Nexus 5500 qos drop priority
Hi
If I have two COS values within the same queue on a 5500 port can I set drop priority for them ? I am looking at setting in contract and out of contract data rates for some VMs, setting the COS value dependant on this and then getting the 5K to be more likely to drop out of contact data.
Its whjat I would do on a 6k or 7k with assigning different tail drop thresholds to different COS values in the same queue.
Thats what I kind of figured after reading all the docs. Makes it a bit of a pain as there really arent quite enough queues for what I want to do.
Viideo & Voice
Call SIgnnaling
Critical Data
Network Ctrl (ssh, VMware vmotion and ctrl etc)
Bulk Data
Best Efforts
Thats six and since we are using FCoE tehre are only 5 qos groups we can use ......
I am going to have to combine two of the above.
Similar Messages
-
Mix of Nexus 5500 & Catalyst 6500
Hi there,
Does Nexus 5500 series require a Nexus 7000 parent device? or it will be supported with Catalyst 6509?
If this is the scenario :
CAT6509 - Core Layer 3
CAT6509 - Distribution Layer 2/3
NX-5548 - Access Layer 2
And FYI, no VSS on Catalyst 6509.
Thanks in advance,
GerardHello Chad,
Cool thanks ... that is perfect. We're eventually moving towards NX at the Core and Distribs really soon. Yeah, that's what I've known with the Extenders requirement with parent 5k or 7k too ...
Gerard -
Nexus 5500 duplicate ICMP echo-replay
I am experiencing inconsistent echo-replay from devices connected via VPC to Nexus 5500s while pinging from the Nexus exec prompt.
In some cases I receive normal response when pinging from one Nexus, but no response when pinging from the other switch. In other instance I receive normal response to one Nexus, and duplicate replays to the other. It looks like a VPC related bug. NXOS is 5.1.3.N2.1
5501# ping 10.12.12.232
PING 10.12.12.232 (10.12.12.232): 56 data bytes
64 bytes from 10.12.12.232: icmp_seq=0 ttl=253 time=8.585 ms
64 bytes from 10.12.12.232: icmp_seq=0 ttl=254 time=9.227 ms (DUP!)
64 bytes from 10.12.12.232: icmp_seq=1 ttl=253 time=1.011 ms
64 bytes from 10.12.12.232: icmp_seq=2 ttl=253 time=8.097 ms
64 bytes from 10.12.12.232: icmp_seq=2 ttl=254 time=9.429 ms (DUP!)
64 bytes from 10.12.12.232: icmp_seq=3 ttl=253 time=18.195 ms
64 bytes from 10.12.12.232: icmp_seq=4 ttl=253 time=8.807 ms
5502# ping 10.12.12.232
PING 10.12.12.232 (10.12.12.232): 56 data bytes
64 bytes from 10.12.12.232: icmp_seq=0 ttl=254 time=0.985 ms
64 bytes from 10.12.12.232: icmp_seq=1 ttl=254 time=0.884 ms
64 bytes from 10.12.12.232: icmp_seq=2 ttl=254 time=0.875 ms
64 bytes from 10.12.12.232: icmp_seq=3 ttl=254 time=3.105 ms
64 bytes from 10.12.12.232: icmp_seq=4 ttl=254 time=8.378 ms
Thanks
JarekHi
I found this in the configuration guide for the Nexus 7000 configuring VPCs
"When you enable this feature (peer-gateway), Cisco NX-OS automatically disables IP redirects on all interface VLANs mapped over a vPC VLAN to avoid generation of IP redirect messages for packets switched through the peer gateway router."
However this is not happening automatically on the 5K, so you need to manually add "no ip redirects" on each VPC vlan interface to prevent duplicate pings. -
Connecting the nexus 5500 with multiple vsans
Hi,
it's my first experience in the fibre channel world and i have a few doubts about the best way to connect the nexus 5500 to a EMC storage.
This is my scenario
this is my configuration:
vsan database
vsan 2
vsan 2 interface fc 1/1
vsan 3
vsan 3 interface fc 1/2
interface fc1/1
switchport mode f
no shut
interface fc1/2
switchport mode f
no shut
now I don't know how can I connect the port fc1/3 to the vnx storage, I think I can't make a trunk like ethernet, can anyone help me?
Or i only can do this with zoning
Thanks
FredHello Fred,
All interfaces must be in the same vsan for them to see each other
vsan database
vsan 2 interface fc1/1, fc1/2, fc1/3
exit
Then you can zone each separately
example:
zone name host1 vsan 2
member pwwn 11:11:11:11:11:11:11:11 (host1 pwwn)
member pwwn 33:33:33:33:33:33:33:33 (VNX)
zone name host2 vsan 2
member pwwn 22:22:22:22:22:22:22:22 (host2 pwwn)
member pwwn 33:33:33:33:33:33:33:33 (VNX)
zoneset name Zoneset1 vsan 2
mem host1
mem host2
zoneset activate name Zoneset1 vsan 2
Thanks -
Uplink-ID 0 in Nexus 5500 with FEX 2248.
Hi all,
I've got 2 Nexus 5548 and a fex 2248 connected to both of them via a vPC. 1 Uplink port goes to N5K-01 e1/10 and a second Uplink port goes to N5K-02 to port e1/10.
On the log of the first Nexus 5500 I see this:
N5K-01 %FEX-5-FEX_PORT_STATUS_NOTI: Uplink-ID 0 of Fex 103 that is connected with Ethernet1/10 changed its status from Configured to Fabric Up
N5K-01 %FEX-5-FEX_PORT_STATUS_NOTI: Uplink-ID 1 of Fex 103 that is connected with Ethernet1/10 changed its status from Fabric Up to Connecting
N5K-01 1 %FEX-5-FEX_PORT_STATUS_NOTI: Uplink-ID 1 of Fex 103 that is connected with Ethernet1/10 changed its status from Connecting to Active
On the log of the second nexus 5500, I see this:
N5K-02 %FEX-5-FEX_PORT_STATUS_NOTI: Uplink-ID 0 of Fex 103 that is connected with Ethernet1/10 changed its status from Configured to Fabric Up
N5K-02 %FEX-5-FEX_PORT_STATUS_NOTI: Uplink-ID 2 of Fex 103 that is connected with Ethernet1/10 changed its status from Fabric Up to Connecting
N5K-02 %FEX-5-FEX_PORT_STATUS_NOTI: Uplink-ID 2 of Fex 103 that is connected with Ethernet1/10 changed its status from Connecting to Active
What is the difference between Uplink-ID 0, 1 and 2? If I only have 2 uplink ports, why is there a third one?
Thanks in advace for your assistance.Hi Sonu,
I see the similar problem on my nexus5ks. show cfs peer does not display the peer information. I have been waiting for hours now.
sw01# sh cfs peerCFS Discovery is in Progress ..Please waitCould not get response. The network topology may be under going change.Please try after about 30 seconds
Did you find the fix7workaround of this problem ?
Regards,
Umair -
Cannot InterVlan on Cisco Nexus 5500
Dear All,
I have problem with my nexus 5500,
Intervlan on my nexus not work,
i dont know why..
Before i have only this kind of license:
Feature Ins Lic Status Expiry Date Comments
Count
FCOE_NPV_PKG No - Unused -
FM_SERVER_PKG No - Unused -
ENTERPRISE_PKG Yes - Unused Never -
FC_FEATURES_PKG Yes - Unused Never -
VMFEX_FEATURE_PKG Yes - Unused Never -
ENHANCED_LAYER2_PKG No - Unused -
LAN_BASE_SERVICES_PKG No - Unused -
LAN_ENTERPRISE_SERVICES_PKG No - Unused -
and feature i used is :
- feature privilege
- feature telnet
- feature interface-vlan
- feature hsrp
- feature dhcp
- feature lldp
I make few vlan on nexus and then i check the interface status and the result is all vlan Interface is UP but intervlan is not work.
And then, i install license for LAN_BASE_SERVICES_PKG, this is result for install licensed:
Feature Ins Lic Status Expiry Date Comments
Count
FCOE_NPV_PKG No - Unused -
FM_SERVER_PKG No - Unused -
ENTERPRISE_PKG Yes - Unused Never -
FC_FEATURES_PKG Yes - Unused Never -
VMFEX_FEATURE_PKG Yes - Unused Never -
ENHANCED_LAYER2_PKG No - Unused -
LAN_BASE_SERVICES_PKG Yes - In use Never -
LAN_ENTERPRISE_SERVICES_PKG No - Unused -
I used vlan configuration vlan before, but the interface VLAN is DOWN/DOWN.
and then i read this article:
http://www.layerzero.nl/blog/2012/10/nexus-5000-non-routable-vdc-mode/
Yes, thats solution work for 1 Vlan with "management" command on interface VLAN.
But, the other vlan is still DOWN. and Intervlan is not work to.
Anyone, can help me please?
I have experience configure Nexus 5000 with VPC, FEX, Storage, etc, and everything fine without isue in intervlan.
Thanks.Marvin,
This is the output.
`show module`
Mod Ports Module-Type Model Status
1 48 O2 48X10GE/Modular Supervisor N5K-C5596UP-SUP active *
Mod Sw Hw World-Wide-Name(s) (WWN)
1 5.2(1)N1(1b) 1.0 --
`show interface brief`
Ethernet VLAN Type Mode Status Reason Speed Port
Interface Ch #
Eth1/1 1 eth trunk up none 10G(D) --
Eth1/2 1 eth trunk up none 10G(D) --
Eth1/3 1 eth trunk up none 10G(D) --
Eth1/4 1 eth trunk up none 10G(D) --
Eth1/5 1 eth trunk down Link not connected 10G(D) --
Eth1/6 1 eth trunk up none 10G(D) --
Eth1/7 1 eth trunk up none 10G(D) --
Eth1/8 1 eth trunk down Link not connected 10G(D) --
Eth1/9 1 eth access down SFP not inserted 10G(D) --
Eth1/10 1 eth access down SFP not inserted 10G(D) --
Eth1/11 1 eth access down SFP not inserted 10G(D) --
Eth1/12 1 eth access down SFP not inserted 10G(D) --
Eth1/13 1 eth access down SFP not inserted 10G(D) --
Eth1/14 1 eth access down SFP not inserted 10G(D) --
Eth1/15 1 eth access down SFP not inserted 10G(D) --
Eth1/16 1 eth access down SFP not inserted 10G(D) --
Eth1/17 1 eth access down SFP not inserted 10G(D) --
Eth1/18 1 eth access down SFP not inserted 10G(D) --
Eth1/19 1 eth access down SFP not inserted 10G(D) --
Eth1/20 1 eth access down SFP not inserted 10G(D) --
Eth1/21 1 eth access down SFP not inserted 10G(D) --
Eth1/22 1 eth access down SFP not inserted 10G(D) --
Eth1/23 1 eth access down SFP not inserted 10G(D) --
Eth1/24 1 eth access down SFP not inserted 10G(D) --
Eth1/25 1 eth access down SFP not inserted 10G(D) --
Eth1/26 1 eth access down SFP not inserted 10G(D) --
Eth1/27 1 eth access down SFP not inserted 10G(D) --
Eth1/28 1 eth access down SFP not inserted 10G(D) --
Eth1/29 1 eth access down SFP not inserted 10G(D) --
Eth1/30 1 eth access down SFP not inserted 10G(D) --
Eth1/31 1 eth access down SFP not inserted 10G(D) --
Eth1/32 1 eth access down SFP not inserted 10G(D) --
Eth1/33 1 eth access down SFP not inserted 10G(D) --
Eth1/34 1 eth access down SFP not inserted 10G(D) --
Eth1/35 1 eth access down SFP not inserted 10G(D) --
Eth1/36 1 eth access down SFP not inserted 10G(D) --
Eth1/37 1 eth access down SFP not inserted 10G(D) --
Eth1/38 1 eth access down SFP not inserted 10G(D) --
Eth1/39 1 eth access down SFP not inserted 10G(D) --
Eth1/40 1 eth access down SFP not inserted 10G(D) --
Eth1/41 1 eth access down SFP not inserted 10G(D) --
Eth1/42 1 eth access down SFP not inserted 10G(D) --
Eth1/43 1 eth access down SFP not inserted 10G(D) --
Eth1/44 1 eth access down SFP not inserted 10G(D) --
Eth1/45 1 eth access down SFP not inserted 10G(D) --
Eth1/46 1 eth access down SFP not inserted 10G(D) --
Eth1/47 1 eth trunk down SFP not inserted 10G(D) --
Eth1/48 1 eth trunk down SFP not inserted 10G(D) --
Port VRF Status IP Address Speed MTU
mgmt0 -- down -- -- 1500
Interface Secondary VLAN(Type) Status Reason
Vlan1 -- down Administratively down
Vlan199 -- up --
Vlan999 -- down Non-routable VDC mode
sh ip int bri
IP Interface Status for VRF "default"(1)
Interface IP Address Interface Status
Vlan199 192.168.36.10 protocol-up/link-up/admin-up
Vlan999 192.168.99.1 protocol-down/link-down/admin-up
sh vlan
VLAN Name Status Ports
1 default active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/9, Eth1/10, Eth1/11
Eth1/12, Eth1/13, Eth1/14
Eth1/15, Eth1/16, Eth1/17
Eth1/18, Eth1/19, Eth1/20
Eth1/21, Eth1/22, Eth1/23
Eth1/24, Eth1/25, Eth1/26
Eth1/27, Eth1/28, Eth1/29
Eth1/30, Eth1/31, Eth1/32
Eth1/33, Eth1/34, Eth1/35
Eth1/36, Eth1/37, Eth1/38
Eth1/39, Eth1/40, Eth1/41
Eth1/42, Eth1/43, Eth1/44
Eth1/45, Eth1/46, Eth1/47
Eth1/48
5 A active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/47, Eth1/48
199 B active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/47, Eth1/48
391 C active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/47, Eth1/48
392 D active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/47, Eth1/48
393 E active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/47, Eth1/48
394 F active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/47, Eth1/48
395 G active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/47, Eth1/48
500 H active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/47, Eth1/48
526 I active Eth1/1, Eth1/2, Eth1/3, Eth1/4
Eth1/5, Eth1/6, Eth1/7, Eth1/8
Eth1/47, Eth1/48
VLAN Type Vlan-mode
1 enet CE
5 enet CE
199 enet CE
391 enet CE
392 enet CE
393 enet CE
394 enet CE
395 enet CE
500 enet CE
526 enet CE
Remote SPAN VLANs
Primary Secondary Type Ports -
DCNM SAN 6.2 + Nexus 5500 not using interface mgmt
When trying to discover a newly setup fabric we have set the SVI of one of the Nexus 5500 switches as seed device in DCNM SAN server. Problem do seem to be the same in DCNM 6.2 as in DCNM 5.x, one can not use a SVI.... After adding the seed switch with the IP adress of the SVI it appears in the Admin->Data sources->Fabric with the ip address of the mgmt interface. Thing is that this ip address can not be reached from the DCNM SAN server since we have only used a cross over ethernet cable for peer-keepalive over the mgmt interfaces.
Is there a way in DCNM SAN 6.2 to force SAN management over a SVI instead of the mgmt interface?Here is the solution:
in the menubar on the top, in the lower one go to Admin > Server Properties
scroll to the middle of the list, locate “fabric.managementIpOverwrite” and set it to false
restart the DCNM Servers -
Hi,
If I use a SFP-10G-SR transceiver in a Nexus 5500, can I have FCoE in this port?
Sorry for the question but i'm begining in the FCoE world
ThanksThanks Vinayak
I'm very excited to be working with Nexus switches. Currently we only going to use ethernet, but with the new servers will be able to use FCoE. -
Nexus 5500 to Nexus 5500 Fiber Etherchannel with different lengths
Hi,
I'm in the very first phase of designing a small datacenter infrastructure based on the Nexus 5500 series. I haven't got any hands-on nexus experience yet so please forgive me if I'm asking a silly question here...
What I would like to build is a 4 unit, redundant datacenter design. Two units in one DC, and two units in the other. I would like to connect both DCs together using a redundant darkfiber. One link is 10 miles, the other is 20 miles.
The Nexus switches are going to be connected "back-to-back" with and the redundant etherchannel between the DCs, like this http://www.netcraftsmen.net/component/content/article/69-data-center/859-configuring-back-to-back-vpcs-on-cisco-nexus-switches.html
Can I expect any problems with this design? In particular with the different lengths of fiber, like buffering issues or failing transmissions?
Thanks!That should not be an issue. You will need single mode fiber and single mode optics, and as long as all your optics support distance of 20 miles or more, then you should be fine.
HTH -
Qos using priority queue drops
I have following config for Qos.
Basically Access-list match the voip/signalling traffic & put that in High queue. I am trying to figure without hight utilization why I am seeing output drops in high queue.
7206#sh int s5/1/5:0
Serial5/1/5:0 is up, line protocol is up
Hardware is PA-MC-2T3+
Description: T1
Internet address is 172.17.133.105/30
MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
reliability 255/255, txload 24/255, rxload 23/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input 00:00:06, output 00:00:00, output hang never
Last clearing of "show interface" counters 01:58:03
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1800
Queueing strategy: priority-list 4
Output queue (queue priority: size/max/drops):
high: 0/20/1764, medium: 0/20/0, normal: 0/15/36, low: 0/15/0
5 minute input rate 143000 bits/sec, 82 packets/sec
5 minute output rate 145000 bits/sec, 83 packets/sec
734269 packets input, 148368640 bytes, 0 no buffer
Received 708 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
734855 packets output, 148838576 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions no alarm present
Timeslot(s) Used: 1-24, subrate: 1536Kb/s, transmit delay is 0 flags
non-inverted data
==============================================================================
7200#sh run int s2/1/5:0
Building configuration...
Current configuration : 254 bytes
interface Serial2/1/5:0
description T1
ip address x.x.x.x
no ip redirects
no ip unreachables
no ip proxy-arp
no snmp trap link-status
priority-group 4
no cdp enable
end
====================================================================================
Define access-list to match voice/signalling traffic
access-list 140 permit udp any any range 1024 1151
access-list 140 permit udp any any range 16384 32767
access-list 140 permit udp any any eq 2427
access-list 140 permit udp any any eq 2429
access-list 140 permit udp any any eq 5060
priority-list 4 protocol ip high list 140
priority-list 4 queue-limit 20 20 15 15Hi,
your queue limit is 20 packets. This can explain the behaviour. If there are 20 packets in the queueing system waiting to be serviced any newly arriving packet will be dropped.
Basically you can have drops in any queue in any queueing system if there is a permanent overload situation. There is no magic trick, if you f.e. permanently send 2 Mbps voip towards a T1. There will be drops.
QoS does not create resources, it just distributes them among your important traffic classes.
Besides this I also would suggest you to use class based queueing based on Modular QoS CLI (MQC). It is more flexible and precise than the old legacy methods like priority queueing, which you are using. On the other hand, if this is sufficient for you, why not.
Regards, Martin -
Hi:
Can someone give me a QOS example config for my scenario below:
I have read the config guide and is confused.
Let's say I have a router leg on e1/1 of N5K1.
I want to limit on the outbound( N5K1 to router) http 25%, icmp 10K and remaining goes to default.
Any sample configurations welcome. I have already checked the ones in thc config guide.
thanksHello Ben,
Since you have not received a reply, I am moving this post to our data center community for greater visibility.
Thank you,
Fabienne -
Nexus 5500 VoIP cos 3 and FCoE
Hi
I have a requirment to do QoS for a DC that includes some VoIP as well FCoE with CNAs in the servers. I want to use COS 3 for the VoIP signalling and drop it in the same input and output quues to the servers as FCoE.
so we have
class-map type qos class-fcoe
class-map type queuing class-fcoe
match qos-group 1
which is the default for FCoE and I have 50% bandwidth assoicated with it.
policy-map type queuing
class type queuing class-fcoe
bandwidth percent 50
class type queing someother class etc
The issue is the "class-fcoe" is a default class and there doesnt seem to be anywhere I can edit it to add the VOIP control traffic to the same class or can I just add it here:
class-map type queuing match any class-fcoe
match qos-group 1
match cos 3
Thanks
PatHmm
From the UCS 8 SRND
For instance, voice signaling traffic with L3 DSCP value of CS3 is mapped to L2 CoS value of 3 by Nexus 1000V. All Fibre Channel over Ethernet (FCoE) traffic is marked with L2 CoS value of 3 by Cisco UCS. When voice signaling and FCoE traffic enter the Cisco UCS 6100 Fabric Interconnect Switch, both will carry a CoS value of 3. In this situation voice signaling traffic will share queues and scheduling with the Fibre Channel priority class and will be given lossless behavior. (Fibre Channel priority class for CoS 3 in the UCS 6100 Fabric Interconnect Switch does not imply that the class cannot be shared with other types of traffic.)
This seems ti pmply you can run Call SIgnalling COS 3 in the same queueu as FCOE COS 3. I kow its talking about a 6100 fabric switch but thats very similar to a 5500.
Could I not do something like:
class-map type qos match-all voice-signal-global
match-cos 3
policy-map type qos classify-global
class voice-signal-global
set qos-group 1
class class-fcoe
set qos-group 1
But then I cant see how to link this where we set the queuing bandwidth percentages as this uses the "class-fcoe"
policy-map type queuing global-fcoe-queuing-in
class type queuing class-fcoe
bandwidth percent 50
Could I create a class to replace "class-fcoe" and jsut match on qos-group 1 to define whats in it ?
Regards
Pat -
I have a problem with an interface Gi that it has qos enable. It drops packets in priority queue ( cos 5 asignated), following the q2 and there is not drops on q1.
This is the status:
Interface GigabitEthernet9/32 queueing strategy: Weighted Round-Robin
Port QoS is enabled
Trust state: trust COS
Extend trust state: not trusted [COS = 0]
Default COS is 0
Transmit queues [type = 1p2q2t]:
Queue Id Scheduling Num of thresholds
1 WRR low 2
2 WRR high 2
3 Priority 1
WRR bandwidth ratios: 100[queue 1] 255[queue 2]
queue-limit ratios: 70[queue 1] 15[queue 2]
queue random-detect-min-thresholds
1 40[1] 70[2]
2 40[1] 70[2]
queue random-detect-max-thresholds
1 70[1] 100[2]
2 70[1] 100[2]
queue thresh cos-map
1 1 0 1
1 2 2 3
2 1 4 6
2 2 7
3 1 5
Receive queues [type = 1q2t]:
Queue Id Scheduling Num of thresholds
1 Standard 2
queue tail-drop-thresholds
1 100[1] 100[2]
queue thresh cos-map
1 1 0 1 2 3 4
1 2 5 6 7
Packets dropped on Transmit:
BPDU packets: 0
queue thresh dropped [cos-map]
1 1 0 [0 1 ]
1 2 0 [2 3 ]
2 1 0 [4 6 ]
2 2 486* [7 ]
3 1 486* [5 ]
* - shared transmit counter
Packets dropped on Receive:
BPDU packets: 0
queue thresh dropped [cos-map]
1 1 0 [0 1 2 3 4 ]
1 2 0 [5 6 7 ]
Thanks,
Marcelocheck out the following link on Troubleshooting Output Drops with Priority Queueing, hope this helps :
http://www.cisco.com/en/US/tech/tk39/tk51/technologies_tech_note09186a0080103e8a.shtml -
Hello,
I'm testing in a LAB QoS configuration for 7600 (SUP720-3B) with 12.2-18.SXF3 with many diffenents cards.
Following Cisco documentation, I have two diferent scenarios:
1. OSM and WAN interfaces supports CBWFQ and LLC and it works fine, as I understand it should work. We could create a priority queue and many standard queues to clasify the traffic and assign differents BW.
2. LAN interfaces don't support CBWFQ and LLC and we should use the Queue Architecture of the card and WRR and WRED, which are implemented on the ASICs. This is what Cisco calls Hardware-Switched Traffic.
Here it depends of the card you use what Queue Architecture you could use. But most cards have a Strict-Priority Queue and one or more standard queues.
My question is regarding about the diferent behavior of the priority queue (LLC) and the Strict-Priority queue in case of congestion on the interface.
From my testings I got:
+ 1st scenario (Priotity Queue - LLC)
In case of congestion of the interface, QoS provide to the Priority Queue just the BW configured. If the BW offered in this queue is higher than the BW configured, there're packet drops.
The rest of the standard queues shares the rest of the BW available on the interface.
+ 2nd scenario (Hardware-Switched Traffic)
Even with or without congestion, I get almost the same behavior. The router always try to transmit the traffic of the strict-priority queue first. So it doesn't matter how much BW you allocate to the strict-priority queue and the standard queues. The card always try to transmit the traffic of strict-priority queue first.
Is this the desired behavior or there's something wrong?
The behavior of the priority queue should be the same in both scenarios?
I got the following answers from Cisco Web Site which doesn't answer my question completely (See attached file).
Anyone tried this before???
Thanks.
PacoHello Baley,
Thanks for your reply. I read this link before but it doesn't explain exactly what happens in the scenario described before.
Few days ago I got an answer from Cisco which confirms what I read from the FAQ: Till Strict-Priority Queue isn't empty, packets on the WRR queues aren't send. This behavior is completely different from the well known LLQ.
Catalyst 6500/6000 QoS FAQ
Q. On egress queuing, if the strict priority queue is saturated, will traffic eventually be served in the weighted round-robin (WRR) queues?
A. No, the WRR queues are not served until the priority queue is completely empty. -
Hello,
From what I have gathered from documentation the Nexus is able to mark any DSCP value between 0-63. I would assume it would be able to classify based on any DSCP value as well. The documentation however leads me to believe otherwise. The language for marking suggest valid values are from 0 to 63. For classification the language suggests classification can only match standard DSCP values. I would test but do not have a Nexus at my disposal. Can someone with experience please confirm?
Classification
http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/command/reference/qos/n5k-qos_cmds_m.html#wp1079436
Marking
http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/command/reference/qos/n5k-qos_cmds_s.html#wp1159955
regards,
ryanHi Ryan,
As you can see from my 5010 lab switch:
24.09.5010B.1(config)# policy-map type qos my_policy
24.09.5010B.1(config-pmap-qos)# class type qos my_class
24.09.5010B.1(config-pmap-c-qos)# set dscp ?
<0-63> DSCP value
af11 AF11 dscp (001010)
af12 AF12 dscp (001100)
af13 AF13 dscp (001110)
af21 AF21 dscp (010010)
af22 AF22 dscp (010100)
af23 AF23 dscp (010110)
af31 AF31 dscp (011010)
af32 AF32 dscp (011100)
af33 AF33 dscp (011110)
af41 AF41 dscp (100010)
af42 AF42 dscp (100100)
af43 AF43 dscp (100110)
cs1 CS1(precedence 1) dscp (001000)
cs2 CS2(precedence 2) dscp (010000)
cs3 CS3(precedence 3) dscp (011000)
cs4 CS4(precedence 4) dscp (100000)
cs5 CS5(precedence 5) dscp (101000)
cs6 CS6(precedence 6) dscp (110000)
cs7 CS7(precedence 7) dscp (111000)
default Default dscp (000000)
ef EF dscp (101110)
The only DSCP values you can set are 0-63, as you suspected.
However, these are the only DSCP values you are supposed to be able to match as well:
24.09.5010B.1(config-cmap-qos)# match dscp ?
<0-63> List of DSCP values
af11 AF11 dscp (001010)
af12 AF12 dscp (001100)
af13 AF13 dscp (001110)
af21 AF21 dscp (010010)
af22 AF22 dscp (010100)
af23 AF23 dscp (010110)
af31 AF31 dscp (011010)
af32 AF32 dscp (011100)
af33 AF33 dscp (011110)
af41 AF41 dscp (100010)
af42 AF42 dscp (100100)
af43 AF43 dscp (100110)
cs1 CS1(precedence 1) dscp (001000)
cs2 CS2(precedence 2) dscp (010000)
cs3 CS3(precedence 3) dscp (011000)
cs4 CS4(precedence 4) dscp (100000)
cs5 CS5(precedence 5) dscp (101000)
cs6 CS6(precedence 6) dscp (110000)
cs7 CS7(precedence 7) dscp (111000)
default Default dscp (000000)
ef EF dscp (101110)
This output was taken on our latest version of code, and the 5500 series is the same.
- Amanda
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