Vlan Trunking - Edge-Core ECS4810-12M Layer 2 Management Manual

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Use the Interface > VLAN Trunking page to allow unknown VLAN groups to

pass through the specified interface.

"vlan-trunking" on page 944

Use this feature to configure a tunnel across one or more intermediate

switches which pass traffic for VLAN groups to which they do not

The following figure shows VLANs 1 and 2 configured on switches A and

B, with VLAN trunking being used to pass traffic for these VLAN groups

across switches C, D and E.

Figure 60: Configuring VLAN Trunking

Without VLAN trunking, you would have to configure VLANs 1 and 2 on

all intermediate switches – C, D and E; otherwise these switches would

drop any frames with unknown VLAN group tags. However, by enabling

VLAN trunking on the intermediate switch ports along the path

connecting VLANs 1 and 2, you only need to create these VLAN groups

in switches A and B. Switches C, D and E automatically allow frames

with VLAN group tags 1 and 2 (groups that are unknown to those

switches) to pass through their VLAN trunking ports.

VLAN trunking is mutually exclusive with the "access" switchport mode

"Adding Static Members to VLANs" on page

is enabled on an interface, then that interface cannot be set to access

mode, and vice versa.

To prevent loops from forming in the spanning tree, all unknown VLANs

will be bound to a single instance (either STP/RSTP or an MSTP

instance, depending on the selected STA mode).

If both VLAN trunking and ingress filtering are disabled on an interface,

packets with unknown VLAN tags will still be allowed to enter this

interface and will be flooded to all other ports where VLAN trunking is

enabled. (In other words, VLAN trunking will still be effectively enabled

for the unknown VLAN).

| Interface Configuration

VLAN Trunking

180). If VLAN trunking