C H A P T E R 17 |
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RRD allows the exchange of routing information between different routing protocols running on the same router. It enables a routing protocol to advertise routes that are learned by other means, such as another routing protocol, static configuration, or direct connection. While running a single routing protocol throughout an entire IP internetwork may be desirable, multi-protocol routing is widespread for a number of reasons. For example, company mergers, multiple departments managed by different network administrators, and multi-vendor environments create situations where a single routing protocol cannot be used. Running different routing protocols is also often part of a network design. In any case, having a multi protocol environment makes redistribution a necessity.
When multiple routing protocols are used, routers in the same autonomous system (AS) run the same protocol to compute routes within the autonomous system. A router that connects two or more autonomous systems is known as a border router. A border router advertises routing information from one AS to other AS(s). Different routing protocols use different and sometimes incompatible algorithms and metrics. It is only possible to redistribute routing information for compatible metrics.
The list of CLI commands for the configuration of RRD is as follows:
Sets the AS number for the router.
The RRD Module must be enabled before any routing protocol module is configured. |
Sets the router identifier’s address for the router.
The router-id must be one of the IP addresses of the IP interfaces configured in the switch. |
Enables redistribution of OSPF area or external routes to the protocol. The no form of the command disables redistribution of OSPF area or external routes to the protocol.
Adds the permit or deny redistribution policy. The no form of the command removes the permit or deny redistribution policy.
redistribute-policy {permit|deny} dest-ip dest-range {connected | static | rip | ospf} {rip | ospf | all} |
Sets the default behavior of RRD control table.
Displays information about the active routing protocol process.
Displays route redistribution filters.
SEFOS# show redistribute-policy Destination Range SrcProto DestProto Flag ----------- ----- -------- ----------- --- |
Displays RTM RRD status for registered protocols.
SEFOS# show redistribute information ProtoName OspfAreaRoutes OspfExtRoutes |
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