Re: Understanding QoS

How can I verify it there is indeed a congestion
happened?

DC1-3FL-RTR001#sh policy-map int g0/2 GigabitEthernet0/2
Class-map: class-default (match-any)
 drop rate 0000 bps

This would be the first queue to start dropping packets during congestion
event.

Marc Edwards
CCIE #38259

On Thu, Jun 27, 2013 at 4:47 PM, Cisco Fanatic <ebay_products_at_hotmail.com>wrote:

> Studying QoS and playing
> with it ... quick dummy questions ..
>
>
>
> Ok, I have
> this policy
>
>
>
> !
>
> policy-map
> QoS_Output_Policy
>
> class VoIP
>
> priority
> percent
> 35
>
> set ip dscp ef
>
> class Video
>
> priority percent
> 25
>
> set ip
> dscp af41
>
> class SIP
>
> bandwidth
> remaining percent 25
>
> set ip dscp af31
> class Data
>
> bandwidth
> remaining percent 15
>
> set ip dscp af21
>
> class
> class-default
>
> fair-queue
>
> set dscp default
>
> !
>
> !
>
> interface
> GigabitEthernet0/2
>
> duplex full
>
> speed 100
>
> service-policy
> output
> QoS_Output_Policy
>
> !
>
>
>
> * Is by default 75%
> (75MB) of 1 GB bandwidth is
> available for use?
>
> * I can't apply
> "max-reserved-bandwidth" to a gig
> interface. How can I use the total
> 1GB bandwidth?
>
> * "priority percent
> 35"
> means LLQ and VoIP class gets 26MB (75MB * 35%)?
>
> * "bandwidth
> remaining
> percent 25" SIP traffic gets 12MB (75MB - 26MB = 46MB * 25% =
> 12MB)?
>
> * How
> can I verify it
> there is indeed a congestion happened?
>
>
>
> DC1-3FL-RTR001#sh
> policy-map int g0/2
>
> GigabitEthernet0/2
>
>
>
> Service-policy
> output:
> QoS_Output_Policy
>
>
>
> queue stats
> for all priority classes:
> Queueing
>
>
> queue limit 64 packets
>
>
> (queue depth/total
> drops/no-buffer drops) 0/0/0
>
>
> (pkts output/bytes output)
> 60579572/8599620493
>
>
>
> Class-map:
> VoIP (match-any)
>
>
> 58813111
> packets, 8056468225 bytes
>
> 5
> minute offered rate 0000 bps, drop rate
> 0000 bps
>
>
> Match: ip dscp ef (46)
>
>
> 1167959 packets, 86399962
> bytes
>
>
> 5 minute rate 0 bps
>
>
> Match: protocol rtp audio
> 57632956 packets, 7968100335 bytes
>
>
> 5 minute rate 0 bps
>
>
> Match:
> protocol rtcp
>
>
> 12196 packets, 1967928 bytes
>
>
> 5 minute rate 0
> bps
>
>
> Priority: 35% (35000 kbps), burst bytes 875000, b/w exceed drops: 0
> QoS
> Set
>
>
> dscp ef
>
>
> Packets marked 58813111
>
>
>
> Class-map:
> Video (match-any)
>
>
> 1766463 packets, 543152268 bytes
>
> 5
> minute
> offered rate 0000 bps, drop rate 0000 bps
>
>
> Match: ip dscp af41 (34)
> 1653227 packets, 526896986 bytes
>
>
> 5 minute rate 0 bps
>
>
> Match:
> protocol rtp video
>
>
> 0 packets, 0 bytes
>
>
> 5 minute rate 0 bps
> Match: protocol video-over-http
>
>
> 0 packets, 0 bytes
>
>
> 5 minute
> rate 0 bps
>
>
> Match: access-group name video
>
>
> 113236 packets,
> 16255282 bytes
>
>
> 5 minute rate 0 bps
>
>
> Priority: 25% (25000 kbps),
> burst bytes 625000, b/w exceed drops: 0
>
>
>
> QoS
> Set
>
>
> dscp af41
> Packets marked 1766463
>
>
>
> Class-map:
> SIP (match-any)
>
>
> 1125626
> packets, 314867881 bytes
>
> 5
> minute offered rate 6000 bps, drop rate 0000
> bps
>
>
> Match: ip dscp af31 (26)
>
>
> 572572 packets, 98559349 bytes
> 5 minute rate 3000 bps
>
>
> Match: protocol sip
>
>
> 553043 packets,
> 216307750 bytes
>
>
> 5 minute rate 3000 bps
>
>
> Match: ip dscp cs3 (24)
> af31 (26)
>
>
> 11 packets, 782 bytes
>
>
> 5 minute rate 0 bps
> Queueing
>
>
> queue limit 64 packets
>
>
> (queue depth/total
> drops/no-buffer drops) 0/0/0
>
>
> (pkts output/bytes output)
> 1125626/314867881
>
>
> bandwidth remaining 25%
>
> QoS
> Set
>
>
> dscp
> af31
>
>
> Packets marked 1125626
>
>
>
> Class-map:
> Data (match-any)
> 0
> packets, 0 bytes
>
> 5
> minute offered rate 0000 bps, drop rate 0000 bps
> Match: ip dscp af21 (18)
>
>
> 0 packets, 0 bytes
>
>
> 5 minute rate 0
> bps
>
>
> Queueing
>
>
> queue limit 64 packets
>
>
> (queue depth/total
> drops/no-buffer drops) 0/0/0
>
>
> (pkts output/bytes output) 0/0
> bandwidth remaining 15%
>
> QoS
> Set
>
>
> dscp af21
>
>
> Packets
> marked 0
>
>
>
> Class-map:
> class-default (match-any)
>
>
> 791611850
> packets, 912546925544 bytes
>
> 5
> minute offered rate 16514000 bps, drop
> rate 0000 bps
>
>
> Match: any
>
>
> Queueing
>
>
> queue limit 64 packets
> (queue depth/total drops/no-buffer drops/flowdrops) 0/5/0/5
>
>
> (pkts
> output/bytes output) 791611623/912502991512
>
>
> Fair-queue: per-flow queue
> limit 16 packets
>
> QoS
> Set
>
>
> dscp default
>
>
> Packets
> marked 791481954
>
>
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Received on Thu Jun 27 2013 - 18:13:20 ART