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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 4 Configuring Ethernet, Fast Ethernet, Gigabit Ethernet, and 10-Gigabit Ethernet Switching
Setting the Port Configuration
• Redundant flex links are for simple access topologies (two uplinks from a leaf node). You need to
make sure that there is a loop-free path from the wiring closet to the access network. Unlike STP,
the flex-link port is not designed to detect loops.
• Deploying STP in the core network while running flex-link redundancy on the edge is an acceptable
configuration.
• The flex links converge faster only if the directly connected link fails. Any other failure in the
network sees no improvement from the flex-link fast convergence.
Specifying the Active and Backup Ports for the Flex Links
To specify an active port and a backup port (peer) for the flex links, perform this task in privileged mode:
This example shows how to specify port 3/48 as the flex-link active port and port 3/47 as the flex-link
backup (peer) port:
Console> (enable) set port flexlink 3/48 peer 3/47
Flexlink is successfully set on the port 3/48 and 3/47
Console> (enable)
Displaying the Port Configuration of the Flex Links
To display information about the flex-link port configuration, perform this task in normal mode:
This example shows how to display information about all the flex-link ports that are configured on the switch:
Console> (enable) show port flexlink
Port State Peer port State
----- ---------- --------- ----------
3/47 linkdown 3/48 active
3/48 active 3/47 linkdown
Console> (enable)
Clearing the Port Configuration of the Flex Links
To clear the port configuration of the flex links, perform this task in privileged mode:
Task Command
Specify an active port and a backup port (peer) for
the flex links.
set port flexlink mod/port peer mod/port
Task Command
Display information about the flex-link port
configuration.
show port flexlink [mod | mod/port]
Task Command
Clear the port configuration of the flex links. clear port flexlink mod/port [peer mod/port]
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