Configuring The Jumbo Frame Feature - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Chapter 4 Configuring Ethernet, Fast Ethernet, and Gigabit Ethernet Switching

Configuring the Jumbo Frame Feature

These sections describe the jumbo frame feature:
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Configuring the Jumbo Frame Feature on the Supervisor Engine
When you enable the jumbo frame feature on a port, the port can switch large (or jumbo) frames. This
feature is useful in optimizing server-to-server performance. The default maximum transmission unit
(MTU) frame size is 1548 bytes for all Ethernet ports. By enabling the jumbo frame feature on a port,
the MTU size is increased to 9216 bytes.
To enable the jumbo frame feature on a per-port basis, follow these guidelines:
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Note Occasionally, you might see a "Jumbo frames inconsistent state" message for a port or multiple ports
after entering the show port jumbo command. If this occurs, enter the set port jumbo command to
reenable the ports.
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Configuring the Jumbo Frame Feature on the Supervisor Engine, page 4-11
Configuring the Jumbo Frame Feature on MSFC2, page 4-12
The jumbo frames feature is supported on the following:
Ethernet ports
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Note The following modules only support a maximum of 8092 bytes: WS-X6148-RJ-45V,
WS-X6148-RJ21V, WS-X6248-RJ-45, WS-X6248A-RJ-45, WS-X6248-TEL,
WS-X6248A-TEL, WS-X6348-RJ-45, WS-X6348-RJ45V, WS-X6348-RJ-21, and
WX-X6348-RJ21V.
The WS-X6548-RJ-21 and WS-X6548-RJ-45 modules use different hardware at the
PHY level and support the full jumbo frame default value of 9216 bytes.
Note The WS-X6516-GE-TX (10/100/1000) module only supports a maximum of 8092 bytes
at the 100 Mbps speed. At 10 Mbps and 1000 Mbps the module supports the jumbo frame
default of 9216 bytes.
Trunk ports
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EtherChannels
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Jumbo frames are supported on all Optical Services Modules (OSMs).
Jumbo frames are not supported on ATM modules (WS-X6101-OC12-SMF/MMF).
The Multilayer Switching Feature Card 2 (MSFC2) supports routing of jumbo frames.
The Gigabit Switch Router (GSR) supports routing of jumbo frames.
The Multilayer Switching Feature Card (MSFC) and Multilayer Switch Module (MSM) do not
support jumbo frame routing; if jumbo frames are sent to these routers, router performance is
significantly degraded.
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Setting the Port Configuration
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