 1.2.1.54 255.255.255.252

ip nbar protocol-discovery

ip flow ingress

ip flow egress

frame-relay interface-dlci 400 IETF

class P-class

crypto map P_Crypt

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Giuseppe Larosa Sun, 01/11/2009 - 12:43
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Hello Richard,

hold-queues are used for process-switched traffic like routing protocols hellos and updates.


QoS applies to user traffic


It shouldn't be a problem.


Hope to help

Giuseppe


wilson_1234_2 Mon, 01/12/2009 - 08:37
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Is there any reason to change these parameters from the default?


Also on the interface is:


"no fair-queue"


If I have a qos policy aren't I using CBWFQ?


How would this be affecting the policy applied to the sub-interface?

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