10-07-2010 05:18 PM - edited 03-04-2019 10:01 AM
I need your help to know why in this tail I see drops when only I have 163kbps from 512kbps available
RR01TMC#sh policy-map inter Multilink1
Multilink1
Service-policy output: WAN
Class-map: Precedencia3 (match-any)
3893661 packets, 868957186 bytes
30 second offered rate 163000 bps, drop rate 5000 bps<<<<<<<<<
Match: ip precedence 3
3893661 packets, 868957186 bytes
30 second rate 163000 bps
police:
cir 512000 bps, bc 16000 bytes
conformed 3280533 packets, 783170180 bytes; actions:
transmit
exceeded 3338 packets, 4207244 bytes; actions:
drop
conformed 163000 bps, exceed 5000 bps<<<<<<<<<
Queueing
Strict Priority
Output Queue: Conversation 264
Bandwidth 25 (%)
Bandwidth 992 (kbps) Burst 24800 (Bytes)
(pkts matched/bytes matched) 315589/74044438
(total drops/bytes drops) 0/0
Class-map: class-default (match-any)
8806416 packets, 2809621499 bytes
30 second offered rate 825000 bps, drop rate 0 bps
Match: any
Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 256
(total queued/total drops/no-buffer drops) 10/219/0
RR01TMC#
policy-map WAN
class Precedencia3
priority percent 25
police cir 512000 bc 16000 be 16000
class class-default
fair-queue
queue-limit 96
!
Thanks,
Solved! Go to Solution.
10-08-2010 10:34 AM
As per your post,
The policy map LAN is given as input to the interface connecting the local lan.
But if we notice closely your access list CLASE3 contains a lot of lists which i feel is other than VoIP
for eg:
permit ip 172.24.65.0 0.0.0.255 any <<<<<<<<<< ??
permit ip host 172.30.7.1 host 172.24.80.1
permit ip 172.27.164.0 0.0.0.255 any <<<<<<<< ??
what are these ?
You are marking all the traffic in the CLASE3 access-list with an ip prec of 3 and strictly prioritizing them across the WAN.
I think this is the reason for drops.
To avoid drops you need to tweak or rewrite the class/policy maps again.
I would have added more classes based on the applications.
You need to know what all applications exists and how many VoIP users are there etc.
Would recommend you to give VoIP critical treatment (prec 5) and signalling, prec 3.
10-07-2010 05:32 PM
These stats are based on a 30 second average. 30 seconds is a long time. At some point during a 30 second interval the rate for this particular class exceeded 512K and was dropped. Over the entire 30 second interval the *average* was 163K. During the 30 second interval it exceeded 512K.
The priority queue was designed for VoIP. Are there other traffic types in this queue? If so, I suggest moving it to another queue as the priority queue was never meant to deal with the burstiness of typical data traffic.
Chris
10-08-2010 12:26 AM
Why do you do a priority percent and police together ?
Priority percent or LLQ would have an inbuilt policer and it looks like your police cir is lower than the 25% of the MLPPP bandwidth.
Would recommend to implement strict priority for the RTP and proper shape average for the other classes.
Try to exclude policing towards the WAN.
Hope to help,
10-08-2010 09:19 AM
without police also I have drops
RR01TMC-70008313#sh policy-map inter mul 1
Multilink1
Service-policy output: WAN
Class-map: Precedencia3 (match-any)
3699456 packets, 480498613 bytes
30 second offered rate 259000 bps, drop rate 8000 bps
Match: ip precedence 3
3699456 packets, 480498613 bytes
30 second rate 259000 bps
Queueing
Strict Priority
Output Queue: Conversation 264
Bandwidth 25 (%)
Bandwidth 992 (kbps) Burst 24800 (Bytes)
(pkts matched/bytes matched) 576176/108489549
(total drops/bytes drops) 314/448084
Class-map: class-default (match-any)
10599189 packets, 3537023189 bytes
30 second offered rate 1354000 bps, drop rate 0 bps
Match: any
Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 256
(total queued/total drops/no-buffer drops) 0/145/0
RR01TMC-70008313#
In this queue only I have VOIP traffic
class-map match-any DATOS-P3
match access-group name CLASE3
class-map match-any Precedencia3
match ip precedence 3
!
!
policy-map LAN
class DATOS-P3
set ip precedence 3
class class-default
set ip precedence 1
policy-map WAN
class Precedencia3
priority percent 25
police cir 512000 bc 16000 be 16000
conform-action transmit
exceed-action drop
class class-default
fair-queue
queue-limit 96
ip access-list extended CLASE3
permit ip any any precedence flash
permit tcp any any eq 2000
permit udp any any range 16384 32767
permit tcp any any eq 1720
permit tcp any eq 1720 any
permit tcp any any range 3230 3237
permit udp any any range 3230 3237
permit tcp any range 3230 3237 any
permit udp any range 3230 3237 any
permit udp any range 16384 32767 any
permit tcp any any eq 1719
permit udp any any eq 1719
permit tcp any eq 1719 any
permit udp any eq 1719 any
permit ip 172.24.65.0 0.0.0.255 any
permit ip host 172.30.7.1 host 172.24.80.1
permit ip 172.27.164.0 0.0.0.255 any
THANKS
10-08-2010 10:34 AM
As per your post,
The policy map LAN is given as input to the interface connecting the local lan.
But if we notice closely your access list CLASE3 contains a lot of lists which i feel is other than VoIP
for eg:
permit ip 172.24.65.0 0.0.0.255 any <<<<<<<<<< ??
permit ip host 172.30.7.1 host 172.24.80.1
permit ip 172.27.164.0 0.0.0.255 any <<<<<<<< ??
what are these ?
You are marking all the traffic in the CLASE3 access-list with an ip prec of 3 and strictly prioritizing them across the WAN.
I think this is the reason for drops.
To avoid drops you need to tweak or rewrite the class/policy maps again.
I would have added more classes based on the applications.
You need to know what all applications exists and how many VoIP users are there etc.
Would recommend you to give VoIP critical treatment (prec 5) and signalling, prec 3.
10-13-2010 08:30 AM
I Changed the Acl CLASE3 and with this I don´t see drops, I had bursty traffic , thanks to all for your help
10-09-2010 09:50 AM
Hi jprodrig01 ,
It seems your traffic is bursty type and it is not able to take advantage of setting of Cir, bc and be you set.
Think it like you have to chase 50km distance in one hour. If this is your target then it is not necessary that in first 15 mintutes with what speel you will run.
So if you run at speed of 5km in first 15 minutes then I can say your average speed in 5km/hour. Qos is logic is quite similar. if you want more flexibily in terms of variation then you need to expand time frame (like one hour instead of 15 minutes )
I suggest you to change Bc and Be value (like police 512000 64000 64000) and also remove priority percent 25 just to verify the drop rate.
Qos is kind of thing where you need to tune different parameter to meet your requirement.
hope this helps
Regards
Mahesh
10-13-2010 08:38 AM
I Changed the Acl CLASE3 and with this I don´t see drops, I had bursty traffic , thanks to all for your help
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