09-06-2002 03:17 AM - edited 03-02-2019 01:10 AM
Hi there,
We have been implementing distributed QOS in a 7507 with RSP4 and 128 MB of RAM. The VIPs are VIP2-40 with 32 MB of RAM.
The QOS has been implemented in subinterfaces of a HSSI. Encapsulation is frame relay and the CIR is 64Kb.
We have observed that putting even just one of the subinterfaces under heavy load, routing updates send throught it are lost and thus communication. Further investigation showed that VIP's CPU usage was 100% since heavy load started with QOS on place but was negligible without it.
Has anyone had problems like this? Does anyone have an idea of suggested HW requirements for distributed QOS?
Thank you very much in advance.
Pablo Izquierdo
09-07-2002 08:44 PM
Pablo,
Are you doing Distributed FRTS ? What type of queueing are you doing - CBWFQ ?
Take a look at this link to be sure you are doing Distributed FRTS:
http://www.cisco.com/warp/public/105/distribfrts.html
Can you post your policy-map and hssi interface and subinteface portion of your config. Also, a 'show ip route sum' and a 'show policy-map interface' for the hssi subinterface would be helpful.
The vip2-40 is the minimum suggested vip to run if you are doing Distributed QoS. And, 32 meg on the VIP may not be enough memory to download the entire CEF table and do Distributed QoS efficiently.
thanks,
Patrick
09-10-2002 06:39 AM
Hi Patrick,
Here is an extract of the configuration regarding QoS.
ip cef distributed
!
class-map match-any intranet
match access-group 150
match access-group 160
class-map match-any transac
match access-group 120
match access-group 140
!
policy-map cbwfq
class transac
priority percent 82
class intranet
bandwidth percent 6
policy-map oficinas
class class-default
shape average 64000 64000 0
service-policy cbwfq
!
interface Hssi0/1/0
no ip address
encapsulation frame-relay IETF
no ip mroute-cache
carrier-delay 20
serial restart_delay 0
frame-relay lmi-type q933a
interface Hssi0/1/0.777 point-to-point
ip address X.X.X.X 255.255.255.248
ip access-group 101 in
ip access-group 110 out
ip accounting access-violations
no ip mroute-cache
service-policy output oficinas
frame-relay interface-dlci 777
Here is also the output of the commands you asked for
* show ip route sum
IP routing table name is Default-IP-Routing-Table(0)
Route Source Networks Subnets Overhead Memory (bytes)
connected 3 155 15592 36012
static 184 12 33400 28224
ospf 109 6 335 21888 49104
Intra-area: 2 Inter-area: 0 External-1: 0 External-2: 339
NSSA External-1: 0 NSSA External-2: 0
rip 1 297 31584 42912
internal 70 81480
Total 264 799 102464 237732
* show policy-map interface hssi 0/1/0.777
Hssi0/1/0.777
Service-policy output: oficinas
queue stats for all priority classes:
queue size 0, queue limit 13
packets output 4904, packet drops 0
tail/random drops 0, no buffer drops 0, other drops 0
Class-map: class-default (match-any)
35014 packets, 3425360 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
queue size 0, queue limit 1
packets output 37498, packet drops 10
tail/random drops 10, no buffer drops 0, other drops 0
Shape: cir 64000, Bc 64000, Be 0
lower bound cir 0, adapt to fecn 0
output bytes 3915710, shape rate 0 bps
Service-policy : cbwfq
Class-map: transac (match-any)
4904 packets, 306880 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group 120
224 packets, 51736 bytes
5 minute rate 0 bps
Match: access-group 140
4680 packets, 255144 bytes
5 minute rate 0 bps
Priority: 82% (52 kbps), burst bytes 4470, b/w exceed drops: 0
Class-map: intranet (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group 150
0 packets, 0 bytes
5 minute rate 0 bps
Match: access-group 160
0 packets, 0 bytes
5 minute rate 0 bps
queue size 0, queue limit 2
packets output 0, packet drops 0
tail/random drops 0, no buffer drops 0, other drops 0
Bandwidth: 6%, kbps 3
Class-map: class-default (match-any)
30110 packets, 3118480 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
queue size 0, queue limit 2
packets output 32594, packet drops 10
tail/random drops 10, no buffer drops 0, other drops 0
I have asked some other people, and with a flow of 8 Mbps of voice packets, a VIP4-80's CPU rises to 100% utilization, but that flow is much bigger that our 64 kbps.
Do you think this is a HW issue or a SW, bug related, issue
Best regards and thank you very much.
Pablo
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