Routing protocols handle routing activity on systems and routers. Routers and other systems exchange routing information about known routes to remote networks. These protocols assist the system in determining where to forward packets. Some routing protocols, although not all, also maintain statistics that you can use to measure routing performance.
The following table describes the supported routing protocols in Oracle Solaris.
For more information about routing tables and types in Oracle Solaris, see Routing Tables and Routing Types.
Routing Information Protocol (RIP) is a distance-vector routing protocol. RIP uses a hop counter as its routing metric. It is implemented by the routing daemon in.routed. The daemon automatically starts when the system is booted. When run on a router with the –s option specified, the in.routed daemon fills the kernel routing table with a route to every reachable network and advertises reachability through all network interfaces. When run on a system with the –q option specified, the in.routed daemon extracts routing information but does not advertise reachability.
On systems, routing information can be extracted in the following two ways:
By not specifying the flag (capital S or space-saving mode). The in.routed daemon builds a full routing table exactly as it does on a router.
By specifying the flag. The in.routed daemon creates a minimal kernel table containing a single default route for each available router.
Systems use the Router Discovery (RDISC) protocol to obtain routing information from routers. When systems run RDISC, routers must also run another protocol, such as RIP, to exchange router information.
RDISC is implemented by the daemon in.routed, which must run on both routers and systems. On systems, in.routed uses RDISC to discover default routes from routers that advertise the address through RDISC. On routers, in.routed uses RDISC to advertise default routes to systems on directly-connected networks. See the in.routed(8) man page and the gateways(5) man page for more information.
Quagga is a routing software suite that enables the implementation of RIP, RIPng, Open Shortest Path First (OSPF), Intermediate System to Intermediate System (IS-IS), and Border Gateway Protocol (BGP) protocols for UNIX platforms including Oracle Solaris.
RIPng offers an extension of RIP for support of IPv6, including various enhancements for IPv6. The functions of RIPng are similar to those of RIP.
OSPF is a router protocol which is used to distribute routing information within a larger autonomous system network. The latest version of OSPF, OSPFv3, adds support for IPv6.
IS-IS is a link state dynamic routing protocol which is used to distribute routing information within a large service provider network.
BGP uses a prefixed set of IP networks to make routing decisions based on the path and rules among large autonomous system networks.
The following table lists the Open Source Quagga routing protocols that are supported in Oracle Solaris.
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For more information about the Quagga protocols, go to the Quagga Routing Suite web site at http://www.nongnu.org/quagga/index.html.