Jumbo Packets On The Series 3400Cl And Series 6400Cl Switches - HP ProCurve 6400cl Series Management And Configuration Manual

Jumbo Packets on the Series 3400cl and
Series 6400cl Switches
This section applies only to the HP ProCurve Series 3400cl and Series 6400cl
switches.
Feature
display VLAN jumbo status
configure jumbo VLANs
The Maximum Transmission Unit (MTU) is the maximum size IP packet the
switch can receive for Layer 2 packets inbound on a port. The switch drops
any inbound packets larger than the MTU allowed on the port. On ports
operating at 10 Mbps or 100 Mbps, the MTU is fixed at 1522 bytes. However,
ports operating at 1 Gbs or 10 Gbps speeds accept forward packets of up to
9220 bytes (including four bytes for a VLAN tag) when configured for jumbo
traffic. In the 3400cl/6400cl switches you can enable inbound jumbo packets
on a per-VLAN basis. That is, on a VLAN configured for jumbo traffic, all ports
belonging to that VLAN and operating at 1 Gbs or 10 Gbps allow inbound
jumbo packets of up to 9220 bytes. (Regardless of the mode configured on a
given jumbo-enabled port, if the port is operating at only 10 Mbps or 100 Mbps,
only packets that do not exceed 1522 bytes are allowed inbound on that port.)
Terminology
Jumbo Packet: On the 3400cl/6400cl switches, an IP packet exceeding 1522
bytes in size. The maximum Jumbo packet size is 9220 bytes. (This size
includes 4 bytes for the VLAN tag.)
Jumbo VLAN: A VLAN configured to allow inbound jumbo traffic. All ports
belonging to a jumbo and operating at 1 Gbps or higher can receive jumbo
packets from external devices. If the switch is in a meshed domain, then
all meshed ports (operating at 1 Gbps or higher) on the switch will accept
jumbo traffic from other devices in the mesh.
MTU (Maximum Transmission Unit): This is the maximum-size IP packet
the switch can receive for Layer 2 packets inbound on a port. The switch
allows jumbo packets of up to 9220 bytes.
Standard MTU: On the 3400cl/6400cl switches, an IP packet of 1522 bytes in
size. (This size includes 4 bytes for the VLAN tag.)

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

Default
n/a
Disabled
Port Traffic Controls
Menu CLI
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— 13-20
Web
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