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VLAN Use Precautions

Latest reply: Jan 12, 2017 12:01:44 1214 1 0 0 0
  • You are advised to plan service and management VLANs so that any broadcast storms in service VLANs do not affect switch management.
  • In practice, specify VLANs from which packets need to be transparently transmitted by a trunk interface. Do not use the port trunk allow-pass vlan all command if possible.
  • All interfaces join VLAN 1 by default. When unknown unicast, multicast, or broadcast packets of VLAN 1 exist on the network, broadcast storms may occur. When VLAN 1 is used, pay attention to the following points:
    • Remove the interfaces that do not need to join VLAN 1 from VLAN 1 to prevent loops. A trunk interface often permits packets from VLAN 1 to pass through. If a trunk interface rejects packets from VLAN 1, some protocol packets such as BPDUs transmitted in VLAN 1 may be incorrectly discarded. To prevent such faults, take measures to prevent potential risks when packets of VLAN 1 are allowed to pass through.
    • If a spanning tree protocol is used and a trunk interface on the switch rejects packets from VLAN 1, run the stp bpdu vlan command to enable the switch to encapsulate the specified VLAN ID in outgoing STP BPDUs so that the spanning tree protocol runs properly.
    • You are advised to remove interfaces from VLAN 1 in Eth-Trunk or ring networking.
    • When the switch connects to an access device, to prevent broadcast storms in VLAN 1, do not configure the uplink interface of the access device to transparently transmit packets from VLAN 1.
    • When an interface is bound to a VLANIF interface for Layer 3 forwarding, remove the interface from VLAN 1 to prevent Layer 2 loops in VLAN 1.

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Created Jan 12, 2017 12:01:44

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