KB.15.15

Configuring concurrent meshing and routing

Concurrent meshing and routing is only supported on the HP 5400 series and HP 8200 series

switches using these modules.

DescriptionModule

24-Port Gig-T PoE+ v2 zl ModuleJ9534A

20-Port Gig-T PoE+ / 4-port SFP v2 zl ModuleJ9535A

20-Port Gig-T PoE+ / 2-port 10-GbE SFP+ v2 zl ModuleJ9536A

24-Port SFP v2 zl ModuleJ9537A

8-Port 10-GbE SFP+ v2 zl ModuleJ9538A

24-Port 10/100 PoE+ v2 zl ModuleJ9547A

20-Port Gig-T / 2-port 10-GbE SFP+ v2 zl ModuleJ9548A

20-Port Gig-T / 4-port SFP v2 zl ModuleJ9549A

24-Port Gig-T v2 zl ModuleJ9550A

12-Port SFP / 12-port PoE+ v2 zl ModuleJ9637A

NOTE: Since concurrent meshing and routing is only supported on V2 modules, the no

allow-v1-modules configuration parameter must be set on switches that are configured for

meshing and routing.

Meshing and routing can be configured simultaneously. A packet can be routed into a mesh, or

be switched through a mesh and then routed. Two routers can be connected by mesh links, which

offers additional network topologies between routers and switches. Concurrent meshing and routing

makes it possible to implement meshing throughout a broadcast domain without the need for

additional switches or the use of another Layer 2 technology such as Spanning Tree to connect

meshing domains with routing switches.

It is important to remember that meshing provides Layer 2 load balancing only; two traffic streams

going to the same router will take the same path through the mesh as the traffic is going to the

same MAC address.

NOTE: The mesh port on a switch is tagged on all VLANs on that switch. It is recommended that

every meshed switch have the same VLANs, whether they are used or not.

Meshing routers and switches

When Router A has no ports belonging to VLAN Z, the packets arriving on Router A’s non-mesh

ports at VLAN X can be routed to VLAN Y, travel through the mesh, and arrive at Router B. After

that they can be routed from VLAN Y to VLAN Z.

172 Switch meshing