Table Of Contents

Configuring the ATM Traffic-Shaping Carrier Module

About the ATM Traffic-Shaping Carrier Module

ATM TSCAM Features

Hardware and Software Restrictions

Hardware Restrictions

Software Restrictions

About Interface Congestion Thresholds

Configuring the ATM TSCAM

Configuring Maximum Thresholds

Configuring Maximum Thresholds for Traffic Classes

Configuring Maximum Thresholds for VCs

Displaying Traffic-Shaping Configurations

Traffic-shaping Granularity Tables

Configuring the ATM Traffic-Shaping Carrier Module

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This chapter describes the features and configuration procedures for the ATM traffic-shaping carrier module (TSCAM). The TSCAM is available on the Catalyst 8510 MSR and the LightStream 1010 ATM switch routers.

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Note This chapter provides advanced configuration instructions for the Catalyst 8510 MSR and LightStream 1010 ATM switch routers. For complete descriptions of the commands mentioned in this chapter, refer to the ATM and Layer 3 Switch Router Command Reference publication.

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This chapter includes the following sections:

• About the ATM Traffic-Shaping Carrier Module

• Hardware and Software Restrictions

• Configuring the ATM TSCAM

• Configuring Maximum Thresholds

• Displaying Traffic-Shaping Configurations

• Traffic-shaping Granularity Tables

About the ATM Traffic-Shaping Carrier Module

The ATM traffic-shaping carrier module (TSCAM) augments the current traffic-shaping capabilities for the Catalyst 8510 MSR and the LightStream 1010 ATM switch routers by providing variable bit rate (VBR) and best-effort traffic-shaping capabilities. The TSCAM shapes the streams of cells sent over virtual connections (VCs) so they conform to bandwidth parameters, and they do not exceed the expected flow into the network. The TSCAM does this by temporarily holding cells in buffers and dispersing them as bandwidth parameters allow on the outgoing connection. The TSCAM helps ensure that cells are not dropped if they exceed the maximum traffic-flow parameters established between private and public networks.

You can enable traffic shaping on subcard 0 of a slot that is equipped with the TSCAM. For OC-3, T1, E1, and DS3 port adapters, a maximum of four traffic classes can be shaped. For example, if only VBR traffic is shaped, traffic shaping for VBR can be configured on a maximum of four ports (each port shapes two classes). If VBR traffic and best-effort traffic is shaped, a maximum of two ports can be configured for traffic shaping. For OC-12 port adapters, only one traffic class can be shaped.

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Note Traffic-shaping configurations do not apply to regular virtual path (VP) tunnels defined on that interface, except in the case of unspecified bit rate (UBR) VP tunnels. For example, when best-effort traffic shaping is enabled on a physical interface, all the UBR VP tunnels defined on that interface are shaped to their peak cell rate (PCR), but individual VCs within those VP tunnels are not shaped.

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The TSCAM schedules the traffic classes constant bit rate (CBR), VBR, and best effort in a strict priority in which CBR is the highest priority and best effort is the lowest priority. The best-effort traffic class includes UBR, available bit rate (ABR) and UBR+ service categories. When traffic shaping is disabled for all the traffic classes on a port, all the traffic from that port is switched unaltered as if it were a single connection at the highest priority.

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Note Traffic shaping in the TSCAM is disabled by default. Any changes to shaping configurations are supported across switch reloads only.

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An example of how the ATM TSCAM might work in a network is shown in Figure 22-1. In this example, the TSCAM is in a Catalyst 8510 MSR switch router that is on the edge of a private enterprise network connected to a public ATM network. The TSCAM helps ensure that the maximum number of cells transmit through to the public network.

Figure 22-1 TSCAM on an Enterprise Private Network

ATM TSCAM Features

The ATM TSCAM offers the following benefits:

•Traffic shaping for up to four ports on any combination of T1, E1, and DS3 ports

•Traffic shaping for up to three ports on OC-3 ports

•Traffic shaping for up to one OC-12 port

•VC functionality for up to 32K VCs

•An aggregate bandwidth of OC-12

•Online insertion and removal (OIR)

•Traffic shaping for VBR and best-effort traffic

•Up to four TSCAMs in a chassis

•Up to four ports 256K cell buffers share

Hardware and Software Restrictions

This section lists the hardware and software restrictions for the TSCAM.

Hardware Restrictions

The following hardware restrictions apply to the TSCAMs of the Catalyst 8510 MSR and LightStream 1010 ATM switch:

•Although the TSCAM occupies one full slot on the switch router, the traffic-shaping functionality can only be applied to ports on subcard 0.

•The TSCAM accommodates only OC-3, T1, E1, DS3, or OC-12 port adapters.

•Only three traffic classes can be shaped on the OC-3 port adapter.

•The TSCAM is not compatible with the FC-PCQ feature card.

•Successive OIR operations must have a delay of 1 minute between them, especially reseating a TSCAM itself or reseating the port adapter in subslot 0 in the TSCAM.

Software Restrictions

The following software restrictions apply to the TSCAMs of the Catalyst 8510 MSR and LightStream 1010 switch routers:

•Each TSCAM requires 2 MB of continuous main memory availability in the switch.

•Well-known VCs on an interface that is enabled for VBR traffic shaping will be automatically shaped at the maximum cell rate of that interface. Changing shaping properties for these VCs is not allowed.

•Any changes to the shaping configurations are supported across switch reloads.

•Tag switching VCs and Multiprotocol Label Switching (MPLS) VCs are not currently supported.

•The maximum rate to which a VC can be shaped on an OC-12 interface is 595,085 Kbps

•The minimum rate that a VC can be shaped is as follows:

–36 Kbps for DS3, E3, T1, E1, and OC-3 interfaces

–145 Kbps for OC-12 interfaces

•When VBR connections are shaped using sustainable cell rate (SCR), PCR, and maximum burst size (MBS), the burst tolerance computed always rounds up to the next higher value that conforms to the expression ((2ⁿ)-1). For example, if the burst tolerance calculated is 144, the actual burst tolerance used is 255 or ((2⁸)-1).

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Note Burst tolerance is not applicable to the shaping of best-effort connections and the PCR-only mode of shaping for VBR connections.

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•Each TSCAM requires 2 MB of contiguous main memory availability in the system.

•The maximum rate at which a VC can be shaped on an OC-12 interface is 595,085 Kbps.

•The minimum rate at which a VC can be shaped to is as below :

–36 Kbps for DS3, E3, T1, and E1 interfaces

–37 Kbps for OC-3 Interfaces

–145 Kbps for OC-12 Interfaces.

About Interface Congestion Thresholds

A total of 256K cell buffers are available on the TSCAM. On an interface enabled for shaping, the number of available cell buffers is the same as the maximum threshold for that interface. Table 22-1 lists the maximum threshold values. These values are the defaults and depend on the number of interfaces configured for traffic shaping. The maximum congestion thresholds for interfaces are not configurable.

Table 22-1 Default Interface Maximum Thresholds 

Number of Shaped Interfaces	Maximum Cell Threshold for Unshaped Interfaces	Maximum Cell Threshold for Shaped Interfaces
0	65536	0
1	2816	253952
2	4096	126976
3	4096	86016
4	0	65536

Configuring the ATM TSCAM

To configure traffic shaping on your ATM TSCAM, perform the following steps, beginning in global configuration mode:

	Command	Purpose
Step 1	Switch(config)# interface atm card/subcard/port Switch(config-if)#	Selects the physical interface to be configured.
Step 2	Switch(config-if)# atm traffic shaping enable {vbr [pcr-only] | best-effort} Switch(config-if)# exit	Enables traffic shaping.
Step 3	Switch# copy system:running-config nvram:startup-config	Copies the running configuration in system memory to the startup configuration stored in NVRAM.

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Note Any changes to the traffic-shaping configuration take effect upon saving the configurations to NVRAM and reloading the switch, or upon performing an OIR on the port adapter in subcard 0 of the ATM TSCAM.

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Example

The following example shows how to enable VBR traffic shaping:

Switch# configure terminal 

Switch(config)# interface atm 4/0/0

Switch(config-if)# atm traffic shaping enable vbr

Switch(config-if)# end

Switch# copy system:running-config nvram:startup-config

Configuring Maximum Thresholds

The ATM TSCAM supports maximum thresholds for traffic class and for VCs. This section describes how to configure these thresholds.

Configuring Maximum Thresholds for Traffic Classes

To configure traffic class thresholds, perform the following steps, beginning in privileged EXEC mode:

	Command	Purpose
Step 1	Switch# show atm vc atm slot/subslot/port	Verifies that the VCs on the interface are in a down state.
Step 2	Switch# configure terminal Switch(config)#	Enters interface global configuration mode.
Step 3	Switch(config)# interface atm slot/subslot/port Switch(config-if)#	Enters interface configuration mode.
Step 4	Switch(config-if)# shutdown	Disables the interface.
Step 5	Switch(config-if)# atm traffic shaping thresholds class {best-effort | vbr} maximum percent	Sets traffic-shaping thresholds on an interface.
Step 6	Switch(config-if)# no shutdown	Enables the interface.

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Note Prior to changing the traffic class maximum threshold configuration, you must disable the interface using the shutdown command. You do not have to disable the interface when configuring per-VC maximum thresholds.

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Example

The following example shows how to configure a traffic-shaping threshold for a traffic class:

Switch# show atm vc interface atm 0/0/0

Interface         VPI  VCI   Type   X-Interface      X-VPI X-VCI Encap  Status 

ATM0/0/0          0    5     PVC    ATM0             0     49    QSAAL  DOWN

ATM0/0/0          0    16    PVC    ATM0             0     35    ILMI   DOWN

Switch# configure terminal

Switch(config)# interface atm 0/0/0

Switch(config-if)# shutdown 

Switch(config-if)# atm traffic shaping thresholds class vbr maximum 80

Switch(config-if)# no shutdown

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Note Class maximum thresholds are expressed as percentages of the interface maximum threshold values. To display interface maximum thresholds, enter the show atm interface resource atm slot/subslot/port in privileged EXEC mode.

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Configuring Maximum Thresholds for VCs

To configure VC thresholds, perform the following steps, beginning in global configuration mode:

	Command	Purpose
Step 1	Switch(config)# interface atm slot/subslot/port Switch(config-if)#	Enters interface configuration mode.
Step 2	Switch(config-if)# atm traffic shaping thresholds vc {best-effort | vbr} maximum buffers	Sets traffic-shaping thresholds on an interface.

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Note New per-VC maximum thresholds only apply to new VCs created after making the threshold configuration changes. The new threshold configuration is not applied to the maximum threshold values of existing VCs.

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Example

The following example shows how to configure traffic-shaping thresholds for VCs:

Switch(config)# interface atm 0/0/0

Switch(config-if)# atm traffic shaping thresholds vc vbr maximum 3000

Displaying Traffic-Shaping Configurations

To show the traffic-shaping configuration of the switch, use the following privileged EXEC commands:

Command	Purpose
Switch# show atm traffic shaping slot slot	Verifies that traffic shaping is enabled on a slot.
Switch# show atm interface resource atm slot/subslot/port	Verifies the traffic-shaping threshold configurations.
Switch# show atm vc interface atm slot/subslot/port vpi vci	Displays traffic-shaping statistics.

Examples

The following example shows the configured ports on a Catalyst 8510 MSR switch router:

Switch# show atm traffic shaping slot 4

CATS Carrier Module State : ACTIVE

Shaper Configuration Status :

   Shapers In Use by Config : 3  Shapers Available for Config : 1

Shaper Hardware Status :

   Shaper 0 :  In Use - interface : atm 4/0/1 - Class : vbr

   Shaper 1 :  In Use - interface : atm 4/0/2 - Class : Best-Effort

   Shaper 2 :  Not In Use.

   Shaper 3 :  Not In Use.

Statistics :

   Total cell discards = 15, clp0 discards = 3,  clp1 discards = 12

   Free cell buffers = 203852

   cells queued for all ports = 58291

The following example shows the threshold values configured on a Catalyst 8510 MSR switch router:

Switch# show atm interface resource atm4/0/0

Resource Management configuration:

    Service Classes:

        Service Category map: c2 cbr, c2 vbr-rt, c3 vbr-nrt, c4 abr, c5 ubr

        Scheduling: RS c1 WRR c2, WRR c3, WRR c4, WRR c5

        WRR Weight: 15 c2, 2 c3, 2 c4, 2 c5

    Interface traffic-shaping Configuration:

        VBR Shaping : Enabled in Config - Enabled In hardware

        Best-Effort Shaping : Enabled in Config - Enabled In hardware

	VBR Class MaxThreshold : 

	 Configuration : 40%, Installed Cell Buffers : 47104

	Best-Effort Class MaxThreshold : 

	 Configuration : 60%, Installed Cell Buffers : 77824

	Per-VC Queue Thresholds for VBR : 

	 MaxThreshold : Configured = 512, Installed = 512

	Per-VC Queue Thresholds for Best-Effort : 

	 MaxThreshold : Configured = 1024, Installed = 1024

CAC Configuration to account for Framing Overhead : Disabled

    Pacing: disabled   0 Kbps rate configured, 0 Kbps rate installed

    overbooking :  disabled

Service Categories supported: cbr,vbr-rt,vbr-nrt,abr,ubr

    Link Distance: 0 kilometers

. . .

. . .

Resource Management state:

Traffic Shaper Interface MaxThreshold (in cell buffers) :

        Currently Installed : 65536,  Value on Next Reset : 65536

Traffic Shaper Interface queue cell count : 0

Available bit rates (in Kbps):

        147743 cbr RX, 147743 cbr TX, 147743 vbr RX, 147743 vbr TX,

        147743 abr RX, 147743 abr TX, 147743 ubr RX, 147743 ubr TX

    Allocated bit rates:

        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX,

        0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX

    Best effort connections: 0 pvcs,  0 svcs

The following example shows the traffic-shaping statistics on a Catalyst 8510 MSR switch router:

switch# show atm vc interface atm 4/0/1 0 5

Interface: ATM4/0/1, Type: oc3suni 

VPI = 0  VCI = 5

Status: UP

Time-since-last-status-change: 00:00:25

Connection-type: PVC 

Cast-type: point-to-point

Packet-discard-option: enabled

Usage-Parameter-Control (UPC): pass

Wrr weight: 15

Number of OAM-configured connections: 0

OAM-configuration: disabled

OAM-states:  Not-applicable

Cross-connect-interface: ATM0, Type: ATM Swi/Proc 

Cross-connect-VPI = 0 

Cross-connect-VCI = 84

Cross-connect-UPC: pass

Cross-connect OAM-configuration: disabled

Cross-connect OAM-state:  Not-applicable

Encapsulation: AALQSAAL

Connection Priority: High

Threshold Group: 6, Cells queued: 0

Rx cells: 7, Tx cells: 5

Tx Clp0:5,  Tx Clp1: 0

Rx Clp0:7,  Rx Clp1: 0

Rx Upc Violations:0, Rx cell drops:0

Rx pkts:7, Rx pkt drops:0

Switch Tx Statistics :

     Tx Clp0 : 5,  Tx Clp1 : 0, TxCells : 5

Rx connection-traffic-table-index: 3

Rx service-category: VBR-RT (Realtime Variable Bit Rate)

Rx pcr-clp01: 424

Rx scr-clp01: 424

Rx mcr-clp01: none

Rx      cdvt: 1024 (from default for interface)

Rx       mbs: 50

Tx connection-traffic-table-index: 3

Tx service-category: VBR-RT (Realtime Variable Bit Rate)

Tx pcr-clp01: 424

Tx scr-clp01: 424

Tx mcr-clp01: none

Tx      cdvt: none

Tx       mbs: 50

Traffic Shaper Connection Identifier : 9

Traffic Shaper Connection Queue Cell Count : 1

AAL5 statistics:

Crc Errors:0, Sar Timeouts:0, OverSizedSDUs:0

BufSzOvfl:  Small:0, Medium:0, Big:0, VeryBig:0, Large:0

Traffic-shaping Granularity Tables

This section lists the following granularity tables for configuring traffic-shaping rates on ATM interfaces:

• Best-Effort and VBR Shaping (PCR-Only Mode) Rates for DS3, E3, E1, and T1 (Cells Per Second)

• VBR Shaping (Using PCR, SCR and MBS) Values for DS3, E3, E1, and T1 (Cells Per Second)

• Best-Effort and VBR Shaping (Pcr-Only Mode) Rates for OC-3c (Cells Per Second)

• VBR Shaping (Using PCR, SCR and MBS) Rates for OC-3c (Cells Per Second)

• Best-Effort and VBR Shaping (PCR-Only Mode) Rates for OC-12 (Cells Per Second)

• VBR Shaping (Using PCR, SCR, and MBS) Rates for OC-12 (Cells Per Second)

The tables display shaping rates in cells per second and can be used for configuring connection traffic table (CTT) rows. When configuring CTT rows, the traffic parameters are specified in kilobits per second (kbps). By referring to the values listed in the tables, you can choose the rate in cells per second that most closely matches the desired kbps rate for CTT rows.

Two granularity tables represent each interface type. For example, Table 22-2 shows rates for best-effort connections and variable bit rate (VBR) connections using PCR-only mode. Table 22-3 shows rates for VBR connections shaped using their PCR, SCR, and MBS parameters (the default VBR shaping mode). The DS3, E3, E1, and T1 interfaces share the same values and are therefore represented in the same granularity tables.

The resource management software uses the following algorithm to convert the rates given in kbps to cells per second. You can also use the algorithm as a guideline for determining the kbps value that must be configured for the CTT rows.

In the following expression, kbps_val represents a rate specified in units of kbps and cps_val is the cell per second equivalent of the specified kbps_val. Also, the following expressions use integer division and the operator % represents modulus operations.

intermediate=(kbps_val * 125);

if ((intermediate % 53) !=0)

cps_val = (intermediate / 53) + 1;

else

cps_val = (intermediate / 53);

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Note Observed traffic-shaping rates may vary as much as 2% from the values listed in these tables.

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Table 22-2 shows the DS3, E3, E1, and T1 rates for best-effort connections and VBR connections when shaped using PCR-only mode.

Table 22-2 Best-Effort and VBR Shaping (PCR-Only Mode) Rates for DS3, E3, E1, and T1 (Cells Per Second) 

105510	105439	104946	104458	103974	103495	103021	102550	102084
101622	101164	100711	100261	99815	99374	98936	98502	98072
97646	97223	96804	96388	95976	95568	95163	94762	94363
93969	93577	93189	92804	92422	92043	91667	91295	90925
90558	90195	89834	89476	89121	88769	88419	88073	87728
87387	87048	86712	86379	86048	85719	85394	85070	84749
84430	84114	83800	83489	83180	82873	82568	82266	81965
81667	81371	81078	80786	80496	80209	79924	79640	79359
79079	78802	78526	78253	77981	77711	77443	77177	76913
76650	76390	76131	75873	75618	75364	75112	74862	74613
74366	74121	73877	73634	73394	73155	72917	72681	72447
72214	71982	71752	71524	71297	71071	70847	70624	70403
70183	69964	69747	69531	69316	69103	68891	68681	68471
68263	68056	67851	67646	67443	67241	67040	66841	66643
66445	66249	66055	65861	65668	65477	65286	65097	64909
64722	64536	64351	64167	63984	63803	63622	63442	63264
63086	62909	62733	62559	62385	62212	62040	61869	61699
61530	61362	61195	61029	60863	60699	60535	60372	60211
60050	59889	59730	59572	59414	59257	59101	58946	58792
58639	58486	58334	58183	58032	57883	57734	57586	57439
57292	57146	57001	56857	56714	56571	56429	56287	56146
56006	55867	55728	55591	55453	55317	55181	55046	54911
54777	54644	54511	54379	54248	54117	53987	53857	53729
53600	53473	53346	53219	53094	52968	52844	52720	52596
52473	52351	52229	52108	51987	51867	51748	51629	51511
51393	51275	51159	51042	50927	50811	50697	50582	50469
50356	50243	50131	50019	49908	49797	49687	49577	49468
49360	49251	49144	49036	48929	48823	48717	48612	48507
48402	48298	48194	48091	47988	47886	47784	47683	47582
47481	47381	47281	47182	47083	46985	46886	46789	46691
46595	46498	46402	46306	46211	46116	46022	45928	45834
45741	45648	45555	45463	45371	45279	45188	45098	45007
44917	44828	44738	44649	44561	44473	44385	44297	44210
44123	44037	43950	43864	43779	43694	43609	43524	43440
43356	43273	43190	43107	43024	42942	42860	42778	42697
42616	42535	42455	42375	42295	42215	42136	42057	41979
41900	41822	41745	41667	41590	41513	41437	41360	41284
41209	41133	41058	40983	40908	40834	40760	40686	40612
40539	40466	40393	40321	40248	40176	40105	40033	39962
39891	39820	39750	39680	39610	39540	39470	39401	39332
39263	39195	39127	39059	38991	38923	38856	38789	38722
38655	38589	38523	38457	38391	38325	38260	38195	38130
38066	38001	37937	37873	37809	37746	37682	37619	37556
37494	37431	37369	37307	37245	37183	37122	37061	36999
36939	36878	36817	36757	36697	36637	36578	36518	36459
36400	36341	36282	36224	36165	36107	36049	35991	35934
35876	35819	35762	35705	35649	35592	35536	35480	35424
35368	35312	35257	35202	35147	35092	35037	34982	34928
34874	34820	34766	34712	34658	34605	34552	34499	34446
34393	34341	34288	34236	34184	34132	34080	34028	33977
33926	33874	33823	33772	33722	33671	33621	33571	33520
33470	33421	33371	33322	33272	33223	33174	33125	33076
33028	32979	32931	32882	32834	32786	32739	32691	32643
32596	32549	32502	32455	32408	32361	32315	32268	32222
32176	32130	32084	32038	31992	31947	31902	31856	31811
31766	31721	31677	31632	31588	31543	31499	31455	31411
31367	31323	31280	31236	31193	31149	31106	31063	31020
30978	30935	30892	30850	30808	30765	30723	30681	30639
30598	30556	30515	30473	30432	30391	30350	30309	30268
30227	30186	30146	30106	30065	30025	29985	29945	29905
29865	29826	29786	29747	29707	29668	29629	29590	29551
29512	29473	29435	29396	29358	29320	29281	29243	29205
29167	29129	29092	29054	29016	28979	28942	28904	28867
28830	28793	28756	28720	28683	28646	28610	28573	28537
28501	28465	28429	28393	28357	28321	28286	28250	28215
28179	28144	28109	28073	28038	28003	27969	27934	27899
27864	27830	27796	27761	27727	27693	27659	27625	27591
27557	27523	27489	27456	27422	27389	27355	27322	27289
27256	27223	27190	27157	27124	27091	27059	27026	26994
26961	26929	26897	26865	26832	26800	26769	26737	26705
26673	26642	26610	26578	26547	26516	26484	26453	26422
26391	26360	26329	26298	26268	26237	26206	26176	26145
26115	26085	26054	26024	25994	25964	25934	25904	25874
25844	25815	25785	25756	25726	25697	25667	25638	25609
25580	25550	25521	25492	25464	25435	25406	25377	25349
25320	25291	25263	25235	25206	25178	25150	25122	25094
25066	25038	25010	24982	24954	24927	24899	24871	24844
24816	24789	24762	24734	24707	24680	24653	24626	24599
24572	24545	24518	24492	24465	24438	24412	24385	24359
24332	24306	24280	24254	24227	24201	24175	24149	24123
24097	24072	24046	24020	23994	23969	23943	23918	23892
23867	23842	23816	23791	23766	23741	23716	23691	23666
23641	23616	23591	23566	23542	23517	23493	23468	23443
23419	23395	23370	23346	23322	23298	23273	23249	23225
23201	23177	23153	23130	23106	23082	23058	23035	23011
22988	22964	22941	22917	22894	22871	22847	22824	22801
22778	22755	22732	22709	22686	22663	22640	22617	22594
22572	22549	22526	22504	22481	22459	22436	22414	22392
22369	22347	22325	22303	22281	22259	22237	22215	22193
22171	22149	22127	22105	22083	22062	22040	22019	21997
21975	21954	21932	21911	21890	21868	21847	21826	21805
21784	21762	21741	21720	21699	21678	21658	21637	21616
21595	21574	21554	21533	21512	21492	21471	21451	21430
21410	21389	21369	21349	21328	21308	21288	21268	21248
21228	21208	21188	21168	21148	21128	21108	21088	21068
21049	21029	21009	20990	20970	20950	20931	20911	20892
20873	20853	20834	20815	20795	20776	20757	20738	20719
20699	20680	20661	20642	20623	20605	20586	20567	20548
20529	20510	20492	20473	20454	20436	20417	20399	20380
20362	20343	20325	20306	20288	20270	20252	20233	20215
20197	20179	20161	20143	20124	20106	20088	20071	20053
20035	20017	19999	19981	19963	19946	19928	19910	19893
19875	19858