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QoS Marking

11/12/2011 By Andrew Roderos Leave a Comment

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QoS Layer 2 Marking

Ethernet 802.1Q/p

Switch (config-if)# mls qos 5
! Sets 802.1Q CoS to 5 on outer frame
Switch (config-if)# mls qos cos override
! Overrides any existing CoS value on the outer frame

Frame Relay Discard Eligible Bit

With Frame Relay, it uses 0 or 1 to mark the frame to indicate which one is more important. When it is marked with the value of 0 then it won’t be eligible to be dropped. When it is marked with the value of 1 then it would be eligible to be dropped when the network experiences congestion.

Router# sh run
policy-map SET-FR-DE
 class OUT-OF-SLA
  set fr-de

ATM Cell-Loss Priority Bit

ATM has the same mechanism to drop frames when there’s network congestion.

Router# sh run
policy-map SET-ATM-CLP
 class OUT-OF-SLA
  set atm-clp

MPLS Experimental Bits

MPLS is a tunneling protocol that uses labels to envelope an IP packet.

set mpls experimental imposition – Sets a specific value on all labels that are pushed onto the packet

set mpls experimental topmost – Sets a specific value only on the topmost MPLS label on the packet

References

Cisco QoS Exam Certification Guide (IP Telephony Self-Study) (2nd Edition)
End-to-End QoS Network Design: Quality of Service in LANs, WANs, and VPNs

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Filed Under: QoS Tagged With: Cisco, IOS

About Andrew Roderos

I am a network security engineer with a passion for networking and security. Follow me on Twitter, LinkedIn, and Instagram.

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