300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

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QuestionQ147

Layer 3 Technologies

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Refer to the exhibit. The IT router connects to the Sales and Marketing departments. Its interfaces are assigned to their respective VRFs to isolate the routes for the two departments. Which configuration set must the IT router use for BGP to distribute routes for each department while maintaining its own routing table for network isolation?

  • A router bgp 111address-family ipv4 unicastneighbor 172.16.1.2 remote-as 111neighbor 172.16.2.2 remote-as 111neighbor 172.16.11.2 remote-as 111neighbor 172.16.12.2 remote-as 111
  • B router bgp 111address-family ipv4 vrf Marketingneighbor 172.16.1.2 remote-as 111neighbor 172.16.2.2 remote-as 111!address-family ipv4 vrf Salesneighbor 172.16.11.2 remote-as 111neighbor 172.16.12.2 remote-as 111
  • C router bgp 111neighbor 172.16.1.2 remote-as 111neighbor 172.16.2.2 remote-as 111neighbor 172.16.11.2 remote-as 111neighbor 172.16.12.2 remote-as 111
  • D router bgp 111address-family ipv4 vrf Marketingneighbor 172.16.1.2 remote-as 111neighbor 172.16.1.2 Route-reflector-clientneighbor 172.16.2.2 remote-as 111neighbor 172.16.2.2 Route-reflector-client!address-family ipv4 vrf Salesneighbor 172.16.11.2 remote-as 111neighbor 172.16.11.2 Route-reflector-clientneighbor 172.16.12.2 remote-as 111neighbor 172.16.12.2 Route-reflector-client
Explanation

BGP peers that belong to separate VRFs must be configured under the corresponding address-family ipv4 vrf <vrf-name> contexts. This associates the Marketing peers with the Marketing routing table and the Sales peers with the Sales routing table, preserving route isolation. Route-reflector-client is not required for direct iBGP peerings. Cisco documents address-family ipv4 vrf vrf-name as associating subsequent IPv4 BGP address-family configuration with that VRF, including its BGP neighbors.

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