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  1. Senior Member
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    #1

    Default portfast edge and portfast network???

    Hey all,
    Haven't posted here in forever, but thought I'd run this one by everyone. On a Cisco 6509, I have options for 'spanning-tree portfast edge', and 'spanning-tree portfast network'. There's also a 'disable' option but that's obvious. My question is, what's the difference between 'edge' and 'network' and in what situations would you use one or the other?

    I also have a couple TRUNK interfaces that have 'spanning-tree portfast edge' enabled on them, but when I do a 'show spanning-tree int gig 12/blah portfast' on it, it shows disabled for all VLANs. So it doesn't appear to be doing anything.


    Thanks for your help!

    Jared
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  3. Junior Member
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    #2
    You would enable portfast edge on access/host ports for the port to bypass the listening/learning states and immediately go into forwarding state.

    You use the portfast network on trunk ports to enable bridge assurance feature which pretects against loops by detecting unidirectional links in the STP topology. But normally bridge assurance is enabled by default. This is only supported in the 12.2(33)SXI and later releases.

    More details on STP features for 6500 linky
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  4. Junior Member
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    #3
    You would enable portfast edge on access/host ports for the port to bypass the listening/learning states and immediately go into forwarding state.

    You use the portfast network on trunk ports to enable bridge assurance feature which pretects against loops by detecting unidirectional links in the STP topology. But normally bridge assurance is enabled by default. This is only supported in the 12.2(33)SXI and later releases.
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  5. M&C: Far Side of the Net vinbuck's Avatar
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    CSA (Certified Sandwich Artist - Retired), MCP, CCNP, CCNA, MTCNA, MTCRE, MTCTCE, HE IPv6 Enthusiast
    #4
    So is the functionality the same on 'portfast network' as opposed to 'portfast trunk' ?
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  6. Junior Member
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    #5
    My understanding, you'll only use 'portfast trunk' when connecting a trunk port to a server which needs 802.1q and you want fastport edge behavior . But you can use 'portfast network' feature on trunk port between two switches to enable 'bridge assurance'
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  7. Junior Member Registered Member
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    Nov 2014
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    #6
    Hey mates,

    Normal portfast command has been replaced with portfast edge.

    Portfast trunk has been replaced with portfast edge trunk.

    Portfast network command is a new command which is used with Bridge Assurance feature which is just a replacement of UDLD (for Unidirectional Links Detection)

    But I have no idea what that "portfast normal" this is for.

    HTH
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