Netgear XCM8806 Chassis User Manual - Page 703
Multiprotocol BGP, BGP Features
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NETGEAR 8800 User Manual entry two { if { nlri 192.168.34.0/24; } then { extended-community set "rt:10.45.92.168:300"; extended-community add "rt:10.203.100.200:40 soo:100:60000"; extended-community delete "rt:65001:10000 soo:72.192.34.10:70"; permit; } } A BGP route 192.168.34.128/25 is received with extended community attribute rt:4567:100 soo:192.168.34.128. When the above policy entry is applied to the route's extended community attribute, the following is true: • After applying the 1st set (community set "rt:10.45.92.168:300"), the route's community becomes rt:10.45.92.168:300. • After applying the 2nd set (community add "rt:10.203.100.200:40 soo:100:60000"), the community becomes rt:10.45.92.168:300 rt:10.203.100.200:40 soo:100:60000. • After applying the 3rd set (community delete "rt:65001:10000 soo:72.192.34.10:70"), the community becomes rt:10.45.92.168:300 rt:10.203.100.200:40 soo:100:60000. Note that this delete statement has no effect as none of the communities in the delete statement are present in the community attribute. Extended Communities and BGP Route Aggregation When BGP routes are aggregated with the as-match or as-set CLI option, all the component route's extended community attributes are aggregated and the resulting aggregated extended community attributes are attached to the aggregate network. Aggregation of several extended community attributes is simply the set union of all the extended communities from all of the aggregated routes. Multiprotocol BGP Multiprotocol BGP (MBGP) is an enhanced BGP that carries IP multicast routes. BGP carries two sets of routes: one set for unicast routing and one set for multicast routing. This allows BGP to have non-congruent topologies for IPv4 Unicast and IPv4 Multicast networks. The routes associated with multicast routing are used by the Protocol Independent Multicast (PIM) to build data distribution trees. BGP Features This section describes the following configurable BGP features supported by XCM8800: • Route Reflectors on page 704 • Route Confederations on page 706 • Route Aggregation on page 710 Chapter 26. BGP | 703
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