Dell PowerConnect B-RX - Page 833

BigIron RX Series Configuration Guide 757
53-1002253-01
BGP Null0 routing
26
Router 2
The following configuration defines a null0 route to the specific next hop address. The next hop
address 199.199.1.1 points to 128.178.1.101, which gets blocked.
BigIron RX(config)#ip route 199.199.1.1/32 null0
BigIron RX(config)#router bgp
BigIron RX(config-bgp-router)#local-as 100
BigIron RX(config-bgp-router)#neighbor <router1_int_ip address> remote-as 100
BigIron RX(config-bgp-router)#neighbor <router3_int_ip address> remote-as 100
BigIron RX(config-bgp-router)#neighbor <router4_int_ip address> remote-as 100
BigIron RX(config-bgp-router)#neighbor <router5_int_ip address> remote-as 100
BigIron RX(config-bgp-router)#neighbor <router6_int_ip address> remote-as 100
BigIron RX(config-bgp-router)#neighbor <router7_int_ip address> remote-as 100
After configuring the null0 application, you can display the configuration using the show ip route
static, show ip bgp route, and show ip route commands.
For example, when you issue the show ip route static command on Router 6, you see the following
output.
Entering a show ip route static on Router 1 and Router 2 displays the following.
Entering a show BGP route on Router 6 displays its routing table.
BigIron RX# show ip route static
Type Codes - B:BGP D:Connected S:Static R:RIP O:OSPF; Cost - Dist/Metric
Destination Gateway Port Cost Type
1 110.0.0.40/29 DIRECT eth 3/7 1/1 S
2 115.0.0.192/27 DIRECT eth 3/7 1/1 S
3 120.0.14.0/23 DIRECT eth 3/7 1/1 S
BigIron RX#
BigIron RX# show ip route static
Type Codes - B:BGP D:Connected S:Static R:RIP O:OSPF; Cost - Dist/Metric
Destination Gateway Port Cost Type
1 192.168.0.1/32 DIRECT drop 1/1 S
BigIron RX#