Port Traffic Controls

Jumbo Frames

can occur in situations where a non-jumbo VLAN includes some ports that do not belong to another, jumbo-enabled VLAN and some ports that do belong to another, jumbo-enabled VLAN. In this case, ports capable of receiving jumbo frames can forward them to the ports in the VLAN that do not have jumbo capability.

 

 

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Non-Jumbo VLAN

Jumbo-Enabled VLAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VLAN 10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VLAN 20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Port 3 belongs to both VLAN 10 and VLAN 20. Jumbo frames received inbound on port 3 can be forwarded out the Non-Jumbo ports 4, 5, and 6.

Figure 13-14. Forwarding Jumbo Frames Through Non-Jumbo Ports

Jumbo frames can also be forwarded out non-jumbo ports when the jumbo frames received inbound on a jumbo-enabled VLAN are routed to another, non-jumbo VLAN for outbound transmission on ports that have no mem­ berships in other, jumbo-capable VLANs. Where either of the above scenarios is a possibility, the downstream device must be configured to accept the jumbo traffic. Otherwise, this traffic will be dropped by the downstream device.

■Jumbo Traffic in a Switch Mesh Domain. Note that if a switch belongs to a meshed domain, but does not have any VLANs configured to support jumbo traffic, then the meshed ports on that switch will drop any jumbo frames they receive from other devices. In this regard, if a mesh domain includes any ProCurve 1600M/2400M/2424M/4000M/8000M switches along with the switches covered in this guide configured to support jumbo traffic, only the switches covered in this guide will receive jumbo frames. The other switch models in the mesh will drop such frames. For more information on switch meshing, refer to the chapter titled “Switch Mesh­ ing” in the Advanced Traffic Management Guide for your switch.

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