2 comments on “Problems with BGP Prepending

  1. I know this is a really old post, but another device that has similar behavior (specifying “number of times to prepend my own AS” rather than allowing you to just write your own path) is the Palo Alto firewall/router-on-steroids.

    Thankfully, PA only allows you to go up to 255 in the field (at least in their GUI config), so even though their documentation sucks and doesn’t explain the feature, it does at least work correctly. 🙂

  2. Thanks for the update, Braden. I think you’re right – for most users, the PA box would be unlikely to mess things up if a distracted operated just plumbed their AS number in. We just have to hope that the minority with such low-numbered vanity AS numbers have their wits about them if they use one of these boxes!

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