Presentation - Cisco Knowledge Network
Presentation - Cisco Knowledge Network
Presentation - Cisco Knowledge Network
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The “Shorter Prefix” Problem• AS65000 advertises10.1.1.0/24• This is the valid originator• AS65000 doesn’t want AS65020 tobe able to reach 10.1.1.0/24• So, it marks 10.1.1.0/24 so it’s notadvertised to AS65020• AS65001 advertises a default toAS65020• Hence, AS65020 still hasreachability to 10.1.1.0/24• The only possible solution is tohave some sort of a fine grainedpolicy—honored by all parties—ona per AS pair basisAS65020AS65001AS65000© 2012 <strong>Cisco</strong> and/or its affiliates. All rights reserved. 59
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