Issue of QoS Catalyst 3750

Hello

I have a scan server (IP = 1.2.3.4 for this example) who wreaks havoc when it works, which is evident in the number of drops of output I see.  I thought the police thing, but it is a production environment and 3750-G switch does not support Netflow or any other tool that would provide accurate estimates of flow to work from.

So, my thoughts are rather to implement queuing for the scan server and limit his access to common buffers, etc..  I would like to have some feedback on the config.  (I've included notes in an attempt to illustrate my thought.)

!**| Catalyst 3750-G | **
!
! * Activate QoS
!
MLS qos
!
! * Create custom queue-set
! * increase buffer 1 and disable the stamp 4
!
MLS qos all the output queue 2 buffers 50 25 25 0
!
! * To queue 1, make available to the threshold of 1 full buffer,
! * reserve full buffer for the local queue only, enable
! * queue to borrow 3 x more common pool pads.
!
MLS qos all the queue of output 2 1 100 100 100 400 threshold
!
! * To queue 3, make available to the threshold of 1 full buffer,
! * reserve 30% of buffer for the local queue only, enable
! * queue to borrow 4 x more common pool pads.
!
MLS qos all the queue of output 2 3 100 100 33 165 threshold
!
! * Assign values DSCP 16, 18, 20, 22 & to queue 1;
! * assign values DSCP 8, 10, 12, 14 & the queue of 3
!
queue threshold 1 dscp-map of MLS qos srr-queue output 1 16 18 20 22
queue threshold 3 dscp-map of MLS qos srr-queue output 1 8 10 12 14
!
! * To be complete, assign COS values associated with the same queues.
!
queue threshold cos 1-map of MLS qos srr-queue output 1 2
queue threshold cos 3-map of MLS qos srr-queue output 1 1
!
! * Access-list 130 identifies (bidirectional) scan traffic.
!
IP access-list 130 allow any host 1.2.3.4
access-list 130 allow the host ip 1.2.3.4 everything
!
! * Create a class map to match previously configured access group.
!
class-map correspondence-any CM-SCANS
Description * no critical analysis traffic
game group-access 130
output
!
! * Create policy-map to assign a DSCP values to analyze default traffic.
!
Policy-map PM-QOS-IN
Description * Ingress QoS strategy
class of CM-SCANS
set ip dscp af11
output
!
class class by default
set ip dscp af21
output
output
!
! * Assign the queue-series 2 and/or service-policy (single entry) if required.
!
gix/x/x interface
queue-series 2
entry of service-politics-PM-QOS-IN
output
!

PS - There is no voice that cross this switch, so I don't see it had to book the queue 1 for voice or turn on the priority queue, etc..

Any help is appreciated.  Thank you in advance.

Disclaimer

The author of this announcement offers the information in this publication without compensation and with the understanding of the reader that there is no implicit or explicit adequacy or adaptation to any purpose. Information provided is for information purposes only and should not be interpreted as making the professional advice of any kind. Use information from this announcement is only at risk of the reader.

RESPONSIBILITY

Any author will be responsible for any wha2tsoever of damage and interest (including, without limitation, damages for loss of use, data or profits) arising out of the use or inability to use the information in the view even if author has been advised of the possibility of such damages.

Poster

Well, then you're a little stuck trying to manage the flow of this server.  Unless you want to look at the penetration of the port police server and/or to "shape" the output port.  The idea being, if you can slow down the movement of this server, you might avoid configuration QoS requirements.

Otherwise, you're on the right track, in what you're trying to do.

You may want to traffic of tag to this server as 'trap' (CS1).  Ideally, you may be able to distinguish the traffic 'scan' of other traffic to and from this server.

On treatment of output of your QoS policy, rather than create a 'special' configuration to handle this traffic, you should consider having a policy that has a low priority class (scavenger), which is where direct you this traffic.  That is a policy of 4 class that takes in charge in time real (PQ), foreground (twice in 10 x % of the default value), by default and the background (1%), planning priorities.

3750 of buffer management, I found the setting of thresholds all up and moving more if not all buffers to the pool, usually works quite well.

Tags: Cisco Network

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    interface GigabitEthernet1/0/12

    No auto mdix

    !

    interface GigabitEthernet1/0/13

    No auto mdix

    !

    interface GigabitEthernet1/0/14

    No auto mdix

    !

    interface GigabitEthernet1/0/15

    No auto mdix

    !

    interface GigabitEthernet1/0/16

    No auto mdix

    !

    interface GigabitEthernet1/0/17

    No auto mdix

    !

    interface GigabitEthernet1/0/18

    No auto mdix

    !

    interface GigabitEthernet1/0/19

    No auto mdix

    !

    interface GigabitEthernet1/0/20

    No auto mdix

    !

    interface GigabitEthernet1/0/21

    No auto mdix

    !

    interface GigabitEthernet1/0/22

    No auto mdix

    !

    interface GigabitEthernet1/0/23

    No auto mdix

    !

    interface GigabitEthernet1/0/24

    No auto mdix

    !

    interface GigabitEthernet1/0/25

    !

    interface GigabitEthernet1/0/26

    !

    interface GigabitEthernet1/0/27

    !

    interface GigabitEthernet1/0/28

    !

    GigabitEthernet2/0/1 interface

    No auto mdix

    !

    interface GigabitEthernet2/0/2

    No auto mdix

    !

    interface GigabitEthernet2/0/3

    No auto mdix

    !

    interface GigabitEthernet2/0/4

    No auto mdix

    !

    interface GigabitEthernet2/0/5

    No auto mdix

    !

    interface GigabitEthernet2/0/6

    !

    interface GigabitEthernet2/0/7

    No auto mdix

    !

    interface GigabitEthernet2/0/8

    No auto mdix

    !

    interface GigabitEthernet2/0/9

    No auto mdix

    !

    interface GigabitEthernet2/0/10

    switchport trunk encapsulation dot1q

    switchport mode trunk

    No auto mdix

    active in mode channel-group 6

    !

    interface GigabitEthernet2/0/11

    No auto mdix

    !

    interface GigabitEthernet2/0/12

    No auto mdix

    !

    interface GigabitEthernet2/0/13

    No auto mdix

    !

    interface GigabitEthernet2/0/14

    No auto mdix

    !

    interface GigabitEthernet2/0/15

    No auto mdix

    !

    interface GigabitEthernet2/0/16

    No auto mdix

    !

    interface GigabitEthernet2/0/17

    No auto mdix

    !

    interface GigabitEthernet2/0/18

    No auto mdix

    !

    interface GigabitEthernet2/0/19

    No auto mdix

    !

    interface GigabitEthernet2/0/20

    No auto mdix

    !

    interface GigabitEthernet2/0/21

    No auto mdix

    !

    interface GigabitEthernet2/0/22

    No auto mdix

    !

    interface GigabitEthernet2/0/23

    No auto mdix

    !

    interface GigabitEthernet2/0/24

    No auto mdix

    !

    interface GigabitEthernet2/0/25

    !

    interface GigabitEthernet2/0/26

    !

    interface GigabitEthernet2/0/27

    !

    interface GigabitEthernet2/0/28

    !

    interface Vlan1

    the IP 192.168.0.1 255.255.255.0

    !

    default IP gateway - 192.168.76.102

    IP classless

    IP http server

    IP http secure server

    !

    activate the IP sla response alerts

    !

    !

    Line con 0

    line vty 0 4

    password Mil19

    opening of session

    line vty 5 15

    password Mil19

    opening of session

    !

    end

    Interface port-channel 6

    (in the example, there should be this line "identified in this channel: Gi2/article-gi1/0/10 0 / 10 ')


    sailing-sw-1 #show interfaces port-channel 6

    Channel6 port is down, line protocol is down (notconnect)

    Material is EtherChannel, address is 0000.0000.0000 (bia 0000.0000.0000)

    MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,

    reliability 255/255, txload 1/255, rxload 1/255

    Encapsulation ARPA, loopback not set

    KeepAlive set (10 sec)

    Link auto-duplex type, automatic speed is automatic, media type is unknown

    input stream control is turned off, output flow control is not supported

    Type of the ARP: ARPA, ARP Timeout 04:00

    Last entry, never, never hang output

    Final cleaning of "show interface" counters never

    Input queue: 0/75/0/0 (size/max/drops/dumps); Total output drops: 0

    Strategy of queues: fifo

    Output queue: 0/40 (size/max)

    5 minute input rate 0 bps, 0 packets/s

    5 minute output rate 0 bps, 0 packets/s

    0 packets input, 0 bytes, 0 no buffer

    Received 0 emissions (0 multicasts)

    0 Runts, 0 giants, 0 shifters

    entry 0, 0 CRC errors, frame 0, saturation 0, 0 ignored

    Watchdog 0, multicast 0, break 0 comments

    entry packets 0 with condition of dribble detected

    exit 0 packets, 0 bytes, 0 underruns

    0 output errors, 0 collisions, 1 interface resets

    0 babbles, collision end 0, 0 deferred

    carrier, 0 no carrier, lost 0 0 output BREAK

    output buffer, the output buffers 0 permuted 0 failures

    EtherChannel 6 Summary

    sailing-sw-1 #show etherchannel 6 Summary

    Flags: - Low P - D bundled in port-channel

    I have - autonomous s - suspended

    H Eve (LACP only)

    R - Layer 3 S - Layer2

    U - running f - cannot allocate an aggregator

    M - don't use, minimum contacts not satisfied

    u - unfit to tied selling

    w waiting to be aggregated

    d default port

    Number of channels: 1

    Number of aggregators: 1

    Protocol for the Port-Channel port group

    ------+-------------+-----------+-----------------------------------------------

    6 Po6 (SD) LACP Gi1/0/10 (I) Gi2/0/10 (I)

    Hello

    It seems that the grouping of NIC Linux box does not work properly. Please

    Check on the side of Linux.

    Kind regards

    NT

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