This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

CCIE #29033

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Sunday, April 25, 2010

Question 25

What are flex links?
Posted by Packets Analyzed at 4:19 PM
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1 comments:

Packets Analyzed said...

Flex Links are a pair of layer 2 interfaces which can be a switchport or portchannel. One of the interfaces will be configured as a backup interface. This allows you to turn off spanning-tree while maintaining redundancy. STP is turned off on Flex Link interfaces.


inter fas 0/1
switchport backup interface fast 0/2

Guidance
- can configure a flex link backup on any active link (must be different from the active interface)
- interface can only belong to on flex link pair. An interface can only backup one active interface.
- No link can be a member of an etherchannel but flex links can be created between portchannels or a portchannel and an interface
- You should configure a flex link with the same type (fast, gig and so on) although this is not required.
-STP does not run on flexlinks.


show interface switchport backup

April 28, 2010 at 10:43 PM

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