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(5) Jumbo frames
Jumbo frame support allows a switch to forward frames whose total field size from DA (in
the MAC header) to DATA is larger than 1518 octets.
For details about frame formats, see 13.1.3 Control on the MAC and LLC sublayers. For
details about the format of tagged frames, see the format of tagged frames in 17.5 VLAN
tags. The following table describes the jumbo frame support status.
Table 13-23 Jumbo frame support status
Item
Frame size
(octets)
Reception
Sending
Legend:
Y: Supported, N: Not supported
#
See the format of frames in 13.1.3 Control on the MAC and LLC sublayers.
(6) Automatic SFP recognition (selection of media type) [AX1250S] [AX1240S]
See 13.6.2 Automatic SFP recognition (selection of media type) [AX1250S] [AX1240S].
See also 13.8.2 Notes on using SFP below because some SFP transceivers have
restrictions on the automatic media detection functionality.
13.8.2 Notes on using SFP
(1) Notes when inserting a 1000BASE-FX SFP transceiver [AX1250S]
Media type is not automatically detected on 100BASE-FX even if automatic media
detection is enabled. For 100BASE-FX, use the following settings:
Transmission speed: Fixed to 100 Mbit/s; duplex: Full duplex
Media type: Fixed to SFP
(2) Notes after 100BASE-FX is used [AX1250S]
If you use 10BASE-T, 100BASE-TX, 1000BASE-T or 1000BASE-X after using
100BASE-FX, change the following settings in the order given before starting use:
1.
Delete the speed setting (
2.
Delete the full-duplex setting (
3.
Delete the media type setting (
Frame format
#
Ethernet V2
IEEE 802.3
No tags: 1519 to
N
9234
With tags: 1523 to
9238
Y
N
Y
N
no speed
Description
#
Total field size of DA (in the MAC
header) to DATA
FCS is included.
Frames in IEEE 802.3 format are
discarded when the value of the
LENGTH field is 0x05DD (1501 octets)
or larger.
Frames in IEEE 802.3 format are not
sent.
).
no duplex
).
no media-type
).
13 Ethernet
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