8-26
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL-30933-01
Chapter 8 Configuring Interfaces
Configuring Optional Interface Features
Configuring Jumbo Frame Support
These sections describe jumbo frame support:
• Ports and Modules That Support Jumbo Frames, page 8-26
• Jumbo Frame Support, page 8-26
• Configuring MTU Sizes, page 8-28
Ports and Modules That Support Jumbo Frames
The following ports and modules support jumbo frames:
• Supervisor uplink ports
• WS-C4500X ports
• WS-X4306-GB: all ports
• WS-X4232-GB-RJ: ports 1-2
• WS-X4418-GB: ports 1-2
• WS-X4412-2GB-TX: ports 13-14
• WS-X4506-GB-T
• the 4648-GB-RJ45V
• WS-X4648-GB+RJ45V
• WS-X4648-RJ45V-E
• WS-X4648-RJ45V+E
• WS-X4706-10GE
Jumbo Frame Support
These sections describe jumbo frame support:
• Maximum Transmission Units, page 8-26
• Jumbo Frame Support Overview, page 8-27
• Ethernet Ports, page 8-27
• VLAN Interfaces, page 8-28
Maximum Transmission Units
The Catalyst 4500 series switch allows you to configure a maximum of 32 different maximum
transmission unit (MTU) sizes system wide. This means that the maximum number of different MTU
sizes that you can configure with the system mtu, mtu, ip mtu, and ipv6 mtu command on all Layer 2
and Layer 3 interfaces combined is 32.
Also, the system stores the IPv4 and IPv6 MTU sizes configured on an interface separately. For every
system mtu command or per interface mtu command, two separate MTU values are stored, one for IPv4
and one for IPv6. This further reduces the number of slots available (out of 32). However, only a single
MTU value is stored for each ip mtu and ipv6 mtu commands.
If the new MTU value you are configuring is already present in the system (that is, configured on some
other interface), then no new slot(s) are allocated to store it again.
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