Hi all,
I want to enable a backup BGP session (or perhaps, keep the session up and
change the import/export filters) only when the main peer goes down
(default disappears)
Conceptually, I want to do something like this:
if net = 0.0.0.0/0 then {
if from = x.x.x.x then { # x.x.x.x = main peer
disable backup_bgp_session;
} else {
enable backup_bgp_session;
}
}
Obviously this doesn't work, since disable/enable cannot be used in the
config. The logic is also a little flawed.
I thought about setting a global variable in one filter, and using that
variable in another to decide what to export to the backup peer, but it
seems that BIRD only supports local variables?
I can fudge it by using an external script to query "birdc show route
0.0.0.0/0" to check for the presense of default, and then "birdc enable
backup_bgp_session" or "birdc disable backup_bgp_session" as appropriate,
but I'd prefer to be able to do it within BIRD.
Hope someone can give me some hints. Thanks.
