Refer to the exhibit. R1 has a BGP neighborship with a directly connected router on interface Gi0/0. Which command set is applied between the iterations of show ip bgp 2.2.2.2?
A.
R1(config)#no ip route 192.168.50.2 255.255.255.255 Gi0/0
B.
R1(config)#ip route 2.2.2.2 255.255.255.255 192.168.50.2
C.
R1(config)#router bgp 65002 R1(config-router)#neighbor 192.168.50.2 shutdown
D.
R1(config)#router bgp 65001 R1(config-router)#neighbor 192.168.50.2 shutdown
BGP rib failure from ‘show ip bgp’ indicates that a route learned from a neighbor where a lower administrative distance (from a static, or other IGP) has already been installed into the routing table, thus the BGP route has failed to install into the IP routing table (RIB) because it has been trumped by the lower admin distance route.
static route has lower AD thus the bgp route is failing to install
Agreed, Cisco doc on it here as well:
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/213286-understand-bgp-rib-failure-and-the-bgp-s.html
When routes are learned from other routing protocols with less AD than those learned through BGP, BGP routes will enter the RIB failure state and will not appear in the routing table. If you issue "show ip bgp summary" those routes will be marked with an 'r' to indicate BGP RIB failure.
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/213286-understand-bgp-rib-failure-and-the-bgp-s.html
Step 3. If the Routing Table already has the same prefix/prefix-length entry with a lower Administrative Distance (AD) as seen in show ip bgp, BGP marks the route received with RIB-Failure.
cisco_R3(config)#do s ip rou sta
Gateway of last resort is 2.2.2.2 to network 0.0.0.0
2.0.0.0/32 is subnetted, 1 subnets
S 2.2.2.2 [11/0] via 192.168.255.22
cisco_R3(config)#
cisco_R3(config)#
cisco_R3(config)#ip route 2.2.2.2 255.255.255.255 192.168.255.22 250
cisco_R3(config)#
cisco_R3(config)#
cisco_R3(config)#do s ip rou sta
S* 0.0.0.0/0 [1/0] via 2.2.2.2
172.16.0.0/16 is variably subnetted, 5 subnets, 2 masks
S 172.16.1.0/24 is directly connected, Ethernet0/0.30
S 192.168.1.0/24 is directly connected, Ethernet0/0.20
cisco_R3(config)#do s ip rou bg
2.0.0.0/32 is subnetted, 1 subnets
B 2.2.2.2 [20/0] via 192.168.255.22, 00:00:09 <<<<<<<<<<<<<<<<
cisco_R3(config)#
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