A network administrator working for a private service provider with an employee ID: 4872:46:269 wants to configure timers for the BGP process on their Cisco IOS XE router. Which configuration follows guideline timer recommendations and is a valid BGP timer deployment?
Answer(s): C
The default BGP timers are: Keepalive: 60 seconds Holdtime: 180 seconds (3x Keepalive)For more aggressive convergence, a ratio of 1:3 (Keepalive : Holdtime) is recommended, which ensures efficient BGP session monitoring.In this case: Keepalive = 40 seconds Holdtime = 60 secondsThe timers in chosen option follow the 1:3 ratio rule for BGP timer deployment. timers keep-alive 40 and timers hold 60 are valid and well within Cisco IOS XE standards. These values ensure reliable session management while improving convergence performance.
Refer to the exhibit. The service provider environment has these configurations:-The OSPF backbone area is configured to advertise loopback prefixes.-The PE routers run the BGP-IPv4 address family in a BGP-free core topology.-The broadband users IP subnet 192.168.10.0/24 is redistributed in BGP on PEA.The operations team noticed route disruptions when broadband subscriber 192.168.10.8 goes offline. Which configuration must an engineer apply to PEA to resolve this problem?
Answer(s): B
The broadband IP subnet 192.168.10.0/24 is redistributed into BGP. When 192.168.10.8 (a specific host) goes offline, this likely causes the route for 192.168.10.0/24 to flap or be withdrawn from BGP because the redistributed route depends on the presence of live hosts. This can cause disruptions for other hosts within the same subnet.To stabilize the route advertisement in BGP, a static route to Null0 is configured for the entire subnet 192.168.10.0/24. The static route ensures that the prefix remains in the routing table regardless of host reachability. Redistributing the static route into BGP ensures that the prefix remains consistently advertised.The ip route 192.168.10.0 255.255.255.0 Null0 creates a "dummy" static route that keeps the prefix in the routing table. The redistribute static command in BGP ensures the static route is advertised.
SIMULATIONGuidelinesThis 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 doses and cannot be reopened.Topology: Tasks:Star Technology has decided to establish connectivity with an ISP for accessing the Internet. In phase 1, the approach is to establish a dual-homed connection from HQ-R1 to ISP-R1 and ISP-R2. This will provide some degree of redundancy in the connectivity between HQ-R1 and ISP routers.Based on network design, an autonomous system of Star Technology is 1, and AS of ISP is 2. A network Implementation Engineer has already initiated the configuration; trouble-shooting is required to find out and complete missing configurations. Moreover, configuration is to be established in a way that links between HQ-R1 and ISP-R1 can be used as the preferred path for reaching AS 2.Below are tasks to be achieved to include the missing commands and complete the troubleshootingTask 1:On HQ-R1, configure BGP for Autonomous System 1. Establish EBGP relationship with ISP-R1 and ISP-R2.Notes:After performing troubleshooting at HQ-R1, the following outcome should appear.%BGP-5-ADJCHANGE: neighbor 192.168.12.2 Up%BGP-5-ADJCHANGE: neighbor 192.168.13.2 UpTask 2:On HQ-R1, Advertise LBO interface as a prefix in BGRTask 3:On HQ-R1, configure the route map with the name loc. Set the local preference attribute as 900.Task 4:On HQ-R1, define the path between HQ-R1 - ISP-R1 as the preferred path for reaching AS 2. Route map configured in task 3 to be used in the inbound direction.
Answer(s): A
Task 1: Configure BGP for AS 1 and Establish EBGP Peering with ISP-R1 and ISP-R2To establish an EBGP relationship between HQ-R1 and ISP-R1/ISP-R2 on HQ-R1:router bgp 1 neighbor 192.168.12.2 remote-as 2 neighbor 192.168.13.2 remote-as 2router bgp 1: Enables BGP for AS 1 on HQ-R1.neighbor <IP> remote-as 2: Establishes an EBGP session with the neighbors ISP-R1 (192.168.12.2) and ISP-R2 (192.168.13.2).Task 2: Advertise Loopback0 Interface Prefix in BGPTo advertise the loopback interface (e.g., Loopback0) into BGP on HQ-R1:router bgp 1 network <L0 IP> mask <L0 Subnet>Example (assuming Loopback0 IP is 192.168.10.1/24):router bgp 1 network 192.168.10.0 mask 255.255.255.0The network command specifies which prefix (L0) to advertise into BGP.Task 3: Configure a Route Map Named loc to Set Local Preference to 900To set the local preference attribute to 900 using a route map on HQ-R1:route-map loc permit 10 set local-preference 900route-map loc permit 10: Creates a route map named loc.set local-preference 900: Sets the local preference to 900, which influences route selection.Task 4: Prefer the Path via ISP-R1 for Reaching AS 2To prefer the link between HQ-R1 and ISP-R1 as the preferred path on HQ-R1:router bgp 1 neighbor 192.168.12.2 route-map loc inneighbor 192.168.12.2 route-map loc in: Applies the loc route map inbound on the session with ISP-R1 (192.168.12.2).This sets the local preference to 900 for routes received from ISP-R1, making it the preferred path.Verification Commands-Verify BGP Neighbors: show ip bgp summaryExpected output: Neighbors 192.168.12.2 and 192.168.13.2 should be Up.-Verify Advertised Routes: show ip bgpConfirm the Loopback0 prefix is advertised.-Verify Local Preference: show ip bgp neighbors 192.168.12.2 received-routesCheck that the local preference is 900 for routes from ISP-R1.Complete Configuration Summary on HQ-R1:router bgp 1 neighbor 192.168.12.2 remote-as 2 neighbor 192.168.13.2 remote-as 2 network 192.168.10.0 mask 255.255.255.0 neighbor 192.168.12.2 route-map loc inroute-map loc permit 10 set local-preference 900The local preference value of 900 ensures that routes from ISP-R1 are preferred over ISP-R2.The Loopback0 prefix is successfully advertised into BGP.The BGP sessions to ISP-R1 and ISP-R2 are established as required.
Refer to the exhibit. What is the relationship between Router 1 and Router 2?
Answer(s): D
What is used by SR-TE to steer traffic through the network?
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/segment-routing/configuration/guide/b-seg-routing-cg-asr9k/b-seg-routing-cg-asr9k_chapter_0100.html
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