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Configuring Bridging
Overview
90
EtherXtend User's Guide
•
Tagged and s-tagged bridging examples on page 93
Bridges also utilize VLAN and SLAN tagging for untagged, tagged, and
s-tagged, traffic segregation.
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Untagged bridging
Untagged or transparent bridging accepts and sends traffic based on MAC
addresses but does not provide traffic segregation. Traffic is broadcast
over the Ethernet port and is either accepted or rejected based on the
destination MAC address. There is no VLAN tagging; all ports are
learning and forwarding without restriction, without broadcast
suppression. Forwarding to a default port is not allowed. If bridge
forwarding selects a single or double-tagged egress interface, the
configured VLAN and SLAN tags will be inserted in to packets destined
for this interface. Only non-zero values are recommended for VLAN and
SLAN settings of untagged bridges.
•
Tagged bridging
Tagged or Virtual LANs (VLANs) bridging, accepts single-tagged
packets based on MAC addresses and allows the segregation of a single
Ethernet network into multiple virtual network segments by mapping
packets based on the VLAN ID. If a non-zero VLAN ID is configured, the
interface accepts only tagged packets matching this VLAN ID. If a
VLAN of 0 (zero) is configured, the interface accepts all VLAN tagged
packets not matching any configured VLANs on the same interface.
A configured SLAN tag is inserted into outgoing packets when bridge
forwarding selects a double-tagged egress interface. Only non-zero SLAN
values are recommended for tagged bridges.
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s-tagged
Double-tagged or Service LANs (SLANs) bridging, accepts and sends
double-tagged traffic based on MAC addresses and allows the segregation
of a single Ethernet network into multiple virtual network segments by
mapping packets based on VLAN ID and SLAN ID. If non-zero VLAN
ID and SLAN ID are configured, the interface accepts and sends only
tagged packets matching both VLAN ID and SLAN ID. If a VLAN of 0
(zero) is configured with a non-zero SLAN ID, the interface accepts and
sends only double-tagged packets matching the SLAN and any VLAN
tagged packets not destined to another client on the same interface.
When both the VLAN and SLAN tags are zero (0), the bridge accepts all
single or double tagged packets not destined to another client on the same
interface.
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