Exam 350-501 topic 1 question 338 discussion

Actual exam question from Cisco's 350-501

Question #: 338
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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R1 and R2 are having issues forming an eBGP neighbor relationship. Troubleshoot and resolve the issue to achieve these goals:

1. Configure R1 and R2 to form a BGP neighborship using their Loopback interfaces.
2. Form the neighbor relationship using a BGP multihop mechanism. Use minimal values to solve the issue.

Show Suggested Answer

Suggested Answer:

by DUsoo at Feb. 8, 2023, 12:51 p.m.

Comments

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DUsoo

Highly Voted 2 years, 3 months ago

i think when you paste "ebgp-multihop 2" you do not have to configure disable-connected-check

upvoted 7 times

1234512345

2 years, 1 month ago

Yes, you are right. We have 2 options to configure this lab with ebgp-multihop or disable-connected-check. I did this lab gns and in both case bgp neighbor is up... According to the second point in question, they said to use ebgp multihop with minimal ttl. We should to use ebgp-multihop 2.

upvoted 2 times

picho707

1 year, 3 months ago

Thanks for the clue. I tested both suggestions and they both worked in my lab.

upvoted 1 times

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picho707

Most Recent 1 year, 3 months ago

R1 router bgp 100 bgp router-id 10.1.1.1 bgp log-neighbor-changes neighbor 10.2.2.2 remote-as 200 neighbor 10.2.2.2 ebgp-multihop 2 neighbor 10.2.2.2 update-source Loopback0 ! address-family ipv4 network 10.1.1.1 mask 255.255.255.255 network 172.16.0.0 mask 255.255.255.0 neighbor 10.2.2.2 activate exit-address-family ip route 10.2.2.2 255.255.255.255 172.16.0.2 R2 router bgp 200 bgp router-id 10.2.2.2 bgp log-neighbor-changes neighbor 10.1.1.1 remote-as 100 neighbor 10.1.1.1 ebgp-multihop 2 neighbor 10.1.1.1 update-source Loopback0 ! address-family ipv4 network 10.2.2.2 mask 255.255.255.255 network 172.16.0.0 mask 255.255.255.0 neighbor 10.1.1.1 activate exit-address-family ip route 10.1.1.1 255.255.255.255 172.16.0.1

upvoted 2 times

picho707

1 year, 3 months ago

Version 2 R1 router bgp 100 bgp router-id 10.1.1.1 bgp log-neighbor-changes neighbor 10.2.2.2 remote-as 200 neighbor 10.2.2.2 disable-connected-check neighbor 10.2.2.2 update-source Loopback0 ! address-family ipv4 network 10.1.1.1 mask 255.255.255.255 network 172.16.0.0 mask 255.255.255.0 neighbor 10.2.2.2 activate exit-address-family ip route 10.2.2.2 255.255.255.255 172.16.0.2 R2 router bgp 200 bgp router-id 10.2.2.2 bgp log-neighbor-changes neighbor 10.1.1.1 remote-as 100 neighbor 10.1.1.1 disable-connected-check neighbor 10.1.1.1 update-source Loopback0 ! address-family ipv4 network 10.2.2.2 mask 255.255.255.255 network 172.16.0.0 mask 255.255.255.0 neighbor 10.1.1.1 activate exit-address-family ! ip forward-protocol nd no ip http server ip http secure-server ! ip route 10.1.1.1 255.255.255.255 172.16.0.1

upvoted 1 times

sharon90

6 months, 1 week ago

why adding network 10.1.1.1 mask 255.255.255.255 network 172.16.0.0 mask 255.255.255.0 ? i believe neighbor 10.1.1.1 activate is fully enough

upvoted 1 times

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10urkcmz

1 year, 10 months ago

Can see https://networklessons.com/bgp/ebgp-multihop to find out more on how multihop works

upvoted 1 times

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