Port Oversubscription - The Cisco Learning Network
Port Oversubscription - The Cisco Learning Network
Port Oversubscription - The Cisco Learning Network
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<strong>Oversubscription</strong><br />
Dave McFarland CAE NCE
<strong>Port</strong> <strong>Oversubscription</strong><br />
Overview of Gen-1/2/3 products<br />
Gen-3 was released with NX-OS 4.X and is not part of the<br />
current CCIE SAN blueprint<br />
<strong>Oversubscription</strong> it relates to bandwidth<br />
<strong>Oversubscription</strong> it relates to configuring ISLs (E<br />
and TE ports)<br />
Rate-Mode oversubscription examples<br />
Presentation_ID © 2010 <strong>Cisco</strong> and/or its affiliates. All rights reserved. <strong>Cisco</strong> Public<br />
2
<strong>Port</strong> Bandwidth <strong>Oversubscription</strong><br />
On a Line card or fabric switch, this is when the<br />
available BW of a port is exceeded by the desired<br />
capacity of the port.<br />
e.g. On a DS-9016 (16 port line card).<br />
<strong>The</strong> slot and port SFP can allow 2 GB line rate on each<br />
port.<br />
<strong>The</strong>re is no oversubscription at this level. <strong>Oversubscription</strong><br />
is 1:1<br />
e.g. On a DS-9032 (32 port line card).<br />
<strong>The</strong> slot will only move 20 GB of full duplex traffic, with<br />
each of the 32 ports trying to run 2 GB.<br />
<strong>The</strong>re is oversubscription of 3.2:1 (64 GB / 20 GB)<br />
Presentation_ID © 2010 <strong>Cisco</strong> and/or its affiliates. All rights reserved. <strong>Cisco</strong> Public<br />
3
Generation-1<br />
Gen-1 is 1Gb and 2 Gb<br />
Gen-1 has specific requirements to dedicate speed. This is commonly used to<br />
create ISLs. <strong>The</strong> speed must be set.<br />
16 port Generation-1 Line Card<br />
16 port LC, all ports run at full line rate, default Auto<br />
<strong>Port</strong>s are Auto select (F, E, etc)<br />
32 port Generation-1 Line Card<br />
32 port LC, all ports are oversubscribed, default Fx<br />
Only 1 port in a port group can be configured as a ISL (E, TE) port<br />
For an ISL the switchport type must be set E/TE<br />
20/40 port Generation Fabric Switch<br />
All port are oversubscribed, default Fx<br />
Only the 1 st port in a port group can be configured as a ISL (E, TE) port<br />
Presentation_ID © 2010 <strong>Cisco</strong> and/or its affiliates. All rights reserved. <strong>Cisco</strong> Public<br />
4
Generation 2<br />
Gen-2 is 1/2/4 GB<br />
Generation 2 is much more flexible. But, with flexibility there is more configuration<br />
required .<br />
12 port Generation-2 Line Card<br />
All ports run at full line rate, default Auto<br />
<strong>Port</strong>s are Auto select (F, E, etc)<br />
18-4, 24, 48 port Generation-2 Line Card<br />
All ports are oversubscribed, default Fx<br />
Any port in a port group can be configured as a ISL (E, TE) port. Specific port<br />
speeds and dedicated rate modes must be followed<br />
9222i Generation-2 Fabric Switch<br />
All ports are oversubscribed, default Fx<br />
Any port in a port group can be configured as a ISL (E, TE) port. Specific port<br />
speeds and dedicated rate modes must be followed<br />
9124/9134 Generation-2 Fabric Switch<br />
All ports run at 4 GB full line rate, default Auto<br />
<strong>Port</strong>s are Auto select (F, E, etc)<br />
Presentation_ID © 2010 <strong>Cisco</strong> and/or its affiliates. All rights reserved. <strong>Cisco</strong> Public<br />
5
Generation 3<br />
Gen-3 is 1/2/4/8 Gb<br />
Generation 3 is the same as Generation-2 in terms of flexibility. <strong>The</strong>re is<br />
greater bandwidth in line card/fabric switch compared to generation-2<br />
48 port Generation-2 Line Card<br />
44/4<br />
All port are oversubscribed.<br />
Any port in a port group can be configured as a ISL (E, TE) port. Specific<br />
port speeds and dedicated rate modes must be followed<br />
All port are oversubscribed.<br />
Any port in a port group can be configured as a ISL (E, TE) port. Specific<br />
port speeds and dedicated rate modes must be followed<br />
9248 Generation-3 Fabric Switch<br />
All ports are 8 GB line rate<br />
Any port in a port group can be configured as a ISL (E, TE) port.<br />
Presentation_ID © 2010 <strong>Cisco</strong> and/or its affiliates. All rights reserved. <strong>Cisco</strong> Public<br />
6
Generation 2 and 3 Configuration Terminology<br />
<strong>Port</strong> Groups – <strong>Port</strong>ion of a switching element (line card or fabric switch) that<br />
has a subset of the allocated bandwidth<br />
<strong>Port</strong>s in a <strong>Port</strong> Group – Specific ports associated with a port group<br />
Rate-Mode Shared – Allocated bandwidth shared among ports that are<br />
configured as shared<br />
Rate-Mode Dedicated – Allocated bandwidth dedicated to ports that are<br />
configured as dedicated<br />
<strong>Oversubscription</strong> Ratio – Within a <strong>Port</strong> Group, the ratio of the available<br />
bandwidth to configured shared ports. <strong>The</strong>re are default values. This can be<br />
over-ridden on a module basis.<br />
Out-Of-Service – <strong>Port</strong> is removed from sharing any resources. This is not the<br />
same as “shut”. When a port is shut, resources are still allocated to it.<br />
Presentation_ID © 2010 <strong>Cisco</strong> and/or its affiliates. All rights reserved. <strong>Cisco</strong> Public<br />
7
Part Number Description<br />
Gen-2 Modules<br />
<strong>Port</strong>/<br />
group groups<br />
MaxBW/<br />
Bandwidth/ port<br />
group (Gbps) (Gbps)<br />
Max<br />
BW/slot<br />
Dedicated<br />
Rate mode<br />
Supported<br />
DS-X9148 48 port 4 Gbps 12 4 12.8 4 51.2Yes Yes<br />
Groups per this line card (4)<br />
12 ports per group<br />
Switching<br />
Module Type<br />
9148 Gen-2 Example<br />
Configured<br />
Speed Ratio Enabled Ratio Disabled<br />
Maximum BW<br />
Gbps<br />
48 <strong>Port</strong> Auto 4 0.8 0.09 4.2<br />
Shared rate<br />
mode<br />
supported<br />
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8
Configuring a Dedicated speed port on a 9148<br />
(e.g. for an ISL)<br />
I need to set the rate-mode dedicated and speed to 4000.<br />
ISLs cannot be shared rate mode.<br />
<strong>The</strong> number of ports and the speeds I can set dedicated<br />
are based on the available bandwidth in a <strong>Port</strong> Group<br />
If I run out of bandwidth in a port group, options are:<br />
Reduce the shared bandwidth on the remaining ports<br />
Out-of-Service <strong>Port</strong>s<br />
Disable oversubscription bandwidth ratio<br />
Use “show port-resources module X” over remembering<br />
tables<br />
Presentation_ID © 2010 <strong>Cisco</strong> and/or its affiliates. All rights reserved. <strong>Cisco</strong> Public<br />
9
Part Number Description<br />
Switching<br />
Module Type<br />
Configured<br />
Speed<br />
<strong>Port</strong>/<br />
group groups<br />
Ratio<br />
Enabled<br />
Ratio<br />
Disabled<br />
Maximum<br />
BW Gbps BW/Group<br />
48 <strong>Port</strong> Auto 4 0.8 0.09 4 12.8<br />
Auto 2 0.4 0.045 2 12.8<br />
1Gbps 0.2 0.0225 1 12.8<br />
With the ratio-enabled (default setting), you cannot create rate-mode<br />
dedicated ports that will cause the shared-mode port speed to exceed<br />
the ratio<br />
1 port at 4 GB dedicated in a port group<br />
With 1 x 4 GB dedicated, 12.8 – 1(4) = 8.8 GB remaining. I have 11<br />
remaining ports.<br />
At 4 GB shared ports, my ratio is 8.8 GB / 11= 0.88<br />
Per the table above, this will work.<br />
MaxBW/<br />
Bandwidth/ port<br />
group (Gbps) (Gbps)<br />
Max<br />
BW/slot<br />
Dedicated<br />
Rate mode<br />
Supported<br />
DS-X9148 48 port 4 Gbps 12 4 12.8 4 51.2Yes Yes<br />
Shared rate<br />
mode<br />
supported<br />
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10
cae-sj-9506-1(config)# interface fc 2/1<br />
cae-sj-9506-1(config-if)# switchport rate-mode dedicated<br />
cae-sj-9506-1(config-if)# switchport speed 4000<br />
cae-sj-9506-1(config-if)# do show port-resources module 2<br />
Module 2<br />
Available dedicated buffers are 4653<br />
<strong>Port</strong>-Group 1<br />
Total bandwidth is 12.8 Gbps<br />
Total shared bandwidth is 8.8 Gbps<br />
Allocated dedicated bandwidth is 4.0 Gbps<br />
--------------------------------------------------------------------<br />
Interfaces in the <strong>Port</strong>-Group B2B Credit Bandwidth Rate Mode<br />
Buffers (Gbps)<br />
-------------------------------------------------------------------fc2/1<br />
16 4.0 dedicated<br />
fc2/2 16 4.0 shared<br />
fc2/3 16 4.0 shared<br />
fc2/4 16 4.0 shared<br />
fc2/5 16 4.0 shared<br />
fc2/6 16 4.0 shared<br />
fc2/7 16 4.0 shared<br />
fc2/8 16 4.0 shared<br />
fc2/9 16 4.0 shared<br />
fc2/10 16 4.0 shared<br />
fc2/11 16 4.0 shared<br />
fc2/12 16 4.0 shared<br />
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11
Maximum 4 GB dedicated ports in a group<br />
Switching Configured<br />
Module Type Speed<br />
Ratio<br />
Enabled<br />
Ratio<br />
Disabled<br />
Maximum<br />
BW Gbps BW/Group<br />
48 <strong>Port</strong> Auto 4 0.8 0.09 4 12.8<br />
Auto 2 0.4 0.045 2 12.8<br />
1Gbps 0.2 0.0225 1 12.8<br />
How many rate mode-dedicated 4 GB ports can I create with the<br />
remaining ports 4 GB shared<br />
If I attempt to make one more, it fails<br />
cae-sj-9506-1(config-if)# interf fc 2/2<br />
cae-sj-9506-1(config-if)# switchport rate-mode dedicated<br />
fc2/2: (error) Bandwidth not available<br />
12.8 – (2 * 4) = 4.8 available<br />
4.8 / 10 (remaining ports) = .48 ratio<br />
I must set the remaining shared ports Auto 2 Gb or less for it to work<br />
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12
cae-sj-9506-1(config)# interface fc 2/3-12<br />
cae-sj-9506-1(config-if)# switchport speed<br />
cae-sj-9506-1(config-if)# switchport speed 2000<br />
cae-sj-9506-1(config-if)# exit<br />
cae-sj-9506-1(config)# interface fc 2/2<br />
cae-sj-9506-1(config-if)# switchport rate-mode dedicated<br />
cae-sj-9506-1(config-if)# do show port-resources module 2<br />
Module 2<br />
Available dedicated buffers are 4650<br />
<strong>Port</strong>-Group 1<br />
Total bandwidth is 12.8 Gbps<br />
Total shared bandwidth is 4.8 Gbps<br />
Allocated dedicated bandwidth is 8.0 Gbps<br />
--------------------------------------------------------------------<br />
Interfaces in the <strong>Port</strong>-Group B2B Credit Bandwidth Rate Mode<br />
Buffers (Gbps)<br />
-------------------------------------------------------------------fc2/1<br />
16 4.0 dedicated<br />
fc2/2 16 4.0 dedicated<br />
fc2/3 16 2.0 shared<br />
fc2/4 16 2.0 shared<br />
fc2/5 16 2.0 shared<br />
fc2/6 16 2.0 shared<br />
fc2/7 16 2.0 shared<br />
fc2/8 16 2.0 shared<br />
fc2/9 16 2.0 shared<br />
fc2/10 16 2.0 shared<br />
fc2/11 16 2.0 shared<br />
fc2/12 16 2.0 shared<br />
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13
3 x 4 GB in a <strong>Port</strong> Group?<br />
Switching Configured<br />
Module Type Speed<br />
Ratio<br />
Enabled<br />
Ratio<br />
Disabled<br />
Maximum<br />
BW Gbps BW/Group<br />
48 <strong>Port</strong> Auto 4 0.8 0.09 4 12.8<br />
Auto 2 0.4 0.045 2 12.8<br />
1Gbps 0.2 0.0225 1 12.8<br />
Can I make 3 ports rate-mode dedicated at 4 GB?<br />
12.8 – (3 * 4) = 0.8 GB remaining<br />
0.8 / (9 remaining ports) = 0.08 So, not even if I set the remaining ports<br />
to 1 GB<br />
<strong>The</strong> options at this point are to:<br />
Out-of-service ports<br />
Disable the oversubscription limit<br />
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14
cae-sj-9506-1(config)# interface fc 2/4-12<br />
cae-sj-9506-1(config-if)# switchport speed 1000<br />
cae-sj-9506-1(config)# interface fc 2/3<br />
cae-sj-9506-1(config-if)# switchport speed 4000<br />
cae-sj-9506-1(config-if)# switchport rate-mode dedicated<br />
fc2/3: (error) Bandwidth not available<br />
cae-sj-9506-1(config-if)# do sho port-resources module 2<br />
Module 2<br />
Available dedicated buffers are 4650<br />
<strong>Port</strong>-Group 1<br />
Total bandwidth is 12.8 Gbps<br />
Total shared bandwidth is 4.8 Gbps<br />
Allocated dedicated bandwidth is 8.0 Gbps<br />
--------------------------------------------------------------------<br />
Interfaces in the <strong>Port</strong>-Group B2B Credit Bandwidth Rate Mode<br />
Buffers (Gbps)<br />
-------------------------------------------------------------------fc2/1<br />
16 4.0 dedicated<br />
fc2/2 16 4.0 dedicated<br />
fc2/3 16 4.0 shared<br />
fc2/4 16 1.0 shared<br />
fc2/5 16 1.0 shared<br />
fc2/6 16 1.0 shared<br />
fc2/7 16 1.0 shared<br />
fc2/8 16 1.0 shared<br />
fc2/9 16 1.0 shared<br />
fc2/10 16 1.0 shared<br />
fc2/11 16 1.0 shared<br />
fc2/12 16 1.0 shared<br />
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15
Switching Configured<br />
Module Type Speed<br />
Out-of-Service<br />
Ratio<br />
Enabled<br />
Ratio<br />
Disabled<br />
Maximum<br />
BW Gbps BW/Group<br />
48 <strong>Port</strong> Auto 4 0.8 0.09 4 12.8<br />
Auto 2 0.4 0.045 2 12.8<br />
1Gbps 0.2 0.0225 1 12.8<br />
I need to place enough ports “Out-Of-Service” to meet the ratio<br />
requirements<br />
12.8 – (3 * 4) = 0.8 GB remaining<br />
0.8 / (9 remaining ports) = 0.08 So, not even if I set the remaining ports<br />
to 1 GB<br />
At 1 GB, the ratio must be >= 0.2<br />
0.8 GB remaining / 0.2 (GB/port ratio) = 4 ports. I must out-of-service the<br />
remaining 5 ports<br />
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16
cae-sj-9506-1(config-if)# interface fc 2/8-12<br />
cae-sj-9506-1(config-if)# shut<br />
cae-sj-9506-1(config-if)# out-of-service<br />
Putting an interface into out-of-service will cause its shared resource<br />
configuration to revert to default<br />
Do you wish to continue(y/n)? [n] y<br />
cae-sj-9506-1(config-if)# interface fc 2/3<br />
cae-sj-9506-1(config-if)# switchport rate-mode dedicated<br />
cae-sj-9506-1(config-if)# do show port-resources module 2<br />
Module 2<br />
Available dedicated buffers are 4792<br />
<strong>Port</strong>-Group 1<br />
Total bandwidth is 12.8 Gbps<br />
Total shared bandwidth is 0.8 Gbps<br />
Allocated dedicated bandwidth is 12.0 Gbps<br />
--------------------------------------------------------------------<br />
Interfaces in the <strong>Port</strong>-Group B2B Credit Bandwidth Rate Mode<br />
Buffers (Gbps)<br />
-------------------------------------------------------------------fc2/1<br />
16 4.0 dedicated<br />
fc2/2 16 4.0 dedicated<br />
fc2/3 16 4.0 dedicated<br />
fc2/4 16 1.0 shared<br />
fc2/5 16 1.0 shared<br />
fc2/6 16 1.0 shared<br />
fc2/7 16 1.0 shared<br />
fc2/8 (out-of-service)<br />
fc2/9 (out-of-service)<br />
fc2/10 (out-of-service)<br />
fc2/11 (out-of-service)<br />
fc2/12 (out-of-service)<br />
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17
Disable the default oversubscription ratio<br />
Switching Configured<br />
Module Type Speed<br />
Ratio<br />
Enabled<br />
Ratio<br />
Disabled<br />
Maximum<br />
BW Gbps BW/Group<br />
48 <strong>Port</strong> Auto 4 0.8 0.09 4 12.8<br />
Auto 2 0.4 0.045 2 12.8<br />
1Gbps 0.2 0.0225 1 12.8<br />
With 3 ports dedicated 4 GB, I have 0.8 GB remaining bandwidth<br />
0.8 / 9 (remaining ports) = 0.09 ratio<br />
Per the table above I can have the 9 remaining ports in 4 GB shared<br />
mode if I disable the oversubscription ratio<br />
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18
cae-sj-9506-1(config)# interface fc 2/1-3<br />
cae-sj-9506-1(config-if)# switchport rate-mode shared<br />
cae-sj-9506-1(config-if)# interface fc 2/8-12<br />
cae-sj-9506-1(config-if)# no out-of-service<br />
cae-sj-9506-1(config-if)# interface fc 2/1-12<br />
cae-sj-9506-1(config-if)# switchport speed 4000<br />
cae-sj-9506-1(config-if)# exit<br />
cae-sj-9506-1(config)# no rate-mode oversubscription-limit module 2<br />
cae-sj-9506-1(config)# interface fc 2/1-3<br />
cae-sj-9506-1(config-if)# switchport rate-mode dedicated<br />
cae-sj-9506-1(config-if)# do sho port-resources module 2<br />
Module 2<br />
Available dedicated buffers are 4647<br />
<strong>Port</strong>-Group 1<br />
Total bandwidth is 12.8 Gbps<br />
Total shared bandwidth is 0.8 Gbps<br />
Allocated dedicated bandwidth is 12.0 Gbps<br />
--------------------------------------------------------------------<br />
Interfaces in the <strong>Port</strong>-Group B2B Credit Bandwidth Rate Mode<br />
Buffers (Gbps)<br />
-------------------------------------------------------------------fc2/1<br />
16 4.0 dedicated<br />
fc2/2 16 4.0 dedicated<br />
fc2/3 16 4.0 dedicated<br />
fc2/4 16 4.0 shared<br />
fc2/5 16 4.0 shared<br />
fc2/6 16 4.0 shared<br />
fc2/7 16 4.0 shared<br />
fc2/8 16 4.0 shared<br />
fc2/9 16 4.0 shared<br />
fc2/10 16 4.0 shared<br />
fc2/11 16 4.0 shared<br />
fc2/12 16 4.0 shared<br />
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19
Gen-3 Module Details<br />
Part Number Description<br />
Modules > SAN-<br />
OS 3.3<br />
<strong>Port</strong>/<br />
group groups<br />
Bandwidth<br />
/<br />
group<br />
(Gbps)<br />
MaxBW/<br />
port<br />
(Gbps)<br />
Max<br />
BW/<br />
slot<br />
Dedicated<br />
Rate mode<br />
Supported<br />
DS-X9248-96K9 48 port 8 Gbps 6 8 12.8 8 102.8Yes Yes<br />
DS-X9224-96K9 24 port 8 Gbps<br />
4/44 port 8<br />
3 8 12.8 8 102.8Yes Yes<br />
DS-X9248-48K9 Gbps 12 4 12.8 8/4 51.2Yes Yes<br />
Fabric Switch<br />
SAN-OS > 3.3<br />
DS-C9148-K9 48 port 8 Gbps 4 6 32<br />
Line<br />
8rate<br />
Yes No<br />
Shared<br />
rate mode<br />
supported<br />
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20
Gen-2 Module Details<br />
Part Number Description<br />
Gen-2 Modules<br />
<strong>Port</strong>/<br />
group groups<br />
MaxBW/<br />
Bandwidth/ port<br />
group (Gbps) (Gbps)<br />
Max<br />
BW/slot<br />
Dedicated<br />
Rate mode<br />
Supported<br />
DS-X9148 48 port 4 Gbps 12 4 12.8 4 51.2Yes Yes<br />
DS-X9124 24 port 4 Gbps<br />
18 port 4 Gbps 4<br />
6 4 12.8 4 51.2Yes Yes<br />
DS-X9304-18K9 GigE 6 4 12.8 4 51.2Yes Yes<br />
DS-X9112 12 port 4 Gbps 3 4 12.8 4Line rate Yes No<br />
DS-X9704 4 port 10 Gbps 1 4 10 10Line rate Yes No<br />
Gen-2 Fabric Switch<br />
DS-C9134-K9<br />
32 port 4 Gbps 2<br />
port 10 Gbps 4 8 16 4Line rate Yes No<br />
1 2 10 10Line rate Yes No<br />
DS-C9124K9 24 port 4 Gbps<br />
18 port 4 Gbps 4<br />
4 6 16 4Line rate Yes No<br />
DS-C9222i-K9 GigE spare slot 6 3 13 4 48Yes Yes<br />
Shared rate<br />
mode<br />
supported<br />
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21
Gen-1 Module Details<br />
Part<br />
Number Description<br />
Gen-1<br />
Modules<br />
Gen-1<br />
Fabric<br />
Switch<br />
DS-X9016<br />
DS-X9032<br />
DS-C9120-<br />
K9<br />
DS-C9140-<br />
K9<br />
Bandwidth<br />
/<br />
<strong>Port</strong>/ group<br />
group groups (Gbps)<br />
MaxBW<br />
/<br />
port<br />
(Gbps)<br />
MaxBW<br />
/<br />
slot<br />
Dedicate<br />
d Rate<br />
mode<br />
Supporte<br />
d<br />
16 port 2<br />
Line<br />
Gbps<br />
32 port 2<br />
4 4 10 2rate<br />
No No<br />
Gbps 4 8 5 2 40No No<br />
20 port 2<br />
Gbps<br />
40 port 2<br />
4 5 5 2 20No No<br />
Gbps 4 10 5 2 40No No<br />
Shared<br />
rate mode<br />
supported<br />
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22
Gen-2 <strong>Oversubscription</strong> Ratios<br />
Switching<br />
Module<br />
Type<br />
Configured<br />
Speed<br />
Ratio<br />
Enabled<br />
Maxim<br />
Ratio um Switching<br />
DisablBW<br />
Module<br />
ed Gbps Type<br />
Configu<br />
red<br />
Speed<br />
Ratio<br />
Enable<br />
d<br />
Ratio<br />
Disabled<br />
Maximum<br />
BW Gbps<br />
48 <strong>Port</strong> Auto 4 0.8 0.09 448 <strong>Port</strong> Auto 4 0.8 0.09 4<br />
Auto 2 0.4 0.045<br />
0.022<br />
2 Auto 2 0.4 0.045 2<br />
1Gbps 0.2 5 1 1Gbps 0.2 0.0225 1<br />
24 port Auto 4 1 0.27 424 port Auto 4 1 0.27 4<br />
Auto 2 0.5 0.135 2 Auto 2 0.5 0.135 2<br />
1 Gbps 0.25 0.067 1 1 Gbps 0.25 0.067 1<br />
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23
Gen-2 Configuration Scenarios<br />
Module<br />
4 GB<br />
Dedicated<br />
2 GB<br />
Dedicated<br />
<strong>Port</strong>s must pass<br />
some traffic<br />
<strong>Port</strong>s out-ofservice<br />
Oversubscrip<br />
tion Ratio<br />
9513-<br />
Module 6 17-18,22-24 None 13-16,19-21 None As required<br />
9513-<br />
Remaining ports<br />
Module 5 1-3,7-8<br />
9513-<br />
None None in groups 1 and 2 As required<br />
Module 1 none 1-12 None None As required<br />
9513-<br />
2-5,8-11,14-<br />
Module 3 1,7,13<br />
9506-<br />
17 Remaining None As required<br />
Module 1 Any 6 ports None Remaining None Default<br />
9506- 3<br />
Module 2 ports/group None Remaining None As required<br />
9506- 2<br />
2<br />
Module 3 port/group ports/group None As required As required<br />
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