Table of Contents
Advertisement
Configuring Flex Links
Figure 20-1 Flex Links Configuration Example
Uplink
switch B
If a primary (forwarding) link goes down, a trap notifies the network management stations. If the standby
link goes down, a trap notifies the users.
Flex Links are supported only on Layer 2 ports and port channels, not on VLANs or Layer 3 ports.
Configuring Flex Links
This section includes these guidelines and procedures for configuring Flex Links:
•
•
•
Default Flex Link Configuration
By default, Flex Links are not configured, and there are no backup interfaces defined.,
Flex Link Configuration Guidelines
Follow these guidelines to configure Flex Links:
•
•
•
•
•
Catalyst 3750 Switch Software Configuration Guide
20-2
Port 1
Default Flex Link Configuration, page 20-2
Flex Link Configuration Guidelines, page 20-2
Configuring Flex Links, page 20-3
You can configure only one Flex Link backup link for any active link, and it must be a different
interface from the active interface.
An interface can belong to only one Flex Link pair. An interface can be a backup link for only one
active link. An active link cannot belong to another Flex Link pair.
Neither of the links can be a member of an EtherChannel. However, you can configure two port
channels as Flex Links, and you can configure a port channel and a physical interface as Flex Links,
with either the port channel or the physical interface as the active link.
A backup link does not have to be the same type (Fast Ethernet, Gigabit Ethernet, or port channel)
as the active link. However, you should configure both Flex Links with similar characteristics so that
there are no loops or changes in behavior if the standby link begins to forward traffic.
STP is disabled on Flex Link ports. If STP is configured on the switch, Flex Links do not participate
in STP in all VLANs in which STP is configured. With STP not running, be sure that there are no
loops in the configured topology.
Port 2
Switch A
Chapter 20
Configuring Flex Links
Uplink
switch C
78-16180-02
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
