Nokia 7705 SAR - Page 481

Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 481
Parameters access — configures the port or channel as service access
network — configures the port or channel for transport network use
mtu
Syntax mtu mtu-bytes
no mtu
Context config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
Description This command configures the maximum payload MTU size for a port.
Packets received that are larger than the MTU will be fragmented or discarded, depending
on whether the DF bit is set in the packet header. If the port mode or encapsulation type is
changed, the MTU assumes the default values of the new mode or encapsulation type.
The no form of this command restores the default values.
Default The default MTU value depends on the port type, mode, and encapsulation as listed in the
following table.
Parameters mtu-bytes — sets the maximum allowable size of the MTU, expressed as an integer
Values 512 to 2090 bytes (see Table 29)
Table 29 Default and Maximum Port MTU
Port Type Mode Encap Type Default
(Bytes)
Max MTU
(Bytes)
TDM (PW) Access cem 1514 1514
TDM (ATM PW) Access atm 1524 1524
TDM (FR PW) Access frame-relay 1514 2090
TDM (HDLC PW) Access hdlc 1514 2090
TDM (IW PW) Access cisco-hdlc 1514 2090
TDM (PPP/MLPPP) Access ipcp 1502 2090
TDM (PPP/MLPPP) Network ppp-auto 1572 2090
Serial V35 or X21
(FR PW)
Access frame-relay 1514 2090
SONET/SDH Access atm 1524 1524
SONET/SDH Network ppp-auto 1572 2090