Interface Configuration
7750 SR OS Interface Configuration Guide
Page 91
MTU Configuration Guidelines
Observe the following general rules when planning your service and physical MTU
configurations:
•
The 7750 SRmust contend with MTU limitations at many service points. The physical
(access and network) port, service, and SDP MTU values must be individually defined.
•
Identify the ports that will be designated as network ports intended to carry service traffic.
•
MTU values should not be modified frequently.
•
MTU values must conform to both of the following conditions:
→
The service MTU must be less than or equal to the SDP path MTU.
→
The service MTU must be less than or equal to the access port (SAP) MTU.
Default MTU Values
displays the default MTU values which are dependent upon the (sub-) port type, mode,
and encapsulation.
*The default MTU for Ethernet ports other than Fast Ethernet is actually the lesser of 9212 and
any MTU limitations imposed by hardware which is typically 16K.
Table 18: MTU Default Values
Port Type
Mode
Encap Type
Default
(bytes)
Ethernet access
null
1514
Ethernet access
dot1q
1518
Fast Ethernet
network
—
1514
Other Ethernet
network
—
9212*
SONET path or TDM channel
access
BCP-null
1518
SONET path or TDM channel
access
BCP-Dot1q
1522
SONET path or TDM channel
access
IPCP
1502
SONET path or TDM channel
network
—
9208
SONET path or TDM channel
access
frame-relay
1578
SONET path or TDM channel
access
atm
1524
Содержание 7750 SR OS
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Страница 10: ...Page 10 7750 SR OS Interface Configuration Guide List of Figures ...
Страница 14: ...Preface Page 14 7750 SR OS Interface Configuration Guide ...
Страница 16: ...Getting Started Page 16 7750 SR OS Interface Configuration Guide ...
Страница 184: ...Card MDA and Port Command Reference Page 184 7750 SR OS Interface Configuration Guide ...
Страница 417: ...Interface Configuration 7750 SR OS Interface Configuration Guide Page 417 4 5 SAP PVT 1 1 up up A ima2 ...
Страница 429: ...Interface Configuration 7750 SR OS Interface Configuration Guide Page 429 Cells 0 0 Unknown VPI VCI Cells 0 A ALA 49 ...
Страница 437: ...Interface Configuration 7750 SR OS Interface Configuration Guide Page 437 bundle num 1 256 type ppp ...
Страница 438: ...Debug Commands Page 438 7750 SR OS Interface Configuration Guide ...
Страница 444: ...Index Page 444 7750 SR OS Interface Configuration ...