Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 95)

Multi-Service IronWare Routing Configuration Guide 67
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Modifying redistribution parameters
The first lookup results in an IBGP route, to network 10.0.0.0/24.
Since the route to 10.0.0.1/24 is not an IGP route, the device cannot reach the next hop through IP,
and so cannot use the BGP4 route. In this case, since recursive next-hop lookups are enabled, the
device next performs a lookup for the next-hop gateway to 10.0.0.1’s next-hop gateway, 10.0.0.1.
The next-hop IP address for 10.0.0.1 is not an IGP route, which means the BGP4 route destination
still cannot be reached through IP. The recursive next-hop lookup feature performs a lookup on the
next-hop gateway for 10.0.0.1
This lookup results in an IGP route that is a directly-connected route. As a result, the BGP4 route
destination is now reachable through IGP, which means the BGP4 route can be added to the IP
route table. The IP route table with the BGP4 route is shown here.
The device can use this route because it has an IP route to the next-hop gateway. Without recursive
next-hop lookups, this route would not be in the IP route table.
Modifying redistribution parameters
By default, the device does not redistribute route information between BGP4 and the IP IGPs (RIP,
IS-IS, and OSPF). You can configure the device to redistribute OSPF, IS-IS, 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.
Brocade# show ip route 10.0.0.1
Total number of IP routes: 38
Network Address Gateway Port Cost Type
10.0.0.0 10.0.0.1 1/1 1 B
AS_PATH: 65001 4355 1
Brocade# show ip bgp route 10.0.0.0
Number of BGP Routes matching display condition : 1
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
H:HISTORY I:IBGP L:LOCAL M:MULTIPATH S:SUPPRESSED
Prefix Next Hop MED LocPrf Weight Status
1 10.0.0.0/24 10.0.0.1 1 100 0 BI
AS_PATH: 65001 4355 1
Brocade# 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
Brocade# show ip route 10.0.0.0/24
Total number of IP routes: 38
Network Address Gateway Port Cost Type
10.0.0.0 10.0.0.1 1/1 1 B
AS_PATH: 65001 4355 1