Cisco 6500 - Manual (Page 28)

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Cisco IOS Software Configuration Guide, Release 12.2SX
OL-13013-06
Chapter 4 Configuring Virtual Switching Systems
VSS Configuration Guidelines and Restrictions
Multichassis EtherChannel Restrictions and Guidelines
When configuring MECs, note the following guidelines and restrictions:
• All links in an MEC must terminate locally on the VSS active or VSS standby chassis of the same
virtual domain.
• For an MEC using the LACP control protocol, the minlinks command argument defines the
minimum number of physical links in each chassis for the MEC to be operational.
• For an MEC using the LACP control protocol, the maxbundle command argument defines the
maximum number of links in the MEC across the whole VSS.
• MEC supports LACP 1:1 redundancy. For additional information about LACP 1:1 redundancy, refer
to the
“Understanding LACP 1:1 Redundancy” section on page 19-5 .
• An MEC can be connected to another MEC in a different VSS domain.
Dual-Active Detection Restrictions and Guidelines
When configuring dual-active detection, note the following guidelines and restrictions:
• If Flex Links are configured on the VSS, use PAgP dual-active detection.
• Do not configure Flex Links and BFD dual-active detection on the same VSS.
• For dual-active detection link redundancy, configure at least two ports per switch for dual-active
detection. For module redundancy, the two ports can be on different switching modules in each
chassis, and should be on different modules than the VSL, if feasible.
• When you configure dual-active fast hello mode, all existing configurations are removed
automatically from the interface except for these commands:
– description
– logging event
– load-interval
– rcv-queue cos-map
– rcv-queue queue-limit
– rcv-queue random-detect
– rcv-queue threshold
– wrr-queue bandwidth
– wrr-queue cos-map
– wrr-queue queue-limit
– wrr-queue random-detect
– wrr-queue threshold
– priority-queue cos-map
• Only these configuration commands are available on dual-active detection fast hello ports:
– default
– description
– dual-active