Netgear XCM8806 Chassis User Manual - Page 717
Route Redistribution, BGP ECMP
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NETGEAR 8800 User Manual Route Redistribution BGP, OSPF, and RIP can be enabled simultaneously on the switch. Route redistribution allows the switch to exchange routes, including static and direct routes, between any two routing protocols. Exporting routes from OSPF to BGP and from BGP to OSPF are discrete configuration functions. To run OSPF and BGP simultaneously, you must first configure both protocols and then verify the independent operation of each. Then you can configure the routes to export from OSPF to BGP and the routes to export from BGP to OSPF. Configuring Route Redistribution Exporting routes between any two routing protocols are discrete configuration functions. For example, you must configure the switch to export routes from OSPF to BGP; and, if desired, you must configure the switch to export routes from BGP to OSPF. You must first configure both protocols and then verify the independent operation of each. Then you can configure the routes to export from OSPF to BGP and the routes to export from BGP to OSPF. You can use route maps to associate BGP attributes including Community, NextHop, MED, Origin, and Local Preference with the routes. Route maps can also be used to filter out exported routes. To enable or disable the exporting of OSPF, RIP, ISIS, static, and direct (interface) routes to BGP, use the following commands: enable bgp export [blackhole | direct | ospf | ospf-extern1 | ospf-extern2 | ospf-inter | ospf-intra | rip | static {address-family [{ipv4-unicast |ipv4-multicast]} {export-policy } disable bgp export [blackhole | direct | ospf | ospf-extern1 | ospf-extern2 | ospf-inter | ospf-intra | rip | static {address-family [{ipv4-unicast |ipv4-multicast]} Using the export command to redistribute routes complements the redistribution of routes using the configure bgp add network command. The configure bgp add network command adds the route to BGP only if the route is present in the routing table. The enable bgp export command redistributes the specified routes from the routing table to BGP. If you use both commands to redistribute routes, the routes redistributed using the network command take precedence over routes redistributed using the export command. BGP ECMP The BGP Equal Cost Multi-path (ECMP) feature supports load sharing by creating a multipath to a destination. This multipath contains multiple routes that are determined to have an equal cost because the following parameters are the same for each route: • Weight • Local preference (for IBGP multipaths) • AS path (entire attribute, not just the length) Chapter 26. BGP | 717
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