Exam 300-410 topic 1 question 452 discussion

Actual exam question from Cisco's 300-410

Question #: 452
Topic #: 1

Refer to the exhibit. The IT router is connected with the Sales and Marketing departments. The interfaces have been assigned to their respective VRFs to keep the two department routes isolated. Which configuration set must the IT router use for BGP to distribute routes for each department that maintains their own routing table for network isolation?

A. router bgp 111
address-family ipv4 unicast
neighbor 172.16.1.2 remote-as 111
neighbor 172.16.2.2 remote-as 111
neighbor 172.16.11.2 remote-as 111
neighbor 172.16.12.2 remote-as 111
B. router bgp 111
address-family ipv4 vrf Marketing
neighbor 172.16.1.2 remote-as 111
neighbor 172.16.2.2 remote-as 111
!
address-family ipv4 vrf Sales
neighbor 172.16.11.2 remote-as 111
neighbor 172.16.12.2 remote-as 111
C. router bgp 111
neighbor 172.16.1.2 remote-as 111
neighbor 172.16.2.2 remote-as 111
neighbor 172.16.11.2 remote-as 111
neighbor 172.16.12.2 remote-as 111
D. router bgp 111
address-family ipv4 vrf Marketing
neighbor 172.16.1.2 remote-as 111
neighbor 172.16.1.2 Route-reflector-client
neighbor 172.16.2.2 remote-as 111
neighbor 172.16.2.2 Route-reflector-client
!
address-family ipv4 vrf Sales
neighbor 172.16.11.2 remote-as 111
neighbor 172.16.11.2 Route-reflector-client
neighbor 172.16.12.2 remote-as 111
neighbor 172.16.12.2 Route-reflector-client

Show Suggested Answer

Suggested Answer: D 🗳️

by potato_inet0 at May 24, 2023, 9:01 a.m.

Comments

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potato_inet0

Highly Voted 2 years, 1 month ago

D is the correct answer, we have iBGP setup, Routes received by the IT router will be iBP routes so they'll never be sent to iBGP, we need route-reflection per each VRF.

upvoted 11 times

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HungarianDish_111

Highly Voted 2 years, 1 month ago

Selected Answer: D

I agree with potato_inet0. Also confirmed solution "D" in the lab. Connection is established between iBGP peers, but the routes advertised by the edge routers are only available if the central IT router is setting the peers as route-reflector-client. For instance, if Marketing-1 is advertising a LAN with ip 1.1.1.1/24, Marketing-2 can only reach that if they both are RRclients and IT is RR.

upvoted 9 times

bk989

10 months, 2 weeks ago

Answer is D. Note we only need ONE route-reflector client as BGP reflects client routes to non-client routes. Next hop self would be nice in this as wekk, if IT didn't advertise the peering links.

upvoted 1 times

bk989

10 months, 2 weeks ago

IT: show run router bgp 111 bgp router-id 100.100.100.100 bgp log-neighbor-changes ! address-family ipv4 vrf TEST network 172.16.11.0 mask 255.255.255.0 network 172.16.12.0 mask 255.255.255.0 neighbor 172.16.11.2 remote-as 111 neighbor 172.16.11.2 activate neighbor 172.16.12.2 remote-as 111 neighbor 172.16.12.2 activate neighbor 172.16.12.2 route-reflector-client exit-address-family

upvoted 1 times

bk989

10 months, 2 weeks ago

SALES2 pings SALES1 loopback source loopback0 SALES2#ping 1.1.1.1 source L0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds: Packet sent with a source address of 2.2.2.2 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 5/5/7 ms We can get away with one route-reflector client

upvoted 1 times

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