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Exam 350-401 topic 1 question 896 discussion

Actual exam question from Cisco's 350-401

Question #: 896
Topic #: 1

SIMULATION
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Guidelines
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This is a lab item in which tasks will be performed on virtual devices.

• Refer to the Tasks tab to view the tasks for this lab item.
• Refer to the Topology tab to access the device console(s) and perform the tasks.
• Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window.
• All necessary preconfigurations have been applied.
• Do not change the enable password or hostname for any device.
• Save your configurations to NVRAM before moving to the next item.
• Click Next at the bottom of the screen to submit this lab and move to the next question.
• When Next is clicked, the lab closes and cannot be reopened.

Topology
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Tasks
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Configure R2 according to the topology to achieve these results:
1. Configure eBGP using Loopback 0 for the router-id. Do not use the address-family command to accomplish this.
2. Advertise R2’s Loopback 100 and Loopback 200 networks to AS40 and AS60.

R2
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R1
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R3
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Show Suggested Answer

Suggested Answer:

by Mizuchan at Jan. 28, 2024, 3:45 a.m.

Comments

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Mizuchan

Highly Voted 1 year, 6 months ago

How I think it should be:[ To check current configuration: Sh run Sh ip int brief On R2: router bgp 50 bgp router-id 10.2.2.2 neighbor 209.165.200.225 remote-as 40 neighbor 209.165.200.229 remote-as 60 router bgp 50 network 209.165.201 11 mask 255.255.255.255 network 209.165.201 12 mask 255.255.255.255 To verify: Show ip bgp sum On R2: Copy running-config startup-config Not sure why in the resolution they used those neighbor IP addresses...

upvoted 11 times

Mizuchan

1 year, 6 months ago

Sh run Sh ip int brief On R2: router bgp 50 bgp router-id 10.2.2.2 neighbor 209.165.200.225 remote-as 40 neighbor 209.165.200.229 remote-as 60 router bgp 50 network 209.165.201.11 mask 255.255.255.255 network 209.165.201.12 mask 255.255.255.255 To verify: Show ip bgp sum Also can sh ip route on R1 and R3 to check if the loopbacks were learned. On R2: Copy running-config startup-config

upvoted 4 times

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cloud29

Highly Voted 1 year, 4 months ago

As for me it should be like that on R2. interface Loopback0 ip address 2.2.2.2 255.255.255.255 ! interface Loopback100 ip address 10.100.100.1 255.255.255.0 ! interface Loopback200 ip address 10.200.200.1 255.255.255.0 ! router bgp 50 bgp router-id 2.2.2.2 bgp log-neighbor-changes network 10.100.100.0 mask 255.255.255.0 network 10.200.200.0 mask 255.255.255.0 neighbor 209.165.200.225 remote-as 40 neighbor 209.165.200.229 remote-as 60

upvoted 6 times

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junya_kimura

Most Recent 5 months, 1 week ago

I got this question today. But insted of not using the address-family command, use the address-family command and advertise all loopback 0, 100 and 200. Does anyone know the answer?

upvoted 1 times

WENG_POGI

4 months, 3 weeks ago

we have same question.answer should be like this. router bgp 50 bgp router-id int lo0 neighbor 209.165.200.225 remote-as 40 neighbor 209.165.200.229 remote-as 60 address-family ipv4 unicast neighbor 209.165.200.225 activate neighbor 209.165.200.229 activate network (loopback 0 ip add) mask 255.255.255.255 network (your loopback 100 ip add) mask 255.255.255.255 network (your loopback 200 ip add) mask 255.255.255.255

upvoted 1 times

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f9e40af

9 months ago

I got this question, but instead wanted you to setup the neighbors using the address-family command.

upvoted 3 times

WENG_POGI

4 months, 3 weeks ago

R1 router bgp 40 neighbor 209.265.200.226 remote-as 50 neighbor 209.165.202.129 remote-as 60 address-family ipv4 unicast neighbor 209.165.200.226 activate neighbor 209.165.202.129 activate

upvoted 1 times

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Calinserban

9 months ago

hi, could you show how the commands should look like?

upvoted 1 times

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Swiz005

1 year ago

I took and passed the exam today. this lap came out

upvoted 4 times

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hellrider69

1 year, 1 month ago

but the question stated that router id should be set without the address family cmd so i think bgp router id command is wrong.... anyway bgp router id will be the highest loopback on the router

upvoted 1 times

NetworkJanitor

9 months, 1 week ago

Cisco employee - Peter Paluch "if you enter the "no bgp default ipv4-unicast" command in the BGP configuration, you will prevent BGP from automatically assigning each newly defined neighbor into "address-family ipv4" section." I tested this, but no matter what, some portion of the config will show up under address-family (CML code 17.2)

upvoted 1 times

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awsguruking

1 year, 4 months ago

R3#show ip bgp BGP table version is 24, local router ID is 10.30.30.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path * 209.165.201.11/32 209.165.202.130 0 40 50 i *> 209.165.200.230 0 0 50 i * 209.165.201.12/32 209.165.202.130 0 40 50 i *> 209.165.200.230 0 0 50 i

upvoted 1 times

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Claudiu1

1 year, 5 months ago

another suggestion from me: wouldn't it make more sense to use "bgp router-id interface Loopback0" since the first requirement is "Configure eBGP using Loopback 0 for the router-id"?

upvoted 3 times

TacoGrande

8 months ago

R1(config-router)#bgp router-id ? A.B.C.D Manually configured router identifier vrf vrf-specific router id configuration R1(config-router)#bgp router-id

upvoted 1 times

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kivi_bg

1 year, 6 months ago

just a suggestion - why don't we just use redistribute connected?

upvoted 1 times

Steve122

1 year ago

only Lo100 and Lo200 need to be redistributed (exclude Lo0)

upvoted 1 times

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