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Switch Meshing
Operating Notes for Switch Meshing
Figure 14-17. Connecting a Switch Mesh Domain to Non-Meshed Devices
STP or RSTP should be configured on non-mesh devices that use redundant
links to interconnect with other devices or with multiple switch mesh
domains. For example:
Figure 14-18. Interconnecting Switch Mesh Domains with Redundant Links
In the above case of multiple switch meshes linked with redundant trunks
there is the possibility that STP or RSTP will temporarily block a mesh link.
This is because it is possible for STP or RSTP to interpret the cost on an
external trunked link to be less than the cost on a meshed link. However, if
this condition occurs, the meshed switch that has a blocked link will automat-
ically increase the cost on the external (non-meshed) link to the point where
STP or RSTP will block the external link and unblock the meshed link. This
process typically resolves itself in approximately 30 seconds.
Mesh Domain
STP
Block
STP
Block
Mesh Domain
Non-Mesh Switch
Non-Mesh Switch
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