Multichassis Etherchannel Restrictions And Guidelines - Cisco Catalyst 4500 series Administration Manual

Configuring a VSS

Multichassis EtherChannel Restrictions and Guidelines

When configuring MECs, note the following guidelines and restrictions:
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Dual-Active Detection Restrictions and Guidelines
When configuring dual-active detection, note the following guidelines and restrictions:
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Configuring a VSS
These sections describe how to configure a VSS:
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Configuring Easy VSS
Beginning with Cisco IOS XE 3.6.0E (IOS 15.2(2)E), the Catalyst 4500 series switch supports Easy
VSS, which enables you to configure VSS with a single command on the active switch and no action on
the VSS standby switch.
The active switch can gather information from all switches that are Layer 3 reachable.
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
5-30
Port Security over EtherChannels is not supported.
All links in an MEC must terminate locally on the VSS Active or VSS Standby switch of the same
virtual domain.
An MEC can be connected to another MEC on a different VSS domain.
Policers applied on an MEC are applied on two switches independently; if a policer is applied for
100 Mbps of conforming action, it will apply 100Mbps on both switches, resulting in a total
conforming rate of 200 Mbps. To mitigate this, you can reduce the policer rate. In a more restrictive
case, a rate of 50 Mbps might be necessary to achieve a maximum of 100Mbps. In a more liberal
case, where conforming action of 200 Mbps is not a problem, policing rate could be kept to
100Mbps.
For line redundancy, we recommend configuring at least two ports per switch for dual-active
detection. For module redundancy, the two ports can be on different modules in each switch, and
should be on different modules than the VSL ports, if feasible.
Only trusted PAgP channels are relied upon to detect dual-active mode of operation.
Configuring Easy VSS, page 5-30
Converting to a VSS, page 5-32
Displaying VSS Information, page 5-38
Converting a VSS to Standalone Switch, page 5-39
Configuring VSS Parameters, page 5-41
Configuring Multichassis EtherChannels, page 5-47
Configuring Dual-Active Detection, page 5-51
Chapter 5 Configuring Virtual Switching Systems
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