AS Path prepend behaviour in Palo Alto Firewall
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Created On 10/22/20 04:51 AM - Last Modified 11/05/20 01:47 AM
Question
What is the default behaviour of Palo Alto firewall when AS path prepend is configured?
Answer
- When there is no AS path prepend configured we will see the Local AS number only once in the rib-out table.
- If we configure AS path prepend value as 3 then in the rib-out table we will see AS numbers only 3 times and not 4 times.
- If we configure AS path prepend value as 1 then will see AS numbers only once in the rib-out table.
- This is an expected behaviour on Palo Alto firewalls.
- There is no RFC which explains how the AS path prepend must be implemented. Hence the implementation of the same is open interpretation