DELL S50V User Manual

SONET/SDH | 1009

Configuring Maximum Transmission Unit (MTU)

Maximum Transmission Unit is an integer value that represents the greatest number of bytes that any given 
interface on the system can handle. MTU settings allow the router to determine if a large packet needs to 
be fragmented before transmission. PPP must be enabled on a SONET interface before MTU can become 
configurable. MTU size can be changed in INTERFACE mode by entering the command 

 

10GE interfaces support LAN and WAN modes. When in WAN mode, the 10GE interface operates as a 
SONET interface. Use the 

 command in INTERFACE mode to transition a 10GE interface into 

WAN mode. 

Note that the port must be in shutdown state before the 

 command can be executed successfully. 

(

).

Note: For E-Series ExaScale systems, you must configure all the ports in a port-pipe to either WANPHY 
or non-WANPHY.  They cannot be mixed on the same port-pipe. If you configure port 3 for example to be 
a WANPHY port then ports 0-4 (same port pipe) all must be WANPHY as well.

1

Place the port in shutdown state

INTERFACE

2

Place the port in WAN mode

INTERFACE

3

Display the active/defective alarms

EXEC

interface SONET 0/0

 no shutdown

FTOS(conf-if-so-0/0)#encap ?

ppp                     PPP encapsulation                       

FTOS(conf-if-so-0/0)#encap ppp 

FTOS(conf-if-so-0/0)#mtu ?

<8-9252>                POS MTU size (default = 4506)

FTOS(conf-if-so-0/0)#ip mtu ?

<576-9230>              Interface IP MTU (default is 1500)