9.24 Caveats of Redistribution

Challenges of redistribution:

• Can cause routing loops; routers could send routing information back towhere it originated, indefinitely.
• Different protocols may have incompatible routing information (seed metrics should always be set to a metric that is higher than any routes native to the redistributing protocol).
• May result in sub-optimal path selection
• Inconsistent convergence time, where one routing protocol converges faster than another

Solutions to use to mitigate those challenges:

• Distribute lists: Allow for classification/filtering of redistributed routes
• Route Maps: Allow for classification and modification of traffic when redistributing (use route maps to redistribute internal routes only, and to implement route tagging)
• Manipulation of Metrics: Through redistribution commands and route-maps
• Manipulation of Administrative Distance: Via distance command