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NetEngine IAD User Guide
Router Configuration 109
Setting the
Port
Maximum
Transmis-
sion Unit
The MTU setting controls IP fragmentation of packets transmitted through
the specified port. Packet whose size is greater than the MTU value are
fragmented to fit into the MTU size limit.
To set a maximum transmission unit value for a port, follow these steps:
1. Type M on the Router Configuration menu to select Configure Port Max
Transmission Unit.
1. The IAD displays the port table for this interface and prompts for a port.
Port VPI VCI Encapsulation Type PCR Service
1 0 40 RFC 1483 (with LLC Encap)3641 UBR
Total = 3641 cps
Maximum PCR this interface can support = 3622 cps
Select Port: [1-8]
Type the port number and press Enter.
2. The IAD displays the current configuration and a prompt:
Current MTU configuration for SDSL, Port 1 is 1500.
Enter New MTU for this Port >
Type the new MTU value (100-1500) and press Enter. (When set at
1500, IP fragmentation is disabled).
3. The IAD saves the changes.
4. Continue with other configuration tasks, or press Escape to return to
the Router Configuration menu.
5. Reset the IAD (page 15) when you finish router configuration.