3com MSR 20-20 참조 매뉴얼

vt-number: Number of the virtual template (VT) interface corresponding to a 
PPPoA map.

Use the map ppp command to create a PPPoA map on the PVC.

Use the undo map ppp command to delete the map.

By default, no mapping is configured.

Before this command is used, the VT must have already been created.

The following example demonstrates a complete process of PPPoA configuration.

# Create a VT interface numbered 10, and assign it an IP address.

<Sysname> system-view

[Sysname] interface virtual-template 10

[Sysname-Virtual-Template10] ip address 202.38.160.1 255.255.255.0

[Sysname-Virtual-Template10] quit 

# Create PVC 1/101 on interface Atm1/0.

[Sysname] interface atm 1/0

[Sysname-Atm1/0] pvc 1/101 

# Create a PPPoA map using the VT interface created.

[Sysname-atm-pvc-Atm1/0-1/101] map ppp virtual-template 10 

mtu mtu-number

Interface view

mtu-number: MTU size on ATM interface, in range of 128 to 2000 bytes.

Use the mtu command to set the size of maximum transmission unit (MTU) on 
ATM interface.

Use the undo mtu command to restore the default.

By default, the MTU of an ATM interface is 1,500 bytes.

The MTU only influences the packet assembly and disassembly at IP layer at the 
ATM interface. Due to the limit of QoS queue length (for example, the default 
length of the FIFO queue is 75), MTU which is too small may cause numerous 
fragments and thus be dropped by the QoS queue. In this case, the length of the 
QoS queue can be increased appropriately. The default queue dispatching