Brocade BigIron RX Series Configuration Guide - Manual (Page 939)

BigIron RX Series Configuration Guide 861
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Modifying redistribution parameters
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The next-hop IP address for 102.0.0.1 is not an IGP route, which means the BGP route’s destination
still cannot be reached through IP. The recursive next-hop lookup feature performs a lookup on
10.0.0.1’s next-hop gateway:
This lookup results in an IGP route. In fact, this route is a directly-connected route. As a result, the
BGP route’s destination is now reachable through IGP, which means the BGP route is eligible for
installation in the IP route table. Here is the BGP route in the IP route table.
This BigIron RX can use this route because the device has an IP route to the next-hop gateway.
Without recursive next-hop lookups, this route would not be in the IP route table.
Enabling recursive next-hop lookups
The recursive next-hop lookups feature is disabled by default.
To enable recursive next-hop lookups, enter the following command at the BGP configuration level
of the CLI.
BigIron RX(config-bgp)# next-hop-recursion
Syntax: [no] next-hop-recursion
Modifying redistribution parameters
By default, the router does not redistribute route information between BGP4 and the IP IGPs (RIP,
ISIS, and OSPF). You can configure the router to redistribute OSPF, ISIS, or RIP routes, directly
connected routes, or static routes into BGP4.
To enable redistribution of all OSPF routes and directly attached routes into BGP4, enter the
following commands.
BigIron RX(config)# router bgp
BigIron RX(config-bgp)# redistribute ospf
BigIron RX(config-bgp)# redistribute connected
BigIron RX(config-bgp)# write memory
Syntax: [no] redistribute connected | ospf | rip | isis | static
The connected parameter indicates that you are redistributing routes to directly attached devices
into BGP.
The ospf parameter indicates that you are redistributing OSPF routes into BGP4.
BigIron RX# show ip route 10.0.0.1
Total number of IP routes: 38
Network Address Gateway Port Cost Type
10.0.0.0 0.0.0.0 1/1 1 D
AS_PATH: 65001 4355 1
BigIron RX# show ip route 240.0.0.0/24
Total number of IP routes: 38
Network Address Gateway Port Cost Type
240.0.0.0 10.0.0.1 1/1 1 B
AS_PATH: 65001 4355 1