Convert MLS to MQC configuration

[sebastien3]

Hello,

I would like to convert the QoS configuration from a 3750 to a 4900M.

mls qos map cos-dscp 0 8 16 24 32 46 48 56

I can't find how to do with MQC for cos-dscp mapping...

Thanks !

[Jitendra Kumar]

Classification/Policing/marking on ingress so you will need to config your policy map as such.

policy-map PM_BW-IN
  class VOIP
         police rate percent 10
  class class-default
         police rate percent 80 

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/118629-technote-qos-00.html#anc32

[sebastien3]

Hello @Jitendra Kumar 

I don't understand your answer. I want to transcribe a configuration from the 3750X to a 4900M.

Here I want to map cos-dscp.

[sebastien3]

No body ?

[Joseph W. Doherty]

Have you read the reference @Jitendra Kumar provided?

Reason I ask, although it's for 3750 to 3850, the 3850 uses MQC so that tech note, hopefully, should help convert 3750 MLS QoS to any other Cisco device using MQC QoS.

That noted, I recall (?) the 4900M was based on a sup 4500, sup 6 (?).  If so, the various 4500 sups, have their own QoS features, unique to them, including the later sup architectures which support, more or less, MQC.  I.e. your 4900M might be "different" from what the tech note advises.

Since Cisco switches, traditionally, have had, again, more or less, QoS features that vary by switch platform, you might want to review the purpose of the 3750 MLS, doing CoS to DSCP (?), and determine, if what the 3750 was doing, still, really is what you want.

[sebastien3]

Hi @Joseph W. Doherty 

Yes I looked at @Jitendra Kumar  link but it talks about converting a 3750 to 3850. Here on a 4900M the commands don't exist... Just a small part...

I can't say what sup is in the 4900M ?

cisco WS-C4900M (MPC8548) processor (revision 2) with 524288K bytes of memory.
MPC8548 CPU at 1.33GHz, Cisco Catalyst 4900M
2 Virtual Ethernet interfaces
36 Gigabit Ethernet interfaces
16 Ten Gigabit Ethernet interfaces
511K bytes of non-volatile configuration memory.

My goal is to replace several 3750X with 4900M (need several 10G ports). I need to conserve classify/mark traffic from 8XX/9XX routers connected to the 4900M.

For example on the 881 here is the marking that I use which will arrive on the port G2/19 of a 4900M :

policy-map WAN-OUT
class VOICE
set cos 5
class OTHER_TRAFFIC
set cos 3
!
class-map match-all VOICE
match dscp ef
class-map match-all OTHER_TRAFFIC
match access-group name OTHER_TRAFFIC
!
interface GigabitEthernet8.19
description Connected to Switch 4900M GigabitEthernet2/19
encapsulation dot1Q 19
ip address 10.0.1.1 255.255.255.252
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
ip virtual-reassembly in
service-policy output WAN-OUT

Now I don't know how to keep marking and prioritizing certain streams on the 4900M. I would like the VOICE (COS 5/DSCP EF) stream to be transported as a priority on the 4900M uplinks as well as the OTHER_TRAFFIC stream of certain routers which are in COS 3/DSCP CS3. Some routers will not be privileged because in COS 1/DSCP CS1.

Is it easier to understand the purpose of the configuration ?

Thanks !