Cisco 3560G 48TS Software Configuration Guide - Page 675
Using Route Maps to Redistribute Routing Information
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Chapter 30 Configuring IP Unicast Routing Configuring Protocol-Independent Features Beginning in privileged EXEC mode, follow these steps to define a static route to a network as the static default route: Step 1 Step 2 Step 3 Step 4 Command configure terminal ip default-network network number end show ip route Step 5 copy running-config startup-config Purpose Enter global configuration mode. Specify a default network. Return to privileged EXEC mode. Display the selected default route in the gateway of last resort display. (Optional) Save your entries in the configuration file. Use the no ip default-network network number global configuration command to remove the route. When default information is passed through a dynamic routing protocol, no further configuration is required. The system periodically scans its routing table to choose the optimal default network as its default route. In IGRP networks, there might be several candidate networks for the system default. Cisco routers use administrative distance and metric information to determine the default route or the gateway of last resort. If dynamic default information is not being passed to the system, candidates for the default route are specified with the ip default-network global configuration command. If this network appears in the routing table from any source, it is flagged as a possible choice for the default route. If the router has no interface on the default network, but does have a path to it, the network is considered as a possible candidate, and the gateway to the best default path becomes the gateway of last resort. Using Route Maps to Redistribute Routing Information The switch can run multiple routing protocols simultaneously, and it can redistribute information from one routing protocol to another. For example, you can instruct the switch to readvertise IGRP-derived routes by using RIP or to readvertise static routes by using IGRP. Redistributing information from one routing protocol to another applies to all supported IP-based routing protocols. You can also conditionally control the redistribution of routes between routing domains by defining enhanced packet filters or route maps between the two domains. The match and set route-map configuration commands define the condition portion of a route map. The match command specifies that a criterion must be matched; the set command specifies an action to be taken if the routing update meets the conditions defined by the match command. Although redistribution is a protocol-independent feature, some of the match and set route-map configuration commands are specific to a particular protocol. One or more match commands and one or more set commands follow a route-map command. If there are no match commands, everything matches. If there are no set commands, nothing is done, other than the match. Therefore, you need at least one match or set command. You can also identify route-map statements as permit or deny. If the statement is marked as a deny, the packets meeting the match criteria are sent back through the normal forwarding channels (destination-based routing). If the statement is marked as permit, set clauses are applied to packets meeting the match criteria. Packets that do not meet the match criteria are forwarded through the normal routing channel. 78-16156-01 Catalyst 3560 Switch Software Configuration Guide 30-67
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