Cisco Certified Support Technician (CCST) NetworkingIP ConnectivityMedium
A network administrator is configuring BGP on a router and needs to define the local autonomous system number. Which BGP command initializes the BGP routing process on a Cisco router and specifies this AS number?
- Anetwork 192.168.1.0 mask 255.255.255.0
- Brouter ospf 10
- Cneighbor 10.0.0.2 remote-as 65001
- Drouter bgp 65000
Show answer & explanationAnswer & explanation
Correct answer: D. router bgp 65000
The `router bgp <AS_number>` command is used in Cisco IOS to enable the BGP routing process and specify the local router's Autonomous System (AS) number. This is the foundational command for BGP configuration.
Why the other options are wrong
- A. This command is used within a routing protocol configuration (like OSPF or EIGRP) to advertise networks, not to start the BGP process or define the AS number.
- B. This command initiates an OSPF routing process, not BGP.
- C. This command is used within the BGP configuration to define a BGP neighbor and its remote AS, but it doesn't initialize the local BGP process itself.
BGP Router Command
The `router bgp <AS_number>` command initiates the BGP routing process on a Cisco router and specifies the autonomous system (AS) number for the local router.
- Essential first step for BGP configuration.
- AS number identifies the local BGP domain.
- Enters BGP router configuration mode.
Memory trick: Router BGP Starts the Journey, Neighbors Nurture.