Dell SmartFabric OS10 User Guide Release 10.5.4

Configuration notes

When configuring VLAN-stacking in the service provider network, consider the following:

• In Provider Edge (PE), on the access port of stack VLAN, Spanning Tree Protocol (STP) must be disabled.
• Do not connect multiple interconnected Customer Edge (CE) devices to a single PE device. The system cannot detect this loop because STP is disabled on the PE access ports.
• The CE devices can be connected to the PE switches in VLT for redundancy.
• The PE port must be an access member of the stack VLAN in switchport access mode.
• Configure the ports between the PE and Provider Core as pure trunk ports without any access VLAN membership. This configuration is to drop any untagged or tagged (with other than configured TPID) traffic on those ports.
• When a TPID value is configured on a port, all traffic egressing the port uses this TPID value on the VLAN tags.
  NOTE:

  • If a regular VLAN is tagged to the trunk port, the traffic on that VLAN is sent out with the configured TPID value.
  • If the other end of the trunk port is not configured with the same TPID value, the traffic is classified as untagged.
• Switches in the service provider networks must be configured to handle the increase in MTU size caused by double tagging.
• IGMP snooping must be disabled on the stack VLANs.