Layer 3 Routing Commands 1316(R1)(config)# route-map SEND_OUT permit 10(R1)(config-route-map)# match extcommunity 13(R1)(config-route-map)# set extcommunity rt 10:10 additive(R1)(config-route-map)# exitset extcommunity sooUse the set extcommunity soo command to set BGP extended communityattributes for the site of origin. Use the no form of the command to removethe extended community attributes for the site of origin.NOTE: This command is effective only if BGP is running on the router.Syntaxset extcommunity soo value [additive]no set extcommunity soo• value — Specifies the site of origin extended community value. This valuecan be entered in one of the following formats:– 16-bit AS number :your 32-bit value (Ex : 100 :11)– 32-bit IPv4 address :your 16-bit value (Ex : 10.1.1.1 :22• additive–Adds a route target to the existing route target list withoutreplacing any existing route targets.Default ConfigurationNo site of origin extended community attributes are set.Command ModeRoute Map Configuration modeUser GuidelinesThe site of origin (SOO) extended communities attribute is configured withthe soo keyword. This attribute uniquely identifies the site from which theProvider Edge (PE) router learned the route. All routes learned from aparticular site must be assigned the same SOO extended communityattribute, whether a site is connected to a single PE router or multiple PErouters. Configuring this attribute prevents routing loops from occurringwhen a site is multi-homed. The SOO extended community attribute is
