HP 2910AL - Manual (Page 327)

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.
Jumbo-Enabled VLAN
VLAN 10
Non-Jumbo VLAN
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.
1 5 2 3 4 6
Figure 13-6. 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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