Thanks for the reply. I am aware of three options for dual active detection
*Enhanced PAgP - requires selected switches with specific IOS versions
on the other end to work
*BFD
*Fast Hello
I understand that if using ePAgP as the dual active detection method
then running PAgP on channels is required. Not everyone will select
this method (I have selected Fast Hello).
I don't believe the section of the best practice guide below relates
directly to dual-active detection as LACP is presented as a recommended
option. Any other ideas for why explicit trunks are not recommend are
welcome.
Ivan
Cisco Best Practice will be use PAgP if you want to like to avoid VSS
dual active scenario (better than BFD)
On Thu, Aug 6, 2009 at 1:50 AM, Ivan <[email protected]
<mailto:[email protected]>> wrote:
Cisco VSS best practice document states
Recommendations
* Always run L2 or L3 MEC.
* Do not use on and off options with PAgP or LACP or Trunk
protocol negotiation.
o PAgP — Run Desirable-Desirable with MEC links.
o LACP — Run Active-Active with MEC links.
o Trunk — Run Desirable-Desirable with MEC links.
http://www.cisco.com/en/US/products/ps9336/products_tech_note09186a0080a7c837.shtml
There is not really any explanation of the reasoning behind these
recommendations. If anyone can explain the rational that would be
great.
I would also be interested to hear what settings people are using in
production, why and how that is going.
Generally in non VSS setups I have found setting links explicitly
to trunk
mode and as etherchannel members has been reliable and would like to
understand why they are not recommended above.
Thanks
Ivan
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