Configuring the Accounting of Policer Overhead in Interface Statistics

date_range 24-Nov-23

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The Metro Ethernet Forum (MEF) Carrier Ethernet (CE) 2.0 set of standards has stringent requirements to the bandwidth profile enforcement at the user-to-network interfaces (UNI). MEF CE 2.0 certification compliance allows only a 2 percent deviation from UNI committed or peak rate across all frame sizes. This means that the policers should take into account the frame size at the UNI interface, including frame checksum and excluding all additional overheads that might be added inside the service provider network (such as S-VLANs).

In order to address the MEF CE 2.0 stringent requirements to the bandwidth profile, policer-overhead adjustment is defined on a per IFL or direction granularity. The policer-overhead adjustment is in the range of -16 bytes to +16 bytes and is applied for all the policers that take into account Layer 1/ Layer 2 (L1/L2) packet length in the specified IFL or direction, including corresponding logical interface family (IFF) feature policers.

To configure the policer-overhead:

At the [edit interfaces] hierarchy level in configuration mode, create the interface on which to add the policer-overhead to input or output traffic.
```
[edit interfaces]
user@host# edit interfaces interface name
```
For example:
```
[edit interfaces interface name]
user@host# edit xe-0/1/6
```

Create the unit on which to add the policer overhead.

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[edit interfaces unit]
[edit interfaces interface name unit unit-number]

For example:

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[edit interfaces unit]
user@host# edit xe-0/1/6 unit 0

Configure the policer-overhead for the ingress policer.

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[edit interfaces interface name unit unit-number ]
user@host# set policer-overhead ingress value in bytes (-16..+16 bytes)

For example:

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[edit xe-0/1/6 unit 0]
user@host# set policer-overhead ingress 10;

Configure the policer-overhead for the egress policer.

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user@host# set policer-overhead egress value in bytes (-16..+16 bytes)

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[edit xe-0/1/6 unit 0]
user@host# set policer-overhead egress 10;

Verify the configuration.

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[edit interfaces]
user@host# show interfaces xe-0/1/6
xe-0/1/6 {                          
        unit 0 {                        
            policer-overhead {          
                ingress 10;             
                egress 10;              
            }                           
        }                               
    }
user@host>show interfaces xe-0/1/6    
Physical interface: xe-0/1/6, Enabled, Physical link is Up
  Interface index: 161, SNMP ifIndex: 544
  Link-level type: Ethernet, MTU: 1514, MRU: 1522, LAN-PHY mode, Speed: 10Gbps, BPDU Error: None, MAC-REWRITE Error: None,
  Loopback: None, Source filtering: Disabled, Flow control: Enabled
  Pad to minimum frame size: Disabled
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Schedulers     : 0
  Current address: 00:23:9c:fc:a8:58, Hardware address: 00:23:9c:fc:a8:58
  Last flapped   : 2015-09-13 20:12:36 PDT (14:21:57 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  Active alarms  : None
  Active defects : None
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0
  Link Degrade :                      
    Link Monitoring                   :  Disable
  Interface transmit statistics: Disabled

  Logical interface xe-0/1/6.0 (Index 339) (SNMP ifIndex 571)
    Flags: Up SNMP-Traps 0x4004000 Encapsulation: ENET2
    Policer overhead :
     Ingress policer overhead  :                    10 bytes
     Egress policer overhead   :                    10 bytes
    Input packets : 0
    Output packets: 0
    Protocol multiservice, MTU: Unlimited
      Flags: Is-Primary                 



user@host> show interfaces xe-0/1/6.0            
  Logical interface xe-0/1/6.0 (Index 339) (SNMP ifIndex 571)
    Flags: Up SNMP-Traps 0x4004000 Encapsulation: ENET2
    Policer overhead :
     Ingress policer overhead  :                    10 bytes
     Egress policer overhead   :                    10 bytes
    Input packets : 0
    Output packets: 0
    Protocol multiservice, MTU: Unlimited
      Flags: Is-Primary

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Routing Policies, Firewall Filters, and Traffic Policers User Guide

Configuring the Accounting of Policer Overhead in Interface Statistics

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