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AS-path prepending: technical details

I thought I knew all there is to know about the AS-path prepending before last month’s incident, which prompted me to focus on this particular Cisco IOS feature.

For example, did you know you could do inbound AS-path prepending? I didn’t, until Rodney Dunn from Cisco mentioned it in an e-mail exchange. Did you ever wonder whether the AS-path prepending affects inbound or outbound AS-path filters? I had a hunch it doesn’t, but was never sure.

You can find everything you never wanted to know about AS-path prepending in the AS-path prepending (technical details) article in the CT3 wiki.

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