Cisco Catalyst 4500 Series Software Configuration Manual page 230

Understanding Virtual Switching Systems
Figure 5-3
Chassis 1
When you configure VSL, all existing configurations are removed from the interface except for specific
allowed commands. When you configure VSL, the system puts the interface into a restricted mode. This
means that only specific configuration commands can be configured on the interface.
The following VSL configuration commands are inserted automatically on all VSL member ports:
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In VSL restricted mode, only these configuration commands are available:
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Multichassis EtherChannel
Beginning with Cisco Release IOS XE 3.5.0E and IOS 15.2(1)SG, Layer 3 MEC is supported on the
Note
Catalyst 4500 series switch. Cisco Release IOS XE 3.4.0SG does not support Layer 3 MEC.
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 VSS enables the creation of Multi-Chassis EtherChannel (MEC), which is an Etherchannel
whose member ports can be distributed across the member switches in a VSS. Because non-VSS
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
5-4
Virtual Switch Link
switchport mode trunk
switchport nonegotiate
no lldp transmit
no lldp receive
no cdp enable
service-policy output VSL-Queuing-Policy
channel-group
default
description
exit
load-interval
logging
no
power
service-policy
shutdown
Virtual switch
Virtual switch link
(VSL)
Chapter 5 Configuring Virtual Switching Systems
Chassis 2