RTS DV-3400 Informações Técnicas descarregar pdf (Página 352)

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Port Traffic Controls

Jumbo Packets on the Series 3400cl and Series 6400cl Switches

■ 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

packets they receive from other devices. In this regard, if a mesh domain

includes any ProCurve Series 5300xl switches and/or ProCurve 1600M/

2400M/2424M/4000M/8000M switches along with Series 3400cl and Series

6400cl switches configured to support jumbo traffic, only the 3400cl/

6400cl switches will receive jumbo packets. The other switch models in

the mesh will drop such packets. For more information on switch mesh-

ing, refer to the chapter titled “Switch Meshing” in the Advanced Traffic

Management Guide for your switch.

Troubleshooting

A VLAN is configured to allow jumbo packets, but one or more ports

drops all inbound jumbo packets. The port may not be operating at 1

gigabit or higher. Regardless of a port’s configuration, if it is actually operating

at a speed lower than 1 gigabit, it drops inbound jumbo packets. For example,

if a port is configured for Auto mode (speed-duplex auto), but has negotiated a

100 Mbps speed with the device at the other end of the link, then the port

cannot receive inbound jumbo packets. To determine the actual operating

speed of one or more ports, view the Mode field in the output for the following

command:

show interfaces brief < port-list >

A non-jumbo port is generating “Excessive undersize/giant packets”

messages in the Event Log. The 3400cl/6400cl switches can transmit out-

bound jumbo traffic on any port, regardless of whether the port belongs to a

jumbo VLAN. In this case, another port in the same VLAN on the switch may

be jumbo-enabled through membership in a different, jumbo-enabled VLAN,

and may be forwarding jumbo packets received on the jumbo VLAN to non-

jumbo ports. Refer to “Outbound Jumbo Traffic” on page 14-33.

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