Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH ユーザーズマニュアル

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.

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 <policy-name>}

 

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)