Planning Member Devices of an SVF System

After determining networking of an SVF system, you need to select member devices for the SVF system.

Determining the Parent

Determine the parent device type.

The parent device type is determined by the campus network scale. For details, see Determining Campus Network Scenarios.
Determine the number of devices for the parent.
1. The parent manages and maintains the entire SVF system. You are advised to deploy a CSS of two modular switches as the parent to ensure reliability of the SVF system.
2. S9703, S7703 PoE, and S7703 do not support the CSS function, and S5720-HI in V200R008C00 and earlier versions does not support the stack function. If your campus network requires high reliability, these switch models are not recommended as the parent.
Determine the card type on the parent.
1. In a wired and wireless convergence scenario, you need to deploy X series cards on the parent.
2. If an AS needs to connect to two LPUs of the parent, you are advised to connect the AS to LPUs of the same type.
3. If the campus network provides only wired access and does not require access authentication, you do not need to deploy X series cards on the parent. If access terminals need to be authenticated, you are advised to deploy X series cards on the parent because X series cards support a large number of user entries and allow more flexible access control policies.
4. You need to use optical interface cards to connect the parent to ASs because uplink ports of most AS types are optical ports. If an AS uses a 10GE optical port to connect to a GE port of the parent, the 10GE optical port must be able to switch to the GE mode through auto sensing.
5. If the parent connects to ASs only through twisted pairs, you are advised to use ASs with uplink combo ports to connect to the electrical interface cards of the parent. Otherwise, you need to use copper modules to ensure the connectivity between ASs and the parent.

Determining ASs

Select level-1 and level-2 ASs according to the following requirements:

ASs can connect to the parent only through uplink ports, and uplink ports of most ASs are optical ports. Therefore, when an SVF system has two levels of ASs, use ASs with downlink optical ports as level-1 ASs. Otherwise, you need to use copper modules to ensure the connectivity between level-1 and level-2 ASs.
When services in an SVF system are similar, use ASs of the same type so that faulty ASs can be replaced.

Select ASs according to hardware characteristics and the following table to meet different networking requirements.

**Table 1** Recommended AS types in different networking modes
Networking	Device Positioning	Recommended Device Type
Two levels of ASs exist, and level-1 ASs are directly connected to the parent	Level-1 AS	S6720-EI, S6720S-EI, S6720-SI, S6720S-SI, S6730-H, S6730S-H, S5730-HI, S5731-H, S5731S-H, S5732-H, S5720-EI with downlink optical ports
	Level-2 AS	S6730-S, S6730S-S, S6720-LI, S6720S-LI, S6720-SI, S6720S-SI, S5700-LI with uplink GE optical ports, S5700S-LI, S5730-SI, S5730S-EI, S5720-LI, S5735-L, S5735S-L, S5735S-L-M, S5720S-LI, S2750-EI, S2720-EI, S5720-SI, S5735-S, S5735S-S, S5735-S-I, S5720S-SI, S5720I-SI, S5710-X-LI, S5731-S, S5731S-S, S600-E
ASs are directly connected to the parent	AS	S6720-LI, S6720S-LI, S6720-SI, S6720S-SI, S6720-EI, S6720S-EI, S6730-S, S6730S-S, S5720-EI, S5700-LI, S5700S-LI, S6730-H, S6730S-H, S5730-HI, S5731-H, S5731S-H, S5732-H, S5731-S, S5731S-S, S5730-SI, S5730S-EI, S5720-LI, S5735-L, S5735S-L, S5735S-L-M, S5720S-LI, S2750-EI, S2720-EI, S5720-SI, S5735-S, S5735S-S, S5735-S-I, S5720S-SI, S5720I-SI, S5710-X-LI, S600-E
ASs are connected to the parent across an intermediate network	AS	S6720-LI, S6720S-LI, S6720-SI, S6720S-SI, S6720-EI, S6720S-EI, S6730-S, S6730S-S, S5720-EI, S5700-LI, S5700S-LI, S6730-H, S6730S-H, S5730-HI, S5731-H, S5731S-H, S5732-H, S5731-S, S5731S-S, S5730-SI, S5730S-EI, S5720-LI, S5735-L, S5735S-L, S5735S-L-M, S5720S-LI, S2750-EI, S2720-EI, S5720-SI, S5735-S, S5735S-S, S5735-S-I, S5720S-SI, S5720I-SI, S5710-X-LI, S600-E
	Devices that do not join the SVF system (intermediate network devices)	Devices with downlink optical ports and supporting Eth-Trunk

Determining APs

You need to select APs that are supported by the parent. First, use the following methods to check whether the AP types are supported by the parent:

(Recommended) Run the display ap-type all command on the parent to check the AP types currently supported.
Check the version mapping of the device model for the parent to check the AP types supported by the parent.