inet-rtr:      [mandatory]  [single]     [primary/look-up key]
descr:         [mandatory]  [multiple]   [ ]
alias:         [optional]   [multiple]   [ ]
local-as:      [mandatory]  [single]     [inverse key]
ifaddr:        [mandatory]  [multiple]   [lookup key]
peer:          [optional]   [multiple]   [ ]
member-of:     [optional]   [multiple]   [inverse key]
remarks:       [optional]   [multiple]   [ ]
admin-c:       [mandatory]  [multiple]   [inverse key]
tech-c:        [mandatory]  [multiple]   [inverse key]
notify:        [optional]   [multiple]   [inverse key]
mnt-by:        [mandatory]  [multiple]   [inverse key]
changed:       [mandatory]  [multiple]   [ ]
source:        [mandatory]  [single]     [ ]