Release 5.1, Revision 0 Copyright © 2001, Juniper Networks, Inc. Advanced Juniper Networks Routing Module 9: Static Routes & Routing Table Groups

Copyright © 2001, Juniper Networks, Inc. Objectives In this module, students will: Describe the default JUNOS Software route tables Explain the operation of rib-groups Configure static, aggregate, and generated routes Explain how route filters operate on prefixes

Copyright © 2001, Juniper Networks, Inc. Configuring Static Routes [edit] routing-options { static { defaults { static-options; } route destination-prefix{ next-hop; static-options; } Manually configured routes added to the routing table Once active, remain in the routing table until deleted Configured at the routing-options hierarchy level

Copyright © 2001, Juniper Networks, Inc. Static Routes Valid next-hop options include: – IP address – Discard – Reject – Receive – Label Switched Path – Qualified Next-hop Other options include: – Metric – BGP Community – BGP AS Path – Preference Defaults section affects all static routes

Copyright © 2001, Juniper Networks, Inc.

Static Next-Hop Options (1 of 2) IP address – Must be reachable across a directly connected interface – Interface name is OK for a point-to-point link Discard – Remove packet from the network silently Reject – Remove packet from the network and return an ICMP message of administratively prohibited to IP source

Copyright © 2001, Juniper Networks, Inc. Static Next-Hop Options (2 of 2) Receive – Sends traffic to the Routing Engine if the route matches a configured /32 interface address – Very useful in a VPN environment Label Switched Path – Must be an active named LSP with the local router as the ingress router Qualified Next-hop – Allows a route to have multiple versions in the routing table – Versions can have separate preference values, metrics, etc.

Copyright © 2001, Juniper Networks, Inc. Routes in Multiple Tables It can be useful for a single route destination to appear in more than one route table – Virtual Private Networks – Multicast Networks A rib-group is a convenient method for placing routes in multiple locations routing-options { rib-groups { group name { import-policy [policy-name]; import-rib [routing-table-name]; export-rib routing-table-name; }

Copyright © 2001, Juniper Networks, Inc. Rib-Groups Created within the routing-options hierarchy level Import-rib states where to place routes – Multiple tables can be listed – The first table listed must be the primary rib – Routes must exist in the primary rib before being placed into any secondary routing tables Export-rib states where to retrieve routes – Only a single routing table can be listed – Route table must be the primary rib

Copyright © 2001, Juniper Networks, Inc. Rib-Group Applications Routing protocols – IS-IS – OSPF – RIP – BGP Multicast protocols – PIM – MSDP Static routes Interface-routes – Protocols Direct and Local

Copyright © 2001, Juniper Networks, Inc. Rib-Group Configuration Created and named Applied to routing protocols Applied to static and interface routes routing-options { rib-groups { example-rib { import-rib [inet.0 inet.2]; protocols { isis { rib-group example-rib; } ospf { rib-group example-rib; } routing-options { interface-routes { rib-group inet example-rib; } static { rib-group example-rib; }

Copyright © 2001, Juniper Networks, Inc. Review Questions