User guide

5-6 E
XTREME
W
ARE
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OFTWARE
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SER
G
UIDE
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ONFIGURING
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UMMIT
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ORTS
The jumbo_frame_mtu range is 1523 to 9216. The value describes the maximum size
“on the wire,” and includes 4 bytes of CRC plus another 4 bytes if 802.1Q tagging is
being used.
Next, enable support on the physical ports that will carry jumbo frames, using the
following command:
enable jumbo-frame ports [<portlist | all]
Some network interface cards (NICs) have a configured maximum MTU size that
does not include the additional 4 bytes of CRC. Ensure that the NIC maximum
MTU size is at or below the maximum MTU size configured on the switch.
Frames that are larger than the MTU size configured on the switch are dropped
at the ingress port.
L
OAD
S
HARING ON THE
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UMMIT
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WITCH
Load sharing with Summit switches allows you to increase bandwidth and resilience
between switches by using a group of ports to carry traffic in parallel between switches.
The sharing algorithm allows the switch to use multiple ports as a single logical port.
For example, VLANs see the load-sharing group as a single logical port. Most
load-sharing algorithms also guarantee packet sequencing between clients.
If a port in a load-sharing group fails, traffic is redistributed to the remaining ports in
the load-sharing group. If the failed port becomes active again, traffic is redistributed to
include that port.
Load sharing must be enabled on both ends of the link, or a network loop will
result.
This feature is supported between Extreme Networks switches only, but may be
compatible with third-party “trunking” or sharing algorithms. Check with an Extreme
Networks technical representative for more information.