Netgear XCM8810 Chassis User Manual - Page 702
Extended Community Syntax, Extended Community Match Rule in Policy
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NETGEAR 8800 User Manual • rt:100.200.300.400:200: Invalid because the IP address is invalid • soo:12345678:500: Invalid because the AS number 12345678 is out of range [1-65535] Extended Community Syntax Note the following details with regard to extended community syntax: • Only rt and soo extended community types are recognized in the policy file. • The IP address MUST be a valid host address. Network address, Class-D and experimental IP address are not accepted. • There should not be any blank spaces inside an extended community. For example, rt :100:200 is not a valid extended community because there are spaces between rt and : • All three parameters of an extended community must be present, otherwise the extended community is rejected. Extended Community Match Rule in Policy Regular expressions are not supported for extended communities. In addition, an extended community match statement matches with a route's extended community if at least one of the extended communities in the match statement matches with the route's extended community. There is no need to for all the extended communities in a single match statement to match with the route's extended community. For example, suppose the policy file is the following: entry one { if { extended-community "rt:100:20000 rt:10.203.134.5:40 soo:100:50000 soo:192.168.34.1:600"; } then { permit; } } The above community statement will match with all BGP routes that have at least one of the following extended communities in their extended community attribute: • rt:100:20000 • rt:10.203.134.5:40 • soo:100:50000 • soo:192.168.34.1:600 Extended Community Set Rule in Policy A Policy set block can contain several extended community statements. Each set statement is applied to the matching route's extended community attribute in the top down order. That is, the first set is applied to the extended community attribute of the route, the second set is applied to the result of above, and so forth. For example, assume that a policy is the following: 702 | Chapter 26. BGP
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