[dev] bgp connection between 2 Nodes with IPv6 on global IPs and want to route via global ipv6 address not via ipv6 link local address

[Xiaodong Xu]

Can you try the solution suggested in the comment of the github issue
https://github.com/FRRouting/frr/issues/10009?

Specifically, with the command

> set ipv6 next-hop prefer-global

in the route-map context.

Shelton

On Tue, Mar 15, 2022 at 6:19 AM SANDEEP KUMAR <sandeepkumar2016000 at gmail.com>
wrote:

> Hi All,
>
> BGP connection between 2 Nodes with IPv6 on global IPs and want to route
> via global ipv6 address not via ipv6 link local address
>
> I have made the bgp connection with global ipv6 address of interface and
> advertising the ipv6 route when advertising the route then bgp route added
> on Node2 for *2003:4001:5001::/64 via **fe80::6548:ed45:d5d:b578:link
> address of Node1  **but i want route with via * *5001:1::9 global ipv6
> address (**2003:4001:5001::/64 via **5001:1::9) *
> Similarly when we advertise 8001:1::/64 from Node2, *So want help so that
> I can achieve the bgp route added on Node1 and Node2 via global ipv6
> address not with ipv6 link address*
>
>     2003:4001:5001::/64
>  ------------[Node1]<===========================>[Node2]-------------
> 8001:1::/64
>                                                           ASN:65001
>
>  ASN:65002
>                                                           *5001:1::9:global
>                                                                         *
> *5001:1::10:global*
>                                                           *fe80::6548:ed45:d5d:b578:link
>                                                 *
> *fe80::2938:1046:591:8387:link*
>
> *[Node1 configuration and interface info]*
> [root at localhost centosecmp]#* ifconfig ens5|grep inet*
>         inet 10.5.10.9  netmask 255.255.255.0  broadcast 10.5.10.255
>         *inet6 5001:1::9  prefixlen 64  scopeid 0x0<global>*
>         *inet6 fe80::6548:ed45:d5d:b578  prefixlen 64  scopeid 0x20<link>*
>
> localhost.localdomain(config-router)# *do show running-config*
> Building configuration...
>
> Current configuration:
> !
> frr version 7.2
> frr defaults traditional
> hostname localhost.localdomain
> !
>
>
>
>
>
>
>
>
> *router bgp 65001 bgp router-id 1.1.1.1 no bgp default
> ipv4-unicast neighbor 5001:1::10 remote-as 65002 ! address-family ipv6
> unicast  network 2003:4001:5001::/64  neighbor 5001:1::10
> activate exit-address-family*
> !
> line vty
> !
> end
> localhost.localdomain(config-router)#* do show ip bgp ipv6 summary*
>
> IPv6 Unicast Summary:
> BGP router identifier 1.1.1.1, local AS number 65001 vrf-id 0
> BGP table version 2
> RIB entries 3, using 552 bytes of memory
> Peers 1, using 20 KiB of memory
>
> Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down
> State/PfxRcd
> *5001:1::10      4      65002       7       7        0    0    0 00:02:13
>            1*
>
> Total number of neighbors 1
> localhost.localdomain(config-router)# *do show ipv6 route bgp*
> Codes: K - kernel route, C - connected, S - static, R - RIPng,
>        O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
>        v - VNC, V - VNC-Direct, A - Babel, D - SHARP, F - PBR,
>        f - OpenFabric,
>        > - selected route, * - FIB route, q - queued route, r - rejected
> route
>
> *B>* 8001:1::/64 [20/0] via fe80::2938:1046:591:8387, ens5, 00:02:19*
>
>
> *[Node2 configuration and interface info]*
> [root at localhost centosecmp]# *ifconfig ens4|grep inet*
>         inet 10.5.10.10  netmask 255.255.255.0  broadcast 10.5.10.255
>         *inet6 fe80::2938:1046:591:8387  prefixlen 64  scopeid 0x20<link>*
>        * inet6 5001:1::10  prefixlen 64  scopeid 0x0<global>*
>
> localhost.localdomain(config-router)# *do show running-config*
> Building configuration...
>
> Current configuration:
> !
> frr version 7.2
> frr defaults traditional
> hostname localhost.localdomain
> !
>
>
>
>
>
>
>
>
> *router bgp 65002 bgp router-id 222.222.222.222 no bgp default
> ipv4-unicast neighbor 5001:1::9 remote-as 65001 ! address-family ipv6
> unicast  network 8001:1::/64  neighbor 5001:1::9
> activate exit-address-family*
> !
> line vty
> !
> end
> localhost.localdomain(config-router)# *do show ip bgp ipv6 summary*
>
> IPv6 Unicast Summary:
> BGP router identifier 222.222.222.222, local AS number 65002 vrf-id 0
> BGP table version 2
> RIB entries 3, using 552 bytes of memory
> Peers 1, using 20 KiB of memory
>
> Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down
> State/PfxRcd
> *5001:1::9       4      65001       9       9        0    0    0 00:04:48
>            1*
>
> Total number of neighbors 1
> localhost.localdomain(config-router)# *do show ipv6 route bgp*
> Codes: K - kernel route, C - connected, S - static, R - RIPng,
>        O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
>        v - VNC, V - VNC-Direct, A - Babel, D - SHARP, F - PBR,
>        f - OpenFabric,
>        > - selected route, * - FIB route, q - queued route, r - rejected
> route
>
> *B>* 2003:4001:5001::/64 [20/0] via fe80::6548:ed45:d5d:b578, ens4,
> 00:05:08*
>
> Thanks & Regards,
> Sandeep Kumar
>
>
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> dev mailing list
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>
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