I have a question about Low-latency queuing. The following is configured on my branch routers to handle VoIP traffic.
class-map match-all VOICE
match ip dscp ef
class-map match-any CALL-SETUP
match ip dscp af31
match ip dscp cs3
bandwidth percent 4
interface Serial0/0.105 point-to-point
ip address XXX.XXX.XXX.XXX XXX.XXX.XXX.XXX
no ip redirects
no ip unreachables
no ip proxy-arp
frame-relay interface-dlci XXX
crypto map OutsideInterface
map-class frame-relay BUR_TO_RCC
frame-relay cir 1544000
frame-relay bc 15440
frame-relay be 0
frame-relay mincir 1544000
service-policy output LLQ
Now how I understand it above, it says that any packet that matches a DSCP code of EF gets placed in the class/queue VOICE that has a guaranteed and reserved (or at least I thought) bandwidth of 256K.
The reason I say "I thought" above is because recently we backed up one of our servers at night and noticed that the transfer rate was maxed (1.5 Mbps). But if the bandwidth is supposed to be reserved for the VOICE class/queue, should my transfer rate have risen past 1.28 Mbps???
Please let me know if I am interpreting this incorrectly. Thanks much guys!!
The reason is very simple. In your case "priority 256" tells that it can reserve bandwidth up to 256k for ACTIVE voice traffic. If there is no voice traffic, then other classes can use it or if voice traffic for eg only using 128k, then other 128k can be used by other classes.And also please note that if voice traffic presents itself more than 256k, then that excess voice traffic will be dropped.
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