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Interface Configuration
7750 SR OS Interface Configuration Guide
Page 211
Parameters
ieee-address —
Specifies the 48-bit MAC address in the form aa:bb:cc:dd:ee:ff or aa-bb-cc-dd-ee-ff
where aa, bb, cc, dd, ee and ff are hexadecimal numbers. Allowed values are any non-broadcast,
non-multicast MAC and non-IEEE reserved MAC addresses.
mtu
Syntax
mtu
mtu-bytes
no mtu
Context
config>port>ethernet
config>port>sonet-sdh>path
config>port>tdm>ds1>channel-group
config>port>tdm>ds3
config>port>tdm>e1>channel-group
config>port>tdm>e3
Description
This command configures the maximum payload MTU size for an Ethernet port or PPP-enabled port
or sub-port and Frame Relay-enabled port or subport. The Ethernet port level MTU parameter
indirectly defines the largest physical packet the port can transmit or the far-end Ethernet port can
receive. Packets received larger than the MTU will be discarded. Packets that cannot be fragmented at
egress and exceed the MTU are discarded.
The value specified for the MTU includes the destination MAC address, source MAC address, the
Ethertype or Length field and the complete Ethernet payload. The MTU value does not include the
preamble, start of frame delimiter or the trailing CRC.
PoS channels use the MTU to define the largest PPP payload a PoS frame may contain. A significant
difference between SONET/SDH PoS channel and Ethernet physical MTU values the overhead
considered part of the framing method and the overhead considered to be part of the application using
the frame. In Ethernet, the preamble, start of frame delimiter and the CRC are considered part of the
framing overhead and not part of the frame payload. For a PoS channel, the HDLC framing overhead
is not included in the physical MTU; only the PPP and PPP payload are included. 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 (sub-)port type, mode and encapsulation and are listed in the
following table:
Type
Mode
Encap Type
Default
(Bytes)
10/100, Gig, or 10GigE
Access
null
1514
10/100, Gig, or 10GigE
Access
dot1q
1518
10/100, Gig, or 10GigE
Access
q-in-q
1522
SONET/SDH or TDM
Access
mpls
1506
SONET/SDH or TDM
Access
bcp-null
1518
Содержание 7750 SR OS
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Страница 8: ...Page 8 7750 SR OS Interface Configuration Guide List of Tables ...
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 ...