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Tag: 642-661

642-661 BGP Configuring BGP on Cisco Routers (BGP)

On the Certkiller 3 router:

SIMULATION
Network topology exhibit

Domain.com recently issued a contract to ISP (AS 65020) to provide a second Internet connection their Boston location. A new router, Certkiller 3, will need to be configured to connect to the Internet Service Providers. It is necessary to configure this router to exchange routes with both ISPs, and to filter the routing advertisements out to the ISPs. The basic configuration for the new router has been entered. It is only necessary to complete the BGP configuration steps outlined below.
On the Certkiller 3 router:
Configure BGP to exchange routes with ISP-A (AS 65010). Configure BGP to exchange routes with ISP-B (AS 65020). Only announce the two local Ethernet LAN prefixes (172.16.1.0/24 and 172.16.2.0/24) to the ISPs.
Configure the appropriate as-path access-list to permit only locally originated routes to be advertised in outbound routing updates to the ISPs. Use as-patch ACL number 10 containing only one statement. Start the simulation by clicking on the local host icon.

ExhibitComplete the following BGP configuration on CK5 so that it will remove the 65001 private AS number befo

Exhibit

Complete the following BGP configuration on CK5 so that it will remove the 65001 private AS number before it sends the 13.5.0.0/16 update to AS 200.
Hostname CK5
!
!Output omitted
!
router bgp 300
neighbor 3.3.3.3 remote-as 300
neighbor 4.4.4.4 remote-as 300
neighbor 6.6.6.6 remote-as 300
———————————————

what is the most likely problem that causes the two IBGP routes NOT to be selected as the best route in the BG

Exhibit:
R1#show ip bgp
BGP table version is 1, local router ID is 10.0.0.1 Status codes: s suppressed, d damped, h history, *valid,>best,iinternal Origin codes: i – IGP, e – EGP,? – incomplete
Network Next Hop Metric LocPrf Wight Path
*i133.3.0.0 3.3.3.3 0 100 0 65101 i
*i172.0.0.0/8 20.1.1.5 0 100 0 65102 i
R1#show ip route
Codes: C – connected, S – static, I – IGRP, R -RIP, M -mobile, B
– BGP
D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2
E1 – OSPF external type 1, E2 – OSPF external type 2, E – EGP i – IS-IS, L1 – IS-IS level-1, L2 – IS-IS level-2, * – candidate default
U – per-user static route, o – ODR, P – periodic downloaded staticroute
T – traffic engineered route
Gateway of last resort is not set
C 30.0.0.0/8 is directly connected, FastEthernet0/0 C 10.0.0.0/8 is directly connected, Loopback111
C 40.0.0.0/8 is directly connected, Serial0/0
Based on the exhibits show ip bg and show ip route output, what is the most likely problem that causes the two IBGP routes NOT to be selected as the best route in the BGP table?


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