HP 3500 Series Advanced Traffic Management Manual page 212

Switch Meshing
Operating Notes for Switch Meshing
Figure 4-14. Connecting a Switch Mesh Domain to Non-Meshed Devices
Note on the Edge-
Port Mode in MSTP
4-20
When using MSTP and interconnecting switches covered in this guide in a
mesh with switches that are not in the mesh, all the non-mesh switch ports
(as indicated in the figure above) should have the edge-port parameter dis-
abled.
MSTP should be configured on non-mesh devices that use redundant links to
interconnect with other devices or with multiple switch mesh domains. For
example:
Mesh Domain
Figure 4-15. Interconnecting Switch Mesh Domains with Redundant Links
In the above case of multiple switch meshes linked with redundant trunks
there is the possibility that spanning-tree will temporarily block a mesh link.
This is because it is possible for spanning-tree 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-
= Non-mesh Switch Ports
Non-Mesh Switch
STP
Block
STP
Block
Mesh Domain
Non-Mesh Switch