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Routing Policies and Firewall Filters

  • Concept of routing policy

  • Default routing policies

  • Import and export policies

  • Routing policy flow

  • Effect of policies on routes and routing tables

  • Policy structure and terms

  • Policy match criteria, match types, and actions

  • Firewall filter concepts

  • Filter structure and terms

  • Filter match criteria and actions

  • Effect of filters on packets

  • Unicast reverse-path-forwarding (RPF)

1. Concept of routing policy

To configure routing policies and firewall filters on a Junos device: A rough sketch of routing policy implementation.

routing policy
  • 1. Access the Junos CLI either via console, Telnet, or SSH.

  • 2. Configure the routing policy by using the "set policy-options" command and specify the match conditions, then the actions to be taken if the conditions are met.

  • 3. Configure the firewall filter by using the "set firewall family" command and specify the match conditions, then the actions to be taken if the conditions are met.

  • 4. Apply the routing policy and firewall filter to the appropriate interfaces.

  • 5. Verify the configuration by using the "show configuration" command to display the configuration and "show interfaces" command to display the packet flow.

  • 6. Monitor the performance of the routing policies and firewall filters by using the "show route" and "show firewall" commands.

Note: The specific commands and options may vary based on the version of Junos OS and the device model.

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