9-12
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 9 Configuring Interfaces
Configuring Optional Interface Features
Configuring a nondefault MTU size on a 10-Gigabit Ethernet port limits ingress and egress packets to
the global LAN port MTU size.
Configuring a nondefault MTU size on an Ethernet port limits routed traffic to the configured MTU size.
You can configure the MTU size on any Ethernet port.
Layer 3 Ethernet Ports
On a Layer 3 port, you can configure an MTU size on each Layer 3 Ethernet port that is different than
the global LAN port MTU size.
Note Traffic through a Layer 3 Ethernet LAN port that is configured with a nondefault MTU size is also
subject to the global LAN port MTU size (see the “Configuring the Global Egress LAN Port MTU Size”
section on page 9-13).
Layer 2 Ethernet Ports
On a Layer 2 port, you can only configure an MTU size that matches the global LAN port MTU size (see
the “Configuring the Global Egress LAN Port MTU Size” section on page 9-13).
VLAN Interfaces
You can configure a different MTU size on each Layer 3 VLAN interface. Configuring a nondefault
MTU size on a VLAN interface limits traffic to the nondefault MTU size. You can configure the MTU
size on VLAN interfaces to support jumbo frames.
Configuring MTU Sizes
These sections describe how to configure MTU sizes:
• Configuring MTU Sizes, page 9-12
• Configuring the Global Egress LAN Port MTU Size, page 9-13
Configuring the MTU Size
To configure the MTU size, perform this task:
When configuring the MTU size, note the following information:
Command Purpose
Step 1
Router(config)# interface {{vlan
vlan_ID
} |
{{
type
1
slot/port
} | {port-channel
port_channel_number
}
slot/port
}}
1. type = ethernet, fastethernet, gigabitethernet, tengigabitethernet, or ge-wan
Selects the interface to configure.
Step 2
Router(config-if)# mtu
mtu_size
Configures the MTU size.
Router(config-if)# no mtu
Reverts to the default MTU size (1500 bytes).
Step 3
Router(config-if)# end
Exits configuration mode.
Step 4
Router# show running-config interface
[{gigabitethernet | tengigabitethernet}
slot/port
]
Displays the running configuration.
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