Cisco 6500 User Manual
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Cisco IOS Software Configuration Guide, Release 12.2SX
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Chapter 4 Configuring Virtual Switching Systems
Understanding Virtual Switching Systems
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mls ipx
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mls netflow
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mls rp
•
mls switching
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no
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shutdown
Note
The mls qos command is not available when a port is in VSL restricted mode.
Multichassis EtherChannel
An EtherChannel (also known as a port channel) is a collection of two or more physical links that
combine to form one logical link. Layer 2 protocols operate on the EtherChannel as a single logical
entity.
A multichassis EtherChannel (MEC) is a port channel that spans the two chassis of a VSS. The access
switch views the MEC as a standard port channel. See
The VSS supports a maximum of 512 EtherChannels. This limit applies to the combined total of regular
EtherChannels and MECs. Because VSL requires two EtherChannel numbers (one for each chassis),
there are 510 user-configurable EtherChannels. If an installed service module uses an internal
EtherChannel, that EtherChannel will be included in the total.
Note
For releases earlier than Cisco IOS Release 12.2(33)SXI, the maximum number of EtherChannels is 128,
allowing 126 user-configurable EtherChannels.
Figure 4-4
VSS with MEC
181323
VSL
Chassis 1
Chassis 2
MEC