Configuring Flex Links; Flex Links Default Configuration; Flex Links Configuration Guidelines And Restrictions - Cisco 7604 Configuration Manual

Configuring Flex Links

between port 2 (the backup link) and router C is not forwarding traffic. If port 1 goes down, port 2 comes
up and starts forwarding traffic to router C. When port 1 comes back up, it goes into standby mode and
does not forward traffic; port 2 continues to forward traffic.
Figure 11-1
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 on Layer 3 ports.
Configuring Flex Links
These sections contain this configuration information:
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Flex Links Default Configuration

There is no default Flex Links configuration.

Flex Links Configuration Guidelines and Restrictions

When configuring Flex Links, follow these guidelines and restrictions:
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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
11-2
Flex Links Configuration Example
B
Port 1
A
Flex Links Default Configuration, page 11-2
Flex Links Configuration Guidelines and Restrictions, page 11-2
Configuring Flex Links, page 11-3
You can configure only one Flex Links 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 Links pair. An interface can be a backup link for only one
active link. An active link cannot belong to another Flex Links pair.
Neither of the links can be a port that belongs to an EtherChannel. However, you can configure two
port channels (EtherChannel logical interfaces) 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.
C
Port 2
Chapter 11 Configuring Flex Links
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