4.2 SVF
4.2.1 Which CE Series Switch Models and Versions Support SVF?
SVF System of Fixed Switches
SVF System of Modular and Fixed Switches
| Version | Parent Switch Model | Leaf Switch Model | Remarks |
|---|---|---|---|
| V100R005C00 |
|
| |
V100R005C10 |
|
| |
V100R006C00 V200R001C00 V200R002C01 V200R002C10 V200R002C20 V200R002C50 V200R003C00 |
|
|
4.2.2 How Do I Load a License for SVF?
Apply for a license and upload the license file to the parent switch.
You only need to apply for a license for the parent switch. If the parent switch is a standalone device, use its ESN to apply for a license. If it is a stack of two devices, use the ESNs of the two devices to apply for a shared license or use each ESN to apply for a license.
Run the license active file-name command in the user view to activate the uploaded license file.
- If there are multiple license files, run the license active file-name command multiple times and specify different license file names. The system will then find the matching ESN to activate the license files.
- If there is only one license file, run the license active file-name command once.
Run the display license command to check whether a license file has been loaded.
4.2.3 How Do I Load Patches for SVF?
Upload a patch file to the parent switch. The patch file must match the parent switch model.
Run the patch load filename all run command in the user view to load and run patches.
Run the display patch-information verbose command to check whether patches are loaded successfully.
4.2.4 Can CE12800s Have SVF Configured After They Set Up a Stack?
The stacking and SVF functions are mutually exclusive on CE12800s and cannot be configured together. Therefore, after CE12800s set up a stack, SVF cannot be configured on the CE12800s.
4.2.5 Can CE6800s Have SVF Configured After They Set Up a Stack?
When a CE6800 functions as the parent switch, it can have SVF configured after setting up a stack; however, the stack can contain at most two member switches.
If a CE6800 functions as a leaf switch, it cannot set up a stack.
4.2.6 Can Leaf Switches in an SVF System Be Different Models?
In an SVF system of modular and fixed switches, leaf switches can be different models.
In an SVF system of fixed switches running V100R005C10 or later versions, leaf switches can be different models. In V100R005C00 and earlier versions, leaf switches must be the same series. For example, CE5810-48T4S-EI and CE5810-24T4S-EI can belong to the same SVF system, but CE6810-48S4Q-EI and CE5810-48T4S-EI cannot belong to the same SVF system.
4.2.7 What Advantages and Disadvantages Do SVF Forwarding Modes Provide?
Centralized forwarding: Leaf switches send all traffic to the parent switch for forwarding.
Distributed forwarding, Leaf switches look up local forwarding entries to forward traffic. If they fail to find matching entries for Layer 3 traffic, they discard the traffic. If they fail to find matching entries for Layer 2 traffic, they broadcast the traffic within the SVF system.
Hybrid forwarding: Leaf switches learn only local ARP and MAC address entries. (Only service ports learn entries, while ports connecting to the parent switch do not learn entries). They send broadcast and multicast traffic to the parent switch for forwarding and look up local forwarding entries to forward unicast traffic. If they fail to find the matching entries, they send unicast traffic to the parent switch for forwarding.
Forwarding Mode | Advantage | Disadvantage |
|---|---|---|
Centralized forwarding | Leaf and parent switches have the same entry specifications; therefore, low-cost leaf switches can be deployed. | Leaf switches need to send all traffic to the parent switch for forwarding, leading to a high latency. |
Distributed forwarding | Leaf switches forward local traffic, achieving a low latency. | The entry specifications of leaf switches depend on the specifications of leaf switches. Therefore, some functions are not supported on leaf switches. |
Hybrid forwarding | Leaf and parent switches have the same entry specifications; therefore, low-cost leaf switches can be deployed. Leaf switches forward local traffic instead of sending traffic to the parent switch for forwarding, achieving a low latency. | - |
4.2.8 Can the Parent and Leaf Switches in an SVF System Be Connected Across Switches That Transparently Transmit Packets?
No, they cannot because the parent and leaf switches must be directly connected.
4.2.9 How Do I Restart a Leaf Switch in an SVF System?
- In an SVF system of fixed switches, run the reset slot slot-id command to restart the specified leaf switch.
- In an SVF system of modular and fixed switches, run the reset chassis chassis-id command to restart the specified leaf switch.
slot-id or chassis-id specifies the ID of a leaf switch.
4.2.10 What Will Happen to a Leaf Switch After It Is Removed from an SVF System?
After a leaf switch is removed from an SVF system, this leaf switch repeatedly restarts in leaf mode until it joins this or another SVF system or until an administrator logs in to it through a console port to restore it to the normal working mode.
