Advertise IPv4 prefix for IPv6 enabled BGP peers

IPv6 enabled BGP peers that are configured with address-family ipv4-unicast should have a route-map to define the next hop for the ipv4 prefix. This example defines a route-map for IPv6 enabled BGP peers. The route-map enables the device with a physical IPv6 address to advertise an IPv4 prefix with proper ipv4 address as the next hop.

In this example Router 2 is connected to Router 4 and has IPv4 and IPv6 interfaces. The physical direct connection link is configured with IPv4 30.1.1/24 and IPv6 30:1:1::/64 addresses. Router 2 and Router 4 are configured as BGP peers by using ipv6 30:1:1::/64 address.

The network should look as shown in the figure.

Table 1. Advertise IPv4 prefix for IPv6 enabled BGP peers
Router	Step	Commands
R2	Display IPv4 prefix advertised by the BGP peer.	`vyatta@R2# run show ip bgp ipv4 unicast BGP table version is 5, local router ID is 170.2.2.2 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, l - labeled S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 20.1.1.0/24 30.1.1.2 32768 ? Total number of prefixes 1`
R2	Display the configuration.	`vyatta@R2# show protocol bgp bgp 100 { address-family { ipv4-unicast { redistribute { connected { route-map map1 } } } } neighbor 30:1:1::1 { address-family { ipv4-unicast ipv6-unicast } remote-as 200 } }`
R2	Display the policy configuration.	`vyatta@R2# show policy policy { route { prefix-list p1 { rule 10 { action permit prefix 20.1.1.0/24 } } route-map map1 { rule 10 { action permit match { ip { address { prefix-list p1 } } } set { ip-next-hop 30.1.1.2 } } } } }`
R2	Create a rule to match prefix 20.1.1.0/24.	`vyatta@R2# set policy route prefix-list p1 rule 10 action permit vyatta@R2# set policy route prefix-list p1 rule 10 prefix 20.1.1.0/24`
R2	Create a route-map rule to allow all IP address in the prefix list p1.	`vyatta@R2# set policy route route-map map1 rule 10 action 'permit' vyatta@R2# set policy route route-map map1 rule 10 match ip address prefix-list 'p1'`
R2	Create a route-map rule to configure the ip-next hop as '30.1.1.2'.	`vyatta@R2# set policy route route-map map1 rule 10 set ip-next-hop '30.1.1.2'`
R2	Redistribute ipv4 unicast directly connected route into BGP.	`vyatta@R2# set protocols bgp 100 address-family ipv4-unicast redistribute connected route-map map1`
R2	Configure IPv4 and IPv6 unicast address family between BGP peers.	`vyatta@R2# set protocols bgp 100 neighbor 30:1:1::1 address-family ipv4-unicast vyatta@R2# set protocols bgp 100 neighbor 30:1:1::1 address-family ipv6-unicast vyatta@R2# set protocols bgp 100 neighbor 30:1:1::1 remote-as 200`
R2	Display interfaces to verify the configuration.	`vyatta@R2# show interfaces Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down Interface IP Address S/L Description --------- ---------- --- ----------- dp0p160p1 10.18.177.130/21 u/u dp0p161p1 20.1.1.2/24 u/u 20:1:1::2/64 dp0p162p1 - u/u dp0p192p1 - u/u dp0p193p1 - u/u dp0p193p1.10 110.1.1.1/24 A/D dp0p194p1 30.1.1.2/24 u/u 30:1:1::2/64 dp0p224p1 - u/u dp0p225p1 - u/u dp0p256p1 - u/u dp0p257p1 - u/u lo1 170.2.2.2/24 u/u lo99 - u/u`
R2	Display advertised BGP IPv4 unicast routes for a BGP neighbor.	`vyatta@R2# run show ip bgp ipv4 unicast neigh 30:1:1::1 advertised-routes BGP table version is 25, local router ID is 170.2.2.2 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 20.1.1.0/24 30.1.1.2 32768 ? Total number of prefixes 1`
R4	Display IPv4 unicast routes for R4.	vyatta@R4# show ip bgp ipv4 unicast BGP table version is 7, local router ID is 170.4.4.4 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, l - labeled S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path > 20.1.1.0/24 30.1.1.2 0 0 100 ? Total number of prefixes 1 vyatta@R4# sh ip bgp ipv4 unicast neighbors 30:1:1::2 received-routes BGP table version is 7, local router ID is 170.4.4.4 Status codes: s suppressed, d damped, h history, valid, > best, i - internal Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 20.1.1.0/24 30.1.1.2 0 100 ? Total number of prefixes 1
R4	Display interfaces for R4.	`vyatta@R4# show interfaces Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down Interface IP Address S/L Description --------- ---------- --- ----------- dp0p160p1 10.18.177.132/21 u/u dp0p161p1 30.1.1.1/24 u/u 30:1:1::1/64 dp0p192p1 - u/u dp0p193p1 - u/u dp0p224p1 - u/u dp0p225p1 - u/u dp0p256p1 - A/D dp0p257p1 - A/D lo1 170.4.4.4/32 u/u lo2 - u/u`
R4	Display the configuration on R4.	`vyatta@R4# show protocol bgp bgp 200 { neighbor 30:1:1::2 { address-family { ipv4-unicast { soft-reconfiguration { inbound } } ipv6-unicast } remote-as 100 } }`
R4	Configure the IPv6 neighbor.	`vyatta@R4# set protocols bgp 200 neighbor 30:1:1::2 address-family ipv4-unicast soft-reconfiguration inbound`
R4	Display the configuration.	`vyatta@R4# show ip bgp summary BGP router identifier 170.4.4.4, local AS number 200 BGP table version is 7 2 BGP AS-PATH entries 0 BGP community entries IPv4 Unicast address family: Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down Statd 30:1:1::2 4 100 52 52 7 0 0 00:25:00 1 Total number of neighbors 1 IPv6 Unicast address family: Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down Statd 30:1:1::2 4 100 52 52 1 0 0 00:25:00 0 Total number of neighbors 1`

Vyatta documentation

Learn how to install, configure, and operate the Vyatta Network Operating System (Vyatta NOS) and Orchestrator, which help drive our virtual networking and physical platforms portfolio.

Advertise IPv4 prefix for IPv6 enabled BGP peers

Helpful Links

Key Resources