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

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QuestionQ505

Layer 3 Technologies

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Refer to the exhibit. A network engineer configured R1 and R2 using MP-BGP. The engineer noticed that the routers cannot exchange IPv6 routes; however, the IPv4 neighbor relationship is working properly.

Which configuration must the engineer apply to R2 to exchange IPv6 routes?

  • A ipv6 unicast-routingipv6 cef!interface Loopback100ipv6 address 2001:DB8:128::2/128!interface GigabitEthernet1/0ipv6 address 2001:DB8:1::2/64!router bgp 65002no bgp default ipv4-unicastneighbor 2001:DB8:1::1 remote-as 65001!address-family ipv4network 2001:DB8:128::2/128
  • B ipv6 unicast-routingipv6 cef!interface Loopback100ipv6 address 2001:DB8:128::2/128!interface GigabitEthernet1/0ipv6 address 2001:DB8:1::2/64!router bgp 65002no bgp default ipv4-unicastneighbor 2001:DB8:1::1 remote-as 65001!address-family ipv6network 2001:DB8:128::2/128
  • C ipv6 unicast-routingipv6 cef!interface Loopback100ipv6 address 2001:DB8:128::2/128!interface GigabitEthernet1/0ipv6 address 2001:DB8:1::2/64description AS65001 ID B468^AD03G907::1!router bgp 65002no bgp default ipv4-unicastneighbor 2001:DB8:1::1 remote-as 65001!address-family ipv6network 2001:DB8:128::2/128neighbor 2001:DB8:1::1 activate
  • D ipv6 cef!interface Loopback100ipv6 address 2001:DB8:128::2/128!interface GigabitEthernet1/0ipv6 address 2001:DB8:1::2/64!router bgp 65002no bgp default ipv4-unicastneighbor 2001:DB8:1::1 remote-as 65001!address-family ipv6network 2001:DB8:128::2/128neighbor 2001:DB8:1::1 activate
Explanation

MP-BGP handles each address family independently. To exchange IPv6 prefixes, the BGP neighbor must be activated under the IPv6 address family with neighbor 2001:DB8:1::1 activate. IPv6 unicast routing must also be enabled. Cisco documentation specifies that exchanging IPv6 prefixes requires neighbor activate in address-family configuration mode.

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