NCS 5500系列QoS故障排除指南

簡介

本檔案介紹Cisco Network Convergence System(NCS)5500系列的QoS故障排除指南。

NCS5500的QoS實現

• NCS5500中的QoS在NPU的入口和出口TM上執行。NCS5500實施了一個虛擬輸出隊列架構，其中出口隊列基於信用請求和授權方案。
  
  
• 實際緩衝發生在入口轉發裝置上。出口轉發裝置通過向任何請求信用的入口轉發裝置授予信用，來決定可以傳送多少流量。
  
  
• 任何輸出介面或排程元素的所有隊列都會複製到所有希望將資料包傳送到該介面的輸入裝置。這些隊列稱為虛擬輸出隊列(VOQ)。
  
  
• 實際上每個介面或排程元素支援8個隊列。在出口時，排程元素支援優先順序、最小值、最大值和超額。計畫將根據這些屬性提供積分。
  
  
• 因此，在出口處配置介面的排程屬性，而在入口處配置擁塞控制和擁塞迴避值。
  
  
• 當IRPP決定將資料包傳送到指定的目標/輸出埠時，它會將該資料包放入特定VOQ。  在對封包進行排隊期間，系統會驗證封包是否可基於以下條件入隊。
  
  
• 在VOQ的緩衝區佔用率和入口介面的虛擬統計隊列(VSQ)設定上。VSQ是基於流量類的緩衝區管理方案。
  
  
• 如果超過緩衝區，則根據對應的使用者配置，捨棄封包或流量控制傳送到輸入連線埠。預設情況下，如果資料包未通過入隊檢查，則會將其丟棄。
  
  
• NCS5500的LC沒有單獨的佇列ASIC。該平台實現了基於虛擬輸出的基於排程的排隊。因此沒有入口隊列的概念。入口服務 — 僅支援標籤操作和策略控制的策略。
     
• NCS5500實現了不同的標籤和排隊概念。它基於qos組和流量類。在出口上，這兩個引數與標籤流量和選擇隊列相匹配。

各種命令存在的限制。有關詳情，請參閱。

疑難排解指南

輸入QoS

show qos interface <interface> input|output是最有用且最重要的命令之一

它提供有關您應用的服務策略的有用資訊。它顯示配置和轉換的引數（在管制器、整形器、尾部丟棄閾值等情況下）、虛擬隊列ID、記帳型別等。 

從入口上的簡單策略開始。

class-map match-any i_match
match precedence ipv4 3
match mpls experimental topmost 3
end-class-map
!

policy-map ingress_marking
 class i_match
 set qos-group 3
 set discard-class 2
!
 class class-default
!
end-policy-map
!




RP/0/RP0/CPU0:xrg-ncs-04#show qos interface hundredGigE 0/0/0/35 input
Mon Dec 4 21:30:44.131 UTC
NOTE:- Configured values are displayed within parentheses
Interface HundredGigE0/0/0/35 ifh 0x138 -- input policy
NPU Id: 5
Total number of classes: 2
Interface Bandwidth: 100000000 kbps
Policy Name: ingress_marking
Accounting Type: Layer1 (Include Layer 1 encapsulation and above)
------------------------------------------------------------------------------
Level1 Class = i_match
New qos group = 3
New discard class = 2

Default Policer Bucket ID = 0x21
Default Policer Stats Handle = 0x0
Policer not configured for this class

Level1 Class = class-default

Default Policer Bucket ID = 0x20
Default Policer Stats Handle = 0x0
Policer not configured for this class

qos_ea正在對LC上的HW中的策略進行程式設計。使用show feature-mgr client qos-ea policy summary location<node>，您可以獲取LC上已配置策略的概述。 

RP/0/RP0/CPU0:xrg-ncs-04#show feature-mgr client qos-ea policy summary location 0/0/CPU0
Mon Dec 4 22:03:12.371 UTC
Pol-Num Flags Classes Ref-cnt In-Hash Compiled Policy Name
------- ---------- ------- ------- ------- -------- -----------
19 0x00004000 2 4 Yes Yes ingress_marking

如果檢視此命令的詳細檢視，您可以看到它在類中的匹配位置：

RP/0/RP0/CPU0:xrg-ncs-04#show feature-mgr client qos-ea policy policy ingress_marking location 0/0/CPU0
Mon Dec 4 22:07:53.134 UTC

Policy name: ingress_marking
Policy Number: 19
Flags: 0x4000 [DNX_FM_POL_TOS]
Class Number: 2
Reference Count: 4
In Hash: Yes
Is Compiled: Yes

Level: 0 Class Number: 0 Class Name: i_match
Match Count: 2 Flags: 0x0 Logical Op: MATCH_ANY
ACE: 0 Class:0 Match:0 proto IPV4 Flags:0x8011 [Grant]
Source IPv4 Address: 0.0.0.0 (255.255.255.255)
Destination IPv4 Address: 0.0.0.0 (255.255.255.255)
 Precedence Value: 3
UNKNOWN: UNKNOWN: UNKNOWN: ACE: 0 Class:0 Match:1 proto MPLS Flags:0x208040 [Grant]
 MPLS EXP Value: 3
UNKNOWN: UNKNOWN: UNKNOWN: Final List
ACE: 0 Class:0 Match:0 proto IPV4 Flags:0x8011 [Grant]
Source IPv4 Address: 0.0.0.0 (255.255.255.255)
Destination IPv4 Address: 0.0.0.0 (255.255.255.255)
Precedence Value: 3
UNKNOWN: UNKNOWN: UNKNOWN: ACE: 1 Class:0 Match:1 proto MPLS Flags:0x208040 [Grant]
MPLS EXP Value: 3
UNKNOWN: UNKNOWN: UNKNOWN:
Level: 0 Class Number: 1 Class Name: class-default
Match Count: 1 Flags: 0x0 Logical Op: MATCH_ANY
ACE: 0 Class:1 Match:0 proto ANY Flags:0x28000 [Grant][Default]
UNKNOWN: UNKNOWN: UNKNOWN: Final List
ACE: 2 Class:1 Match:0 proto ANY Flags:0x28000 [Grant][Default]
UNKNOWN: UNKNOWN: UNKNOWN:

QOS_EA資訊也可以從功能管理器角度顯示。首先顯示摘要：

RP/0/RP0/CPU0:xrg-ncs-04#show feature-mgr client qos-ea feature summary location 0/0/CPU0
Mon Dec 4 22:30:09.362 UTC
IFH NPU DIR Lookup-type ACL-ID Refcnt Feature-Name
---------- --- --- -------------------- ------ ------ ------------
0x138 5 IN IPV4_QOS 14 1 ingress_marking:0
0x138 5 IN IPV6_QOS 14 1 ingress_marking:0
0x138 5 IN MPLS_QOS 14 1 ingress_marking:0
0x138 5 IN L2_QOS 14 1 ingress_marking:0

在下一步中，您可以顯示詳細資訊：

RP/0/RP0/CPU0:xrg-ncs-04#show feature-mgr client qos-ea feature feature-name ingress_marking:0 direction ingress lookup mpls interface HundredGigE 0/0/0/35 location 0/0/CPU0
Mon Dec 4 22:31:20.588 UTC

Feature name: ingress_marking:0
Lookup Type: MPLS_QOS
Direction: IN
Reference Count: 1
NPU: 5
Interfaces Attached: HundredGigE0_0_0_35
Number of Entries: 2
Number of Verified Entries: 0
Number of ACEs: 2
ACL ID: 14
ACL ID Ref Cnt: 4
ACL ID Min Length(bits): 0
ACL ID Max Length(bits): 5
ACL ID Num Entries: 30
ACL ID Num Free Entries: 29
Compression Level: 0(UNCOMPRESSED)

qos_ea跟蹤顯示在介面上應用服務策略時事件的順序。如果發生故障，它會顯示問題。

RP/0/RP0/CPU0:xrg-ncs-04#show qos ea trace all reverse location 0/0/CPU0
Mon Dec 4 22:17:26.297 UTC
3077 wrapping entries (36992 possible, 18816 allocated, 0 filtered, 3077 total)
Dec 4 21:30:18.280 qos_ea/int_evts 0/0/CPU0 t14563 CAPS: (line# 2882) : Responded to IM (batch size: 1)
Dec 4 21:30:18.280 qos_ea/int_evts 0/0/CPU0 t14563 CAPS: post_caps_processing : Registering with ETHER EA for subid notification. Bulk count 1
Dec 4 21:30:18.280 qos_ea/int_evts 0/0/CPU0 t14563 CAPS: caps_add_notify_remote Input num of interfaces 1
Dec 4 21:30:18.280 qos_ea/int_evts 0/0/CPU0 t14563 CAPS: process_caps_add : End: count = 1 ok_count 1. New num_policies_in 1 num_policies_out 2
Dec 4 21:30:18.280 qos_ea/int_evts 0/0/CPU0 t14563 SCOL: scol_interface_add : ifh 0x138 ea_intf_type MainIf : interface added to SCOL tree
Dec 4 21:30:18.280 qos_ea/int_evts 0/0/CPU0 t14563 SCOL: scol_interface_add_internal : ifh 0x138: after avl_tree_insert, new tree size is 1
Dec 4 21:30:18.280 qos_ea/int_evts 0/0/CPU0 t14563 UTIL: (line# 1665) Child info aggr bw add: Current propagated_bw_sum in npu_ctx after adding propagated_bw in if_qos 0 is 0, ifh 0x138
Dec 4 21:30:18.280 qos_ea/int_evts 0/0/CPU0 t14563 UTIL: insert_if_qos_from_list_by_npu_ctx : Inserting to list: if_qos 0x3087c0bb78 prev 0x0 next 0x0 ifh 0x138 head 0x0 tail 0x0 count 0
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 ACTN: results_add for ifh 0x138 with pmap ingress_marking
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 CAPS: fm_program : npu_id 5 ifh 0x138 policy_name ingress_marking :Compiling policy and sending VMR to FM
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 ACTN: (line# 1597) : class_name class-default offset 0 policer_id 32: configuring policer...
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: policer_get : cir_kbps 720000000 cir_burst_kbits 32768 cir_burst 4194304pir_kbps 720000000 cir_burst_kbits 32768 pir_burst 4194304
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: policer_get : ifh 0x138 npu 5 offset 0 policer_id 32 mode/policer_type 0/0 inlif 0
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: policer_get : for ifh 0x138 for npu 5 offset 0
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 ACTN: (line# 1597) : class_name i_match offset 1 policer_id 33: configuring policer...
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: policer_get : cir_kbps 720000000 cir_burst_kbits 32768 cir_burst 4194304pir_kbps 720000000 cir_burst_kbits 32768 pir_burst 4194304
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: policer_get : ifh 0x138 npu 5 offset 1 policer_id 33 mode/policer_type 0/0 inlif 0
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: policer_get : for ifh 0x138 for npu 5 offset 1
Dec 4 21:30:18.217 qos_ea/int_evts 0/0/CPU0 t14563 ACTN: mark_actn_process Unconditional mark set for cmaps i_match
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 ACTN: resource_cfg for ifh 0x138 ul_ifh 0x0 with pmap ingress_marking
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 CMAP: classmap_process : chd 0x7feedd339b98, if_qos 0x3087c0bb78, class_info 0x3087c0b368
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 PWALK: preprocess_action : ifh 0x138 ul_ifh 0x0 policy_name ingress_marking class_name class-default
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 PWALK: pwalk_process_class : depth 0, usr_data->class_list 0x3087c0bb90, class_name class-default
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 CMAP: classmap_process : chd 0x7feedd33b478, if_qos 0x3087c0bb78, class_info 0x3087c0b770
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 PWALK: preprocess_action : ifh 0x138 ul_ifh 0x0 policy_name ingress_marking class_name i_match
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 PWALK: pwalk_process_class : depth 0, usr_data->class_list 0x3087c0bb90, class_name i_match
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 PWALK: pwalk_start_level : depth 0, stack 0x7fff8a11be40 ctx 0x7fff8a11c670
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 PWALK: policy_walk : policy_oper 0 policy_name ingress_marking ifh 0x138 ul_ifh 0x0 walk_flags 0x0
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 UTIL: if_qos_insert_to_db : Inserting to hash table: npu_id 5 ifh 0x138, ul_ifh 0x0, dir 0
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 RATE: dnx_qosea_policy_resolve : policy_name ingress_marking ifh 0x138 ul_ifh 0x0 intf_kbps 100000000
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 CAPS: policy_add : npu_id 5 ifh 0x138 ul_ifh 0x0 dir ingress policy_name ingress_marking num_classes 0 max_hierarchy 0
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 VRFY: policy_verify : Verifying policy ingress_marking pmaphd 0x7feedd2c1088
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 UTIL: if_qos_init : Initializing if_qos 0x3087c0bb78 with npu_id 5 ifh 0x138 ul_ifh 0x0 direction ingress ea_intf_type MainIf
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 VRFY: check_policy_on_parent_subintf : Did not find any reference to parent interface (0x138) in par_child_info_array
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 VRFY: check_policy_on_parent_subintf : parent_ifh: 0x138, dir: 0 (ingress)
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 UTIL: intf_bw_get : Banwdith of ifh 0x138 is intf_kbps: 100000000 kbps
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 CAPS: caps_add_int : ifh 0x138 ea_intf_type MainIf dir ingress
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 CAPS: caps_add : ifh 0x138 ea_intf_type MainIf dir ingress policy_name ingress_marking
Dec 4 21:30:18.100 qos_ea/int_evts 0/0/CPU0 t14563 CAPS: process_caps_add : 1 of 1 direction ingress on interface 0x138 policy_name ingress_marking
Dec 4 21:30:18.093 qos_ea/int_evts 0/0/CPU0 t14563 CAPS: process_caps_add : batch count = 1 . Current num_policies_in 0 num_policies_out 2
Dec 4 21:30:18.093 qos_ea/int_evts 0/0/CPU0 t14563 INT: im_msg_handler : Rx: caps add message (batch size: 1)

當您更改策略並將策略器新增到類i_match時，該策略在qos_ea跟蹤中可見。NCS5500支援策略對映的就地修改。

RP/0/RP0/CPU0:xrg-ncs-04(config-pmap-c)#police rate percent 50
RP/0/RP0/CPU0:xrg-ncs-04(config-pmap-c-police)#commit

Dec 4 22:49:39.567 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: policer_get : for ifh 0x138 for npu 5 offset 0
Dec 4 22:49:39.567 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: (line# 147) : cir_kbps 50000000 cir_burst 4194304pir_kbps 0 pir_burst 0
Dec 4 22:49:39.567 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: (line# 144) : ifh 0x138 npu 5 offset 1 policer_type = 0 is_parent=0policer_id = 33
Dec 4 22:49:39.567 qos_ea/int_evts 0/0/CPU0 t14563 ACTN: (line# 1822) : class_name i_match offset 0 policer_id 33: configuring policer...
Dec 4 22:49:39.567 qos_ea/int_evts 0/0/CPU0 t14563 ACTN: (line# 1597) : class_name i_match offset 1 policer_id 33: configuring policer...

show qos interface命令也會反映新增：

RP/0/RP0/CPU0:xrg-ncs-04#show qos interface hundredGigE 0/0/0/35 input
Mon Dec 4 23:25:19.684 UTC
NOTE:- Configured values are displayed within parentheses
Interface HundredGigE0/0/0/35 ifh 0x138 -- input policy
NPU Id: 5
Total number of classes: 2
Interface Bandwidth: 100000000 kbps
Policy Name: ingress_marking
Accounting Type: Layer1 (Include Layer 1 encapsulation and above)
------------------------------------------------------------------------------
Level1 Class = i_match
New qos group = 3
New discard class = 2

Policer Bucket ID = 0x21
Policer Stats Handle = 0x0
Policer committed rate = 49680000 kbps (50 %)
Policer conform burst = 4194304 bytes (default)

Level1 Class = class-default

Default Policer Bucket ID = 0x20
Default Policer Stats Handle = 0x0
Policer not configured for this class

執行上述命令時，qos_ea跟蹤也會顯示轉換後的值。 

監察器使用22 kbps的增量步長。線上卡上的公式中使用時，配置值四捨五入為最接近的22kbps倍數。 

Dec 4 23:25:19.773 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: policer_get : cir_kbps 49680000 cir_burst_kbits 32768 cir_burst 4194304pir_kbps 49680000 cir_burst_kbits 32768 pir_burst 4194304
Dec 4 23:25:19.773 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: policer_get : ifh 0x138 npu 5 offset 1 policer_id 33 mode/policer_type 0/0 inlif 0
Dec 4 23:25:19.773 qos_ea/int_evts 0/0/CPU0 t14563 POLICER-INT: policer_get : for ifh 0x138 for npu 5 offset 1

輸出QoS

輸出QoS支援排隊操作。在NCS5500上，可以在出口方向上具有兩個服務策略。一個用於標籤，一個用於排隊。這是用於標籤操作：

class-map match-any e_mark
match qos-group 3
end-class-map
!

policy-map egress_marking
class e_mark
set mpls experimental imposition 2
!
class class-default
!
end-policy-map
!

RP/0/RP0/CPU0:xrg-ncs-06#show feature-mgr client qos-ea policy summary location 0/0/CPU0
Thu Dec 21 10:44:33.978 UTC
Pol-Num Flags Classes Ref-cnt In-Hash Compiled Policy Name
------- ---------- ------- ------- ------- -------- -----------
1 0x01000000 2 1 Yes Yes egress_marking


RP/0/RP0/CPU0:xrg-ncs-06#show feature-mgr client qos-ea feature summary location 0/0/CPU0
Thu Dec 21 10:59:08.872 UTC
IFH NPU DIR Lookup-type ACL-ID Refcnt Feature-Name
---------- --- --- -------------------- ------ ------ ------------
0x340 0 OUT MAP_ID_QOS 0 1 egress_marking:0

輸出隊列策略

class-map match-any tc1
 match traffic-class 1
 end-class-map
!
class-map match-any tc2
 match traffic-class 2
 end-class-map
!
class-map match-any tc3
 match traffic-class 3
 end-class-map
!
class-map match-any tc4
 match traffic-class 4
 end-class-map
!
class-map match-any tc5
 match traffic-class 5
 end-class-map
!
policy-map POLICY_QOS_OUT
 class tc1
  priority level 1
  shape average percent 19
  queue-limit 500 us
 !
 class tc2
  priority level 2
  shape average percent 20
  queue-limit 500 us
 !
 class tc3
  bandwidth percent 1
 !
 class tc4
  bandwidth percent 20
 !
 class tc5
  bandwidth percent 20
 !
 class class-default
  bandwidth percent 20
 !
 end-policy-map
!

One can quick verify where a QoS policy is applied. 

RP/0/RP0/CPU0:xrg-ncs-04#show policy-map targets pmap-name POLICY_QOS_OUT location 0/0/CPU0
Mon Dec 18 21:13:01.463 UTC
1) Policymap: POLICY_QOS_OUT Type: qos
Targets (applied as main policy):
 HundredGigE0/0/0/35 output
Total targets: 1

Targets (applied as child policy):
Total targets: 0

show QoS interface命令顯示已配置的引數以及已配置排隊操作的每個類的隊列ID。此外，還可以獲取類似隊列大小的預設值。 

RP/0/RP0/CPU0:xrg-ncs-04#show qos interface hundredGigE 0/0/0/35 output

Thu Dec 14 20:56:29.796 UTC

NOTE:- Configured values are displayed within parentheses

Interface HundredGigE0/0/0/35 ifh 0x138  -- output policy

NPU Id:                        5

Total number of classes:       6

Interface Bandwidth:           100000000 kbps

VOQ Base:                      1032

Accounting Type:               Layer1 (Include Layer 1 encapsulation and above)

------------------------------------------------------------------------------

Level1 Class (HP1)                       =   tc1

Egressq Queue ID                         =   1033 (HP1 queue)

Queue Max. BW.                           =   0 kbps (19 %)

Guaranteed service rate                  =   19000000 kbps

TailDrop Threshold                       =   1187840 bytes / 500 us (500 us)

WRED not configured for this class


Level1 Class (HP2)                       =   tc2

Egressq Queue ID                         =   1034 (HP2 queue)

Queue Max. BW.                           =   0 kbps (20 %)

Guaranteed service rate                  =   20000000 kbps

TailDrop Threshold                       =   1253376 bytes / 501 us (500 us)

WRED not configured for this class


Level1 Class                             =   tc3

Egressq Queue ID                         =   1035 (LP queue)

Queue Max. BW.                           =   100884395 kbps (default)

Queue Min. BW.                           =   1020015 kbps (1 %)

Inverse Weight / Weight                  =   1 / (BWR not configured)

Guaranteed service rate                  =   1000000 kbps

TailDrop Threshold                       =   1253376 bytes / 10 ms (default)

WRED not configured for this class


Level1 Class                             =   tc4

Egressq Queue ID                         =   1036 (LP queue)

Queue Max. BW.                           =   100824615 kbps (default)

Queue Min. BW.                           =   20164923 kbps (20 %)

Inverse Weight / Weight                  =   1 / (BWR not configured)

Guaranteed service rate                  =   20000000 kbps

TailDrop Threshold                       =   25034752 bytes / 10 ms (default)

WRED not configured for this class


Level1 Class                             =   tc5

Egressq Queue ID                         =   1037 (LP queue)

Queue Max. BW.                           =   100824615 kbps (default)

Queue Min. BW.                           =   20164923 kbps (20 %)

Inverse Weight / Weight                  =   1 / (BWR not configured)

Guaranteed service rate                  =   20000000 kbps

TailDrop Threshold                       =   25034752 bytes / 10 ms (default)

WRED not configured for this class


Level1 Class                             =   class-default

Egressq Queue ID                         =   1032 (Default LP queue)

Queue Max. BW.                           =   100824615 kbps (default)

Queue Min. BW.                           =   20164923 kbps (20 %)

Inverse Weight / Weight                  =   1 / (BWR not configured)

Guaranteed service rate                  =   20000000 kbps

TailDrop Threshold                       =   25034752 bytes / 10 ms (default)

WRED not configured for this class


RP/0/RP0/CPU0:xrg-ncs-04#show feature-mgr client qos-ea policy summary location 0/0/CPU0

Thu Dec 14 21:27:30.486 UTC

Pol-Num  Flags     Classes Ref-cnt In-Hash Compiled  Policy Name

------- ---------- ------- ------- ------- -------- -----------

3       0x00010000       6       0     Yes       No POLICY_QOS_OUT

2       0x00000000       1       0     Yes       No p_out

1       0x00004000       2       4     Yes       Yes ingress_marking


RP/0/RP0/CPU0:xrg-ncs-04#show feature-mgr client qos-ea policy policy POLICY_QOS_OUT location 0/0/CPU0

Thu Dec 14 21:28:22.182 UTC


Policy name:        POLICY_QOS_OUT

Policy Number:      3

Flags:              0x10000 [DNX_FM_POL_TC]

Class Number:       6

Reference Count:    0

In Hash:            Yes

Is Compiled:        No


 Level: 0 Class Number: 0 Class Name: tc1

     Match Count: 1 Flags: 0x0 Logical Op: MATCH_ANY

         ACE: 0 Class:0 Match:0 proto ANY Flags:0x8080 [Grant]

                 DNX_FM_RANGE_TC: (1, 1)

                 UNKNOWN:                UNKNOWN:

 Level: 0 Class Number: 1 Class Name: tc2

     Match Count: 1 Flags: 0x0 Logical Op: MATCH_ANY

         ACE: 0 Class:1 Match:0 proto ANY Flags:0x8080 [Grant]

                 DNX_FM_RANGE_TC: (2, 2)

                 UNKNOWN:                UNKNOWN:

 Level: 0 Class Number: 2 Class Name: tc3

     Match Count: 1 Flags: 0x0 Logical Op: MATCH_ANY

         ACE: 0 Class:2 Match:0 proto ANY Flags:0x8080 [Grant]

                 DNX_FM_RANGE_TC: (3, 3)

                 UNKNOWN:                UNKNOWN:

 Level: 0 Class Number: 3 Class Name: tc4

     Match Count: 1 Flags: 0x0 Logical Op: MATCH_ANY

         ACE: 0 Class:3 Match:0 proto ANY Flags:0x8080 [Grant]

                 DNX_FM_RANGE_TC: (4, 4)

                 UNKNOWN:                UNKNOWN:

 Level: 0 Class Number: 4 Class Name: tc5

     Match Count: 1 Flags: 0x0 Logical Op: MATCH_ANY

         ACE: 0 Class:4 Match:0 proto ANY Flags:0x8080 [Grant]

                 DNX_FM_RANGE_TC: (5, 5)

                 UNKNOWN:                UNKNOWN:

 Level: 0 Class Number: 5 Class Name: class-default

     Match Count: 1 Flags: 0x0 Logical Op: MATCH_ANY

         ACE: 0 Class:5 Match:0 proto ANY Flags:0x28000 [Grant][Default]

                 UNKNOWN:                UNKNOWN:

Adding WRED:

policy-map POLICY_QOS_OUT
class tc4
random-detect discard-class 1 5 ms 15 ms
!
class class-default
!
end-policy-map
!
end

Level1 Class                             =   tc4

Egressq Queue ID                         =   1036 (LP queue)

Queue Max. BW.                           =   100824615 kbps (default)

Queue Min. BW.                           =   20164923 kbps (20 %)

Inverse Weight / Weight                  =   1 / (BWR not configured)

Guaranteed service rate                  =   20000000 kbps

TailDrop Threshold                       =   75497472 bytes / 30 ms (default)


WRED profile for Discard_Class 1

WRED Min. Threshold                      =   12517376 bytes (5 ms)

WRED Max. Threshold                      =   37748736 bytes (15 ms)


Default RED profile

WRED Min. Threshold                      =   0 bytes (0 ms)

WRED Max. Threshold                      =   0 bytes (0 ms)


RP/0/RP0/CPU0:xrg-ncs-04#show controllers npu voq-usage interface HundredGigE 0/0/0/35 instance 5 location 0/0/CPU0

Tue Nov  7 17:24:03.570 UTC




-------------------------------------------------------------------

Node ID: 0/0/CPU0

Intf         Intf     NPU NPU  PP   Sys   VOQ   Flow   VOQ    Port

name         handle    #  core Port Port  base  base   port   speed

             (hex)                                     type   (Gbps)

----------------------------------------------------------------------

Hu0/0/0/35   138       5   0    1   321   1032   1064 local   100            <- 1032 (Default LP queue) - displays the base queue -> refer to show qos interface commaand.


Display the queue details:


RP/0/RP0/CPU0:xrg-ncs-04#show controllers fia diagshell 5 "diag cosq voq id=1036 det=1" location 0/0/CPU0    <- 1036 (LP queue) - refer to show qos interface commaand.

Thu Dec 14 21:51:33.184 UTC




Node ID: 0/0/CPU0




Core 0:

Basic info

        Q type: voq

        num cos: 8, cosq class: 4

        Base queue id: 1032, base queue gport: 0x24000408

Credit request type: BCM_COSQ_DELAY_TOLERANCE_100G_SLOW_ENABLED Adjusted for slow enabled 100Gb ports

        Watchdog enable in common status message mode

        Is queue in credit watchdog queue range:True

        Credit watchdog message time: 0

        Delete queue time: 512

        Backoff enter queue credit balance threshold: 40960

        Backoff exit queue credit balance threshold: 40960

        Backlog enter queue credit balance threshold: 40960

        Backlog exit queue credit balance threshold: 40960

        Empty queue satisfied credit balance threshold: 0

        Max empty queue credit balance threshold: 16384

        Exceed max empty queue credit balance threshold: 1

        Off-To-Slow credit balance threshold: 0

        Off-To-Normal credit balance threshold: 38912

        Slow-To-Normal credit balance threshold: 38912

        Normal-To-Slow credit balance threshold: 38912

        Delay Tolerance is NOT OCB only

        Delay Tolerance is NOT High Q Priority

        Slow Level Thresh Down in slow level number: 0 is: 0

        Slow Level Thresh Down in slow level number: 1 is: 0

        Slow Level Thresh Down in slow level number: 2 is: 0

        Slow Level Thresh Down in slow level number: 3 is: 0

        Slow Level Thresh Down in slow level number: 4 is: 0

        Slow Level Thresh Down in slow level number: 5 is: 0

        Slow Level Thresh Down in slow level number: 6 is: 0

        Slow Level Thresh Up in slow level number: 0 is: 0

        Slow Level Thresh Up in slow level number: 1 is: 0

        Slow Level Thresh Up in slow level number: 2 is: 0

        Slow Level Thresh Up in slow level number: 3 is: 0

        Slow Level Thresh Up in slow level number: 4 is: 0

        Slow Level Thresh Up in slow level number: 5 is: 0

        Slow Level Thresh Up in slow level number: 6 is: 0

Credit value(local): 1024, Credit value(remote): 2048

Credit discount value: -2

Rate class info

        WRED info:

                Green : enable(False) min_thresh(0) max_thresh(0) drop_probability(0)

                Yellow: enable(True) min_thresh(12517376) max_thresh(37748736) drop_probability(9)

                Red   : enable(False) min_thresh(0) max_thresh(0) drop_probability(0)

                Black : enable(False) min_thresh(0) max_thresh(0) drop_probability(0)

        Tail drop info:

                Green : max queue size in bytes(75497472), max queue size in BDs(294912)

                Yellow: max queue size in bytes(75497472), max queue size in BDs(294912)

                Red   : max queue size in bytes(75497472), max queue size in BDs(294912)

                Black : max queue size in bytes(75497472), max queue size in BDs(294912)

        Guaranteed info:

                Green : min queue size in bytes(0), min queue size in BDs(0)

                Yellow: min queue size in bytes(0), min queue size in BDs(0)

                Red   : min queue size in bytes(0), min queue size in BDs(0)

                Black : min queue size in bytes(0), min queue size in BDs(0)

        Fair adaptive tail drop info:

                Enable: True

                Green : alpha(-2)

                Yellow: alpha(-2)

                Red   : alpha(-2)

                Black : alpha(-2)

        ECN wred info: enable(False) min_thresh(0) max_thresh(0) drop_probability(0)

        ECN max queue size in bytes(524288), max queue size in BDs(524288)

VSQ-related

        Category class: 2

        Traffic class: 4

        Connection class: 0

        Green : Admission-test-templates(0)

        Yellow: Admission-test-templates(0)

        Red   : Admission-test-templates(0)

        Black : Admission-test-templates(0)

        AdmissionTestProfileA[0]:'category, traffic class'

        AdmissionTestProfileB[0]: 'category'

current queue size: 0 bytes, current queue bds size: 0

Attached VOQ connector: 0x00000428

Destination sys port: 0x00007fff

OCB eligiblity: True


[SNIP]

output for core 1 is ommitted. 

要監控隊列大小，您可以為相應行運行上述命令和grep。

示例： show controllers fia diagshell 5 "diag cosq voq id=1036 core=0 det=1" location 0/0/CPU0 |當前隊列大小

可以使用show policy-map interface命令顯示統計資訊。

示例：show policy-map interface hundredGigE 0/0/0/35 output location 0/0/CPU0

附註：如我們從其他XR平台瞭解到的那樣，輸出並不詳盡。它不會顯示相應WRED或RED配置檔案的行。 

RP/0/RP0/CPU0:xrg-ncs-04#show policy-map interface hundredGigE 0/0/0/35 output location 0/0/CPU0

Thu Dec 14 22:05:50.971 UTC




Interface:HundredGigE0/0/0/35 Location: node0_0_CPU0 output: POLICY_QOS_OUT




Class tc1

  Classification statistics          (packets/bytes)     (rate - kbps)

    Matched             :                   0/0                    0

    Transmitted         :                   0/0                    0

    Total Dropped       :                   0/0                    0

  Queueing statistics

    Queue ID                             : 1033

    Taildropped(packets/bytes)           : 0/0

Class tc2

  Classification statistics          (packets/bytes)     (rate - kbps)

    Matched             :                   0/0                    0

    Transmitted         :                   0/0                    0

    Total Dropped       :                   0/0                    0

  Queueing statistics

    Queue ID                             : 1034

    Taildropped(packets/bytes)           : 0/0

Class tc3

  Classification statistics          (packets/bytes)     (rate - kbps)

    Matched             :                   0/0                    0

    Transmitted         :                   0/0                    0

    Total Dropped       :                   0/0                    0

  Queueing statistics

    Queue ID                             : 1035

    Taildropped(packets/bytes)           : 0/0

Class tc4

  Classification statistics          (packets/bytes)     (rate - kbps)

    Matched             :                   0/0                    0

    Transmitted         :                   0/0                    0

    Total Dropped       :                   0/0                    0

  Queueing statistics

    Queue ID                             : 1036

    Taildropped(packets/bytes)           : 0/0

Class tc5

  Classification statistics          (packets/bytes)     (rate - kbps)

    Matched             :                   0/0                    0

    Transmitted         :                   0/0                    0

    Total Dropped       :                   0/0                    0

  Queueing statistics

    Queue ID                             : 1037

    Taildropped(packets/bytes)           : 0/0

Class class-default

  Classification statistics          (packets/bytes)     (rate - kbps)

    Matched             :                   0/0                    0

    Transmitted         :                   0/0                    0

    Total Dropped       :                   0/0                    0

  Queueing statistics

    Queue ID                             : 1032

    Taildropped(packets/bytes)           : 0/0

監控FMQ

未計畫組播流量。它使用交換矩陣組播隊列(FMQ)，而不是傳統的VOQ。在分數出口組播上，不支援QoS。
要顯示FMQ的統計資訊，此命令從6.5.2開始可用：

RP/0/RP0/CPU0:NCS5508#show controllers npu stats voq base 0 instance 0 location 0/0/CPU0
Mon Jul 8 08:59:22.465 UTC

Asic Instance = 0
VOQ Base = 0
       ReceivedPkts   ReceivedBytes    DroppedPkts     DroppedBytes
-------------------------------------------------------------------
TC_0 = 224            15673            49              3468
TC_1 = 0              0                0               0
TC_2 = 0              0                0               0
TC_3 = 0              0                0               0
TC_4 = 0              0                0               0
TC_5 = 0              0                0               0
TC_6 = 0              0                0               0
TC_7 = 0              0                0               0

也可以通過NPU跟蹤資料包，並檢查是否應用了相應的流量類(TC)。請看一下

部分在傳輸資料包後執行相應的diag shell命令和過濾器。    

要收集的其他命令

以下是一些其他命令：

• show tech-support qos pi
• show tech-support qos platform
• show tech cef platform

如果懷疑某個介面上存在問題：

• show run interface <name>
• show run policy-map <>（適用於介面上應用的策略對映）
• show qos interface <name> input|output
• show policy-map interface <name> 
• show qos remote location <node>（用於出口策略）

如果介面是套件組合，請提供完整的套件組合成員資訊。

• 顯示套件組合<>

限制/警告

標籤

• 同一策略對映中不支援L2(COS， DEI)和L3(MPLS EXP)標籤

• 當策略與set discard-class組合使用時，策略器無法正常工作。

• match qos-group僅用於標籤。
• qos組0保留用於預設類。
• 不顯示標籤策略的統計資訊和計數器。

頻寬

• 策略對映中的所有bandwidth語句的總和不得大於100%
• 策略對映中的所有剩餘頻寬語句的總和不得大於100%
• 整形器不在類之間共用，因此對bandwidth語句的摘要沒有限制。

輸入QoS

入口服務策略中不支援隊列操作。

輸出QoS

• 標籤功能/操作非常有限。
• 僅支援traffic-class(TG)、qos-group(QG)和discard-class(DC)上的出口策略匹配。
  • TC — 用於隊列操作
  • QG — 用於標籤操作
  • DC - WRED
• 連線以下策略對映的服務策略將在出口介面上被拒絕：\
  
  

policy-map SET-AND-QUEUE-OUT
    class GOLD
      priority level 1
      shape average percent 20
      queue-limit 500 us
      set mpls experimental imposition 5

您收到的錯誤消息為： !!%「DNX_QOSEA」檢測到「警告」條件「出口策略對映配置無效」。使用qos-group標籤功能，使用traffic-class排隊功能」。

可以應用兩個獨立的服務策略，一個用於標籤，另一個用於佇列。 

總部

• 在子介面上應用服務策略時，如果HQoS配置檔案是平面的，則它需要獨立於該配置檔案。
• 在包含優先順序類的子介面上應用服務策略時，如果該類是分層或平面的，則需要該類中的整形器。

• 在HQoS模式下，優先順序類必須具有速率限制配置（整形器）。 將有效整形器值作為優先頻寬預留。

• 在HQoS模式中，在相同的策略對映配置下不支援同時支援頻寬(BW)和剩餘頻寬(BWR)。可以在同一個策略對映中配置頻寬或剩餘頻寬。
• 版本6.3.1之前的同一策略對映不支援BW各自BWR以及形狀。
• 父類中不允許使用WRED
• HQoS模式最多支援4個優先順序級別
• 同時不支援輸入HQoS策略和Ingress對等配置檔案。
• 對於二級策略，不支援父級別的使用者定義類。
• 由於TCAM限制，啟用HQoS配置檔案後，基於策略的隧道選擇(PBTS)不起作用。

提交後出現不支援的配置警告

在某些情況下，提交QoS配置後可能會看到警告日誌，如下例所示：

由於提交操作而檢測到驗證警告的百分比。請發出「show configuration warnings」以檢視警告

如果您執行建議的CLI，則會看到：

!! SEMANTIC ERRORS: This configuration was rejected by 
!! the system due to semantic errors. The individual 
!! errors with each failed configuration command can be 
!! found below.

<此處列印原因>

然而，會套用組態。在這種情況下，它可能來自楊氏驗證。

請檢查是否配置了配置驗證啟用。

如果是這種情況，那麼楊的統治可能已被解除。

您可以開啟debug configuration validation ccv detail，然後再次提交配置。

您應該會看到yang規則，該規則在調試輸出中觸發「Unsupported」消息。

Example:

RP/0/RP0/CPU0:Jan 22 15:57:44.441 UTC: ccv[189]: ...essage : 'Service Policy on interface "TenGigE0/0/0/7/1.102" is not supported', rule group name: 'qos-ma', rule name: 'cac-ser-pol-qos-in-unsupp-intf').

在這種情況下，請聯絡QoS PI團隊。