Y.1564 Service Activation Testing on NCS : Part2
| Paban Sarma, Technical Marketing Engineer ([email protected]) |
| Chethan K .S, Software Test Lead ([email protected]) |
Overview
In Previous Article we looked at the Y.1564 concepts and example configuration to run a Y.1564 Service Activation Test on NCS 5500 and NCS 500 routers. In this part, we will explore more capabilities such as color aware test and their application.
Y.1564 Color Profile
An ethernet service activation test can be either color aware or color blind. By default, a test is color blind and only a single flow is generated at a rate configured in the information rate. The color aware mode is distinguished by use of a different COS marking. This different COS identifies the Excess Information Rate (EIR) flow. The committed flow uses the COS value provided in the “outer-COS” and “inner-COS” configuration. In a color aware flow, the EIR flow that is generated might have the discard eligibility indicator (DEI) set (dei =1). By default, it is not set (dei=0). The Committed information rate (CIR) needs to be configured for color-aware mode and EIR is obtained from the difference of information rate (IR) and committed information rate (CIR).
ethernet service-activation-test
profile profile_#_1
outer-cos 1
color-aware cir 700 mbps eir-color cos 0
information-rate 1 gbps
packet-size 512
The line color-aware cir 700 mbps eir-color cos 0 in the SADT profile denotes that this is a color aware profile. The committed information rate (CIR) is specified in the same configuration line. The excess information rate (EIR) is obtained from the difference of information rate (IR) and the CIR . When traffic is generated, traffic within CIR is marked with the outer-cos value in profile, traffic exceeding CIR profile is marked with the eir-color cos.
There are certain restriction on cos values that can be used in an color aware Service Activation Profile shown in the below table:
PCP value (COS) | Support for Color Blind | Support for color aware w/o DEI (0) | Support for color aware w/ DEI set (1) |
|---|---|---|---|
0 | ✔ | ✔ | ✔ |
1 | ✔ | ✔ | ✔ |
2 | ✔ | ✔ | X |
3 | ✔ | ✔ | X |
4 | ✔ | ✔ | X |
5 | ✔ | X | X |
6 | ✔ | ✔ | X |
7 | ✔ | X | X |
Note: Color aware profile needs the cos values to be preserved in the packets. Therefore, color aware Service Activation Test can’t be supported if we have pop operation configured on the attachment circuits (EFPs)
Y.1564 Color Aware Profile Configuration
Color aware profile without DEI bit
profile ca1
outer-cos 4
mode two-way
duration 5 minutes
color-aware cir 300 mbps eir-color cos 3
description color_aware_sat_profile
packet-size 1500
information-rate 500 mbps
!
The Profile Generates traffic at 500 Mbps and a CIR of 300 Mbps. The CIR traffic is marked with COS value of 4. The EIR is 200 Mbps (500-200) and EIR traffic is marked with COS value of 3. The following figures shows the snapshot of generated traffic. 
Color aware profile with DEI bit
profile ca2
outer-cos 1
mode two-way
duration 5 minutes
color-aware cir 300 mbps eir-color set-dei cos 0
description color_aware_sat_profile_w_dei
packet-size 1500
information-rate 500 mbps
!
This profile generates traffic at 500 Mbps with a CIR if 300 Mbps. The CIR traffic is marked with COS value of 1. The EIR here is 200 Mbps (500- 300) and EIR traffic is marked with COS 0 and DEI bit for EIR traffic is also set to 1. The following figures shows the snapshot of generated traffic. 
Application: Validating Color Aware/Multi-CoS Bandwidth Profile
In this section, we will explore the application of color aware traffic generation to validate a point-to-point L2 service with a multi COS bandwidth profile. The color aware profile uses two different COS values to generate a CIR and EIR flow. It can be used to validate a service where a color aware or a multi-COS policer is enforced
Scenario:
A 500 Mbps point-to-point circuit needs to be provisioned with a multi COS bandwidth profile. Both the traffic classes are identified by COS value of 4 and 3. COS 4 has a committed rate of 300 Mbps and peak up to 500 Mbps, similarly COS 3 has a committed rate of 200 Mbps and peak up to 500 Mbps. Total traffic is committed at 500 Mbps and peak rate is also 500 Mbps. This is achieved using a conform-aware hierarchical BWP where parent has a 500 Mbps CIR and PIR policer. The child classes have their individual policer with CIR of 300 and 200 Mbps respectively. Peak-rate for both child is 500 Mbps. The objective is to check if Committed rate is met for both child classes when total traffic rate matching both class cross 500 Mbps.
Solution:
Once the circuit and QoS all are in place, the service can be validated using a color aware SADT profile. We can leverage the CIR and EIR flows to simultaneously check traffic from both class. We will generate same rate of traffic for both flows (1Gbps each) and check if cos4 is limited to 300 and cos3 is limited to 200 Mbps. Individual class peak-rate can be validated by simply using color blind profiles.
Configuration and Verifications
config on PE1
interface TenGigE0/0/0/0.1001 l2transport
encapsulation dot1q 1001
mtu 9000
ethernet service-activation-test
permit internal
!
service-policy input conform-parent
!
L2vpn
xconnect group vpws
p2p ll_pw
interface TenGigE0/0/0/0.1001
neighbor ipv4 2.2.2.2 pw-id 1001
config on PE2
interface TenGigE0/0/0/2.1001 l2transport
encapsulation dot1q 1001
mtu 9000
ethernet loopback
permit internal
!
service-policy input conform-parent
!
L2vpn
xconnect group vpws
p2p ll_pw
interface TenGigE0/0/0/2.1001
neighbor ipv4 1.1.1.1 pw-id 1001
Common QoS Config
policy-map conform-parent
class class-default
service-policy conform-child
police rate 500 mbps peak-rate 500 mbps
!
!
end-policy-map
class-map match-any green
match COS 4
end-class-map
!
class-map match-any yellow
match COS 3
end-class-map
policy-map conform-child
class green
police rate 300 mbps peak-rate 500 mbps
!
!
class yellow
police rate 200 mbps peak-rate 500 mbps
!
!
class class-default
police rate 0 bps
!
!
end-policy-map
SADT Profile configuration:
ethernet service-activation-test
profile color-aware
outer-cos 4
mode two-way
duration 15 minutes
color-aware cir 1 gbps eir-color cos 3
packet-size 1500
information-rate 2 gbps
ethernet service-activation-test
profile color-blind
outer-cos 4
mode two-way
duration 15 minutes
packet-size 1500
information-rate 2 gbps
The color aware profile used to validate the BWP is generating IR at 2 Gbps (1Gbps CIR & 2-1=1Gbps EIR). The expectation is we would see 70% loss for CIR and 80% loss for the EIR streams. To validate individual class can peak upto 500 Mbps, color blind profile is used at 2 Gbps and expected FLR is 75%.
SADT Result
Now, we start the service activation test on the UNI interface. The loopback is enabled on the remote UNI in internal direction. From below results, we see that both during the test and after the test the cumulative traffic loss for class green (CIR, COS 4) is 70% which means 300 Mbps traffic is flowing through the circuit. For EIR it is 80% FLR meaning 200 Mbps is guaranteed.
ethernet service-activation-test start interface TenGigE0/0/0/0.1001 profile color-aware destination 1.2.3 direction internal
Note: The remote PE must enable a MAC swap loop for correct SADT statistics. EDPL functionality can be used on Cisco NCS devices for this.
RP/0/RP0/CPU0:PE1# RP/0/RP0/CPU0:T-2006#show ethernet service-activation-test interface TenGigE0/0/0/0.1001
Mon Feb 1 10:50:24.335 UTC
Interface TenGigE0/0/0/0.1001
Service activation tests permitted (internal only)
Test completed:
Duration 15 minute(s)
Information rate 2 Gbps
Color-aware, CIR: 1 Gbps, EIR: CoS 3
Internal, Two-way, Destination 00:01:00:02:00:03
Packet size 1500, Pattern hex 0x00
Outer CoS 4
Results:
Step 1, Information Rate 2 Gbps
CIR packets:
Tx packets: 74923274, bytes: 112384911000
Rx packets: 22180963, bytes: 33271444500
FL: 52742311, FLR: 70%
FD: Min 11.736us, Mean 14.605us, Max 17.532us
IFDV: Not supported
Out of order packets: 11220557 (15%)
Error packets: 0 (0%)
EIR packets:
Tx packets: 74923274, bytes: 112384911000
Rx packets: 14696226, bytes: 22044339000
FL: 60227048, FLR: 80%
FD: Min 12.224us, Mean 14.625us, Max 17.480us
IFDV: Not supported
Out of order packets: 10596475 (14%)
Error packets: 0 (0%)
RP/0/RP0/CPU0:T-2006#show policy-map int TenGigE 0/0/0/0.1001 input
Mon Feb 1 10:20:32.468 UTC
TenGigE0/0/0/0.1001 input: conform-parent
Class class-default
Classification statistics (packets/bytes) (rate - kbps)
Matched : 191993780/288374657560 1999997
Transmitted : 47299928/71044491856 492736
Total Dropped : 144693852/217330165704 1507261
Policing statistics (packets/bytes) (rate - kbps)
Policed(conform) : 47299928/71044491856 492763
Policed(exceed) : 0/0 0
Policed(violate) : 144693852/217330165704 1507327
Policed and dropped : 144693852/217330165704
Policy conform-child Class green
Classification statistics (packets/bytes) (rate - kbps)
Matched : 21072224/31650480448 999951
Transmitted : 6230480/9358180960 295643
Total Dropped : 14841744/22292299488 704308
Policing statistics (packets/bytes) (rate - kbps)
Policed(conform) : 6230480/9358180960 295643
Policed(exceed) : 0/0 0
Policed(violate) : 14841744/22292299488 704308
Policed and dropped : 14841744/22292299488
Policed and dropped(parent policer) : 0/0
Policy conform-child Class yellow
Classification statistics (packets/bytes) (rate - kbps)
Matched : 95996887/144187324274 1000046
Transmitted : 41069448/61686310896 197093
Total Dropped : 54927439/82501013378 802953
Policing statistics (packets/bytes) (rate - kbps)
Policed(conform) : 41069448/61686310896 197093
Policed(exceed) : 0/0 0
Policed(violate) : 54927439/82501013378 802953
Policed and dropped : 54927439/82501013378
Policed and dropped(parent policer) : 0/0
As we see from above results Committed rate for both service is met. The FLR of ~70% and 80% for the CIR and EIR flows mean a throughput of 300 Mbps and 200 Mbps for the CoS 4 and CoS 3 respectively.
The below output for the color blind profile can validate that individually, the CoS 4 class can reach a peak-rate of 500 Mbps. The test is run on ideal scenario and the FLR of 75% on 2 Gbps IR indicates that a throughput of 500 Mbps is achieved.
In Both of the test result there is out of order packets which is expected as OOO is flagged if a recieved packet sequence is different from the expected sequence and it is bound to happen when some of the generated packets are loss due to QoS enforecment.
RP/0/RP0/CPU0:T-2006#show ethernet service-activation-test interface TenGigE0/0/0/0.1001
Mon Feb 1 16:43:44.589 UTC
Interface TenGigE0/0/0/0.1001
Service activation tests permitted (internal only)
Test completed:
Duration 15 minute(s)
Information rate 2 Gbps
Color-blind
Internal, Two-way, Destination 00:01:00:02:00:03
Packet size 1500, Pattern hex 0x00
Outer CoS 4
Results:
Step 1, Information Rate 2 Gbps
CIR packets:
Tx packets: 149851022, bytes: 224776533000
Rx packets: 36768654, bytes: 55152981000
FL: 113082368, FLR: 75%
FD: Min 12.188us, Mean 14.825us, Max 20.252us
IFDV: Not supported
Out of order packets: 11284818 (8%)
Error packets: 0 (0%)
EIR packets:
Tx packets: 0, bytes: 0
Rx packets: 0, bytes: 0
FL: 0, FLR: 0%
FD: Min 0.000us, Mean 0.000us, Max 0.000us
IFDV: Min 0.000us, Mean 0.000us, Max 0.000us
Out of order packets: 0 (0%)
Error packets: 0 (0%)
RP/0/RP0/CPU0:T-2006#show policy-map interface tenGigE 0/0/0/0.1001
Mon Feb 1 16:50:17.880 UTC
TenGigE0/0/0/0.1001 input: conform-parent
Class class-default
Classification statistics (packets/bytes) (rate - kbps)
Matched : 45190770/67876536540 2000402
Transmitted : 11133061/16721857622 492788
Total Dropped : 34057709/51154678918 1507614
Policing statistics (packets/bytes) (rate - kbps)
Policed(conform) : 11133061/16721857622 492788
Policed(exceed) : 0/0 0
Policed(violate) : 34057709/51154678918 1507614
Policed and dropped : 34057709/51154678918
Policy conform-child Class green
Classification statistics (packets/bytes) (rate - kbps)
Matched : 45190770/67876536540 2000402
Transmitted : 11133061/16721857622 492788
Total Dropped : 34057709/51154678918 1507614
Policing statistics (packets/bytes) (rate - kbps)
Policed(conform) : 11133061/16721857622 492788
Policed(exceed) : 0/0 0
Policed(violate) : 34057709/51154678918 1507614
Policed and dropped : 34057709/51154678918
Policed and dropped(parent policer) : 0/0
Policy conform-child Class yellow
Classification statistics (packets/bytes) (rate - kbps)
Matched : 0/0 0
Transmitted : 0/0 0
Total Dropped : 0/0 0
Policing statistics (packets/bytes) (rate - kbps)
Policed(conform) : 0/0 0
Policed(exceed) : 0/0 0
Policed(violate) : 0/0 0
Policed and dropped : 0/0
Policed and dropped(parent policer) : 0/0
Policy conform-child Class class-default
Classification statistics (packets/bytes) (rate - kbps)
Matched : 0/0 0
Transmitted : 0/0 0
Total Dropped : 0/0 0
Policing statistics (packets/bytes) (rate - kbps)
Policed(conform) : 0/0 0
Policed(exceed) : 0/0 0
Policed(violate) : 0/0 0
Policed and dropped : 0/0
Policed and dropped(parent policer) : 0/0
Policy Bag Stats time: 1612198187756 [Local Time: 02/01/21 16:49:47.756]
Conclusion
We covered Y.1564 color aware test profile and various aspects of the configuration. We have also illustrated one use case scenario, where color aware SADT comes handy in verifying a L2 service with multi-CoS/color aware bandwidth profile.
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