Route selection algorithm
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Route selection algorithm

L0 Member

Hi everyone!

 

I have a question about PA virtual router logic. For example, I have two static routes

 

0.0.0.0/0 AD 10 metric 10 next hop 1.1.1.1

0.0.0.0/0 AD 10 metric 10 next hop 2.2.2.2

 

ECMP disabled. All dynamic routing protocols are disabled.

 

Which of these two routes will be chosen and why? Does anybody know how the firewall selects the route and which parameters it uses for route selection?

1 ACCEPTED SOLUTION

Accepted Solutions

L6 Presenter

Hi @Ilya_Kuranov ,

 

Normally when the PA have multiple routes for the same destination, then firewall gives preference to the route which have lowest AD. Unless you have ECMP enabled on PA you can't add multiple routes for the same destination with same AD value. Now if you are seeing multiple route towards same destination with same AD then ECMP is enabled on the Virtual Router.

 

Hope it helps!

Mayur S.

View solution in original post

3 REPLIES 3

L6 Presenter

Hi @Ilya_Kuranov ,

 

Normally when the PA have multiple routes for the same destination, then firewall gives preference to the route which have lowest AD. Unless you have ECMP enabled on PA you can't add multiple routes for the same destination with same AD value. Now if you are seeing multiple route towards same destination with same AD then ECMP is enabled on the Virtual Router.

 

Hope it helps!

Mayur S.

View solution in original post

L4 Transporter

You're right. There is no way to create two identical static routes with the same AD with ECMP option disabled. The commit will fail.

 

Thank you!

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