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25-17
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 25 Configuring ATM Router Module Interfaces
Configuring Jumbo Frames
Jumbo frame support is only available on the following enhanced ATM router module and the two-port
enhanced Gigabit Ethernet modules:
• C8540-ARM2—enhanced ATM Router Module with 64K, 128K, and 256K routing table entries
• C85EGE-2X-16K—two-port enhanced Gigabit Ethernet module with 16K routing table entries
• C85EGE-2X-64K—two-port enhanced Gigabit Ethernet module with 64K routing table entries
• C85EGE-2X-256K—two-port enhanced Gigabit Ethernet module with 64K routing table entries
Note Only these hardware revisions have an ASIC that supports changing the MTU value.
To configure the jumbo frames perform the following steps, beginning in global configuration mode:
Example
The following is an example of how to configure the MTU on the enhanced ATM router module interface
to 9218 bytes:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z
Router(config)# interface atm 12/0/0
Router(config-if)# mtu 9218
Displaying the Interface MTU Configuration
To show the interface MTU configuration, use the following EXEC commands:
Examples
In the following example, the show interface atm command output shows that the MTU configuration
was changed on the interface ATM 12/0/0:
Switch# show interface atm 12/0/0
ATM12/0/0 is up, line protocol is up
Hardware is arm2_port, address is 0090.2141.b077 (bia 0090.2141.b077)
SVC idle disconnect time: 300 seconds
MTU 9218 bytes, sub MTU 17976, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Command Purpose
Step 1
Switch(config)# interface atm card/subcard/port
Switch(config-if)#
Specifies the enhanced ATM router module or
enhanced Gigabit Ethernet interface to
configure.
Step 2
Switch(config-if)# mtu bytes Adjust the maximum packet size or MTU size.
Command Purpose
show atm interface [atm
card/subcard/port[.vpt#]]
Shows the ATM interface configuration.