RTS DV-3400 Informações Técnicas descarregar pdf (Página 350)

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Port Traffic Controls

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

Operating Notes for Jumbo Traffic-Handling

■ ProCurve does not recommend configuring a voice VLAN to accept jumbo

packets. Voice VLAN packets are typically small, and allowing a voice

VLAN to accept jumbo packet traffic can degrade the voice transmission

performance.

■ You can configure the default, primary, and/or (if configured) the manage-

ment VLAN to accept jumbo packets on all ports belonging to the VLAN.

■ When the switch applies the default MTU (1522-bytes) to a VLAN, all ports

in the VLAN can receive incoming packets of up to 1522 bytes in length.

When the switch applies the jumbo MTU (9220 bytes) to a VLAN, all ports

in that VLAN can receive incoming packets of up to 9220 bytes in length.

A port receiving packets exceeding the applicable MTU drops such pack-

ets, causing the switch to generate an Event Log message and increment

the “Giant Rx” counter (displayed by show interfaces < port-list >).

■ The switch does not allow flow control and jumbo packet capability to

co-exist on a port. Attempting to configure both on the same port gener-

ates an error message in the CLI and sends a similar message to the Event

Log.

■ The default MTU on the 3400cl/6400cl switches is 1522 bytes (including 4

bytes for the VLAN tag). The jumbo MTU is 9220 bytes (including 4 bytes

for the VLAN tag).

■ When a port is not a member of any jumbo-enabled VLAN, it drops all

jumbo traffic. If the port is receiving “excessive” inbound jumbo traffic,

the port generates an Event Log message to notify you of this condition.

This same condition generates a Fault-Finder message in the Alert log of

the switch’s web browser interface, and also increments the switch’s

“Giant Rx” counter.

■ If you do not want all ports in a given VLAN to accept jumbo packets, you

can consider creating one or more jumbo VLANs with a membership

comprised of only the ports you want to receive jumbo traffic. Because a

port belonging to one jumbo-enabled VLAN can receive jumbo packets

through any VLAN to which it belongs, this method enables you to include

both jumbo-enabled and non-jumbo ports within the same VLAN. For

example, suppose you wanted to allow inbound jumbo packets only on

ports 6, 7, 12, and 13. However, these ports are spread across VLAN 100

and VLAN 200, and also share these VLANs with other ports you want

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