4-22
Switch Meshing
Operating Notes for Switch Meshing
When static VLANs are configured, the mesh is seen as a single entity by each
VLAN. All ports in the mesh domain are members of all VLANs and can be
used to forward traffic for any VLAN. However, the non-mesh ports on edge
switches that allow traffic to move between the mesh and non-meshed devices
belong to specific VLANs and do not allow packets originating in a specific
VLAN to enter non-meshed devices that do not belong to that same VLAN. (It
is necessary to use a router to communicate between VLANs.) For example,
in the following illustration, traffic from host A entering the switch mesh can
only exit the mesh at the port for hosts B and E. Traffic from host A for any
other host (such as C or D) will be dropped because only hosts B and E are in
the same VLAN as host A.
Figure 4-16. VLAN Operation with a Switch Mesh Domain
Dynamic VLANs
If GVRP is enabled, meshed ports in a switch become members of any dynamic
VLANs created in the switch in the same way that they would if meshing was
not configured in the switch. (For more on GVRP, refer to chapter 2, “GVRP”.)
Jumbo Packets
If you enable jumbo traffic on any VLAN, then all meshed ports on the switch
will be enabled to support jumbo traffic. (On a given meshed switch, every
meshed port becomes a member of every VLAN configured on the switch.) If
a port in a meshed domain does not belong to any VLANs configured to support
jumbo traffic, then the port drops any jumbo packets it receives from other
A
B
D
E
C
Switch Mesh Domain
Red
VLAN
Red
VLAN
Red VLAN
Red VLANRed VLAN
Blue
VLAN
Blue
VLAN
Blue VLAN
Blue VLANBlue VLAN
(Red VLAN)
(Red VLAN)
(Red VLAN)
(Blue VLAN)
(Blue VLAN)
All ports the mesh domain are members of all VLANs.inside
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