Brocade TurboIron 24X Series Configuration Guide - Manual (Page 724)

690 Brocade TurboIron 24X Series Configuration Guide
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Optional configuration tasks
The first lookup results in an IBGP route, to network 10.102.0.0/24.
Since the route to 10.102.0.1/24 is not an IGP route, the Layer 3 Switch cannot reach the next hop
through IP, and thus cannot use the BGP route. In this case, since recursive next-hop lookups are
enabled, the Layer 3 Switch next performs a lookup for 10.102.0.1 next-hop gateway, 10.0.0.1.
The next-hop IP address for 10.102.0.1 is not an IGP route, which means the BGP route destination
still cannot be reached through IP. The recursive next-hop lookup feature performs a lookup on
10.0.0.1 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 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.
TurboIron#show ip bgp route
Total number of BGP Routes: 5
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 Metric LocPrf Weight Status
1 0.0.0.0/0 10.1.0.2 0 100 0 BI
AS_PATH: 65001 4355 701 80
2 10.102.0.0/24 10.0.0.1 1 100 0 BI
AS_PATH: 65001 4355 1
3 10.104.0.0/24 10.1.0.2 0 100 0 BI
AS_PATH: 65001 4355 701 1 189
4 10.240.0.0/24 10.102.0.1 1 100 0 BI
AS_PATH: 65001 4355 3356 7170 1455
5 10.250.0.0/24 10.157.24.1 1 100 0 I
AS_PATH: 65001 4355 701
TurboIron#show ip route 10.102.0.1
Total number of IP routes: 38
Network Address NetMask Gateway Port Cost Type
10.102.0.0 255.255.255.0 10.0.0.1 1 1 B
AS_PATH: 65001 4355 1
TurboIron#show ip bgp route 10.102.0.0
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 Metric LocPrf Weight Status
1 10.102.0.0/24 10.0.0.1 1 100 0 BI
AS_PATH: 65001 4355 1
TurboIron#show ip route 10.0.0.1
Total number of IP routes: 38
Network Address NetMask Gateway Port Cost Type
10.0.0.0 255.255.255.0 0.0.0.0 1 1 D
AS_PATH: 65001 4355 1
TurboIron#show ip route 10.240.0.0/24
Total number of IP routes: 38
Network Address NetMask Gateway Port Cost Type
10.240.0.0 255.255.255.0 10.0.0.1 1 1 B
AS_PATH: 65001 4355 1