Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 433)

The following configuration defines a null0 route to the specific next hop address. The next hop address
10.199.1.1 points to the null0 route, which gets blocked.
device(config)# ip route 10.199.1.1/32 null0
device(config)# router bgp
device(config-bgp-router)# local-as 100
device(config-bgp-router)# neighbor router1_int_ip address remote-as 100
device(config-bgp-router)# neighbor router3_int_ip address remote-as 100
device(config-bgp-router)# neighbor router4_int_ip address remote-as 100
device(config-bgp-router)# neighbor router5_int_ip address remote-as 100
device(config-bgp-router)# neighbor router6_int_ip address remote-as 100
device(config-bgp-router)# neighbor router7_int_ip address remote-as 100
Show commands for BGP4 null 0 routing
After configuring the null0 application, you can display the output using show commands.
Device 6
Show ip route static output for device 6.
device# show ip route static
Type Codes - B:BGP D:Connected S:Static R:RIP O:OSPF; Cost - Dist/Metric
Destination Gateway Port Cost Type
1 10.0.0.40/29 DIRECT eth 3/7 1/1 S
2 10.0.0.192/27 DIRECT eth 3/7 1/1 S
3 10.0.14.0/23 DIRECT eth 3/7 1/1 S
device#
Device 1 and 2
Show ip route static output for device 1 and device 2.
device# show ip route static
Type Codes - B:BGP D:Connected S:Static R:RIP O:OSPF; Cost - Dist/Metric
Destination Gateway Port Cost Type
1 10.199.1.1/32 DIRECT drop 1/1 S
device#
Device 6
The following is the show ip bgp route output for Device-6
device#show ip bgp route
Total number of BGP Routes: 126
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH m:NOT-INSTALLED-MULTIPATH
S:SUPPRESSED F:FILTERED s:STALE
Prefix Next Hop MED LocPrf Weight Status
1 10.0.1.0/24 10.0.1.3 0 100 0 BI
AS_PATH:
. .. . . . .
9 10.0.0.16/30 10.0.1.3 100 0 I
AS_PATH: 85
10 10.0.0.40/29 10.199.1.1/32 1 1000000 32768 BL
AS_PATH:
11 10.0.0.80/28 10.0.1.3 100 0 I
. .. . . . .
. .. . . . .
36 10.0.0.96/28 10.0.1.3 100 0 I
AS_PATH: 50
37 10.0.0.192/27 10.199.1.1/32 1 10000000 32768 BL
AS_PATH:
. .. . . . .
64 10.0.7.0/24 10.0.1.3 100 0 I
AS_PATH: 10
65 10.0.14.0/23 10.199.1.1/32 1 1000000 32768 BL
AS_PATH: .. . . . .
Device 1 and 2
Show commands for BGP4 null 0 routing
FastIron Ethernet Switch Layer 3 Routing Configuration Guide 433
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