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135 lines
4.9 KiB
ReStructuredText
135 lines
4.9 KiB
ReStructuredText
.. _static-routing:
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######
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Static
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######
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Static routes are manually configured routes, which, in general, cannot be
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updated dynamically from information VyOS learns about the network topology from
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other routing protocols. However, if a link fails, the router will remove
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routes, including static routes, from the :abbr:`RIPB (Routing Information
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Base)` that used this interface to reach the next hop. In general, static
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routes should only be used for very simple network topologies, or to override
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the behavior of a dynamic routing protocol for a small number of routes. The
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collection of all routes the router has learned from its configuration or from
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its dynamic routing protocols is stored in the RIB. Unicast routes are directly
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used to determine the forwarding table used for unicast packet forwarding.
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Static Routes
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#############
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.. cfgcmd:: set protocols static route <subnet> next-hop <address>
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Configure next-hop `<address>` for an IPv4 static route. Multiple static
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routes can be created.
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.. cfgcmd:: set protocols static route <subnet> next-hop <address> disable
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Disable this IPv4 static route entry.
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.. cfgcmd:: set protocols static route <subnet> next-hop <address> distance <distance>
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Defines next-hop distance for this route, routes with smaller administrative
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distance are elected prior those with a higher distance.
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Range is 1 to 255, default is 1.
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.. note:: Routes with a distance of 255 are effectively disabled and not
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installed into the kernel.
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.. cfgcmd:: set protocols static route6 <subnet> next-hop <address>
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Configure next-hop `<address>` for an IPv6 static route. Multiple static
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routes can be created.
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.. cfgcmd:: set protocols static route6 <subnet> next-hop <address> disable
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Disable this IPv6 static route entry.
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.. cfgcmd:: set protocols static route6 <subnet> next-hop <address> distance <distance>
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Defines next-hop distance for this route, routes with smaller administrative
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distance are elected prior those with a higher distance.
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Range is 1 to 255, default is 1.
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.. note:: Routes with a distance of 255 are effectively disabled and not
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installed into the kernel.
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Interface Routes
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================
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.. cfgcmd:: set protocols static interface-route <subnet> next-hop-interface <interface>
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Allows you to configure the next-hop interface for an interface-based IPv4
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static route. `<interface>` will be the next-hop interface where trafic is
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routed for the given `<subnet>`.
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.. cfgcmd:: set protocols static interface-route <subnet> next-hop-interface <interface> disable
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Disables interface-based IPv4 static route.
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.. cfgcmd:: set protocols static interface-route <subnet> next-hop-interface <interface> distance <distance>
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Defines next-hop distance for this route, routes with smaller administrative
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distance are elected prior those with a higher distance.
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Range is 1 to 255, default is 1.
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.. cfgcmd:: set protocols static interface-route6 <subnet> next-hop-interface <interface>
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Allows you to configure the next-hop interface for an interface-based IPv6
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static route. `<interface>` will be the next-hop interface where trafic is
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routed for the given `<subnet>`.
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.. cfgcmd:: set protocols static interface-route6 <subnet> next-hop-interface <interface> disable
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Disables interface-based IPv6 static route.
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.. cfgcmd:: set protocols static interface-route6 <subnet> next-hop-interface <interface> distance <distance>
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Defines next-hop distance for this route, routes with smaller administrative
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distance are elected prior those with a higher distance.
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Range is 1 to 255, default is 1.
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Blackhole
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=========
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.. cfgcmd:: set protocols static route <subnet> blackhole
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Use this command to configure a "black-hole" route on the router. A
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black-hole route is a route for which the system silently discard packets
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that are matched. This prevents networks leaking out public interfaces, but
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it does not prevent them from being used as a more specific route inside your
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network.
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.. cfgcmd:: set protocols static route <subnet> blackhole distance <distance>
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Defines blackhole distance for this route, routes with smaller administrative
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distance are elected prior those with a higher distance.
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.. cfgcmd:: set protocols static route6 <subnet> blackhole
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Use this command to configure a "black-hole" route on the router. A
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black-hole route is a route for which the system silently discard packets
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that are matched. This prevents networks leaking out public interfaces, but
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it does not prevent them from being used as a more specific route inside your
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network.
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.. cfgcmd:: set protocols static route6 <subnet> blackhole distance <distance>
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Defines blackhole distance for this route, routes with smaller administrative
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distance are elected prior those with a higher distance.
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Alternate Routing Tables
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========================
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TBD
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Alternate routing tables are used with policy based routing of by utilizing
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:ref:`vrf`.
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