For traffic engineering reasons, we need to balance traffic over equal links/sessions, for example to steer traffic towards a particular IX.
For IPv4, this works by setting a appropriate weight to routes received through a particular connection
# set protocols bgp XXX neighbor XXX address-family ipv4-unicast weight 1020
For IPv6, the address-family ipv6-unicast-weight parameter is not available:
# set protocols bgp 65534 neighbor fd00:111::11 address-family ipv6-unicast weight 23232 Configuration path: protocols bgp 65534 neighbor fd00:111::11address-family ipv6-unicast [weight] is not valid
As discussed with Viacheslav in Slack already, its possible to expose the address-family ipv6-unicast-weight parameter to the configuration by updatinng the vyatta-cfg-quagga package (test version here) .
I tested the package provided in our lab and can confirm that the new setting is in place and does what i want to achieve. Please go on and release it for PR for crux and rolling.