Set onlink routes for all subnets on an external network

[OpenStack Infra]

https://review.openstack.org/90250
commit fc7cffedbe60ae9da7963373e9072c55700fce5f
Author: Carl Baldwin <email address hidden>
Date: Thu Apr 24 23:06:10 2014 +0000

    Set onlink routes for all subnets on an external network

    The addition of the on-link routes gives us some freedom to allocate a
    router's IP address from any one of multiple subnets on one external
    network. Different routers can get their IPs from different subnets and
    they still have direct on-link connectivity to each other. For example,
    one router with its primary IP from 10.0.0.0/24 and another from
    192.168.0.0/24 can communicate directly. It is important that each
    router has on-link routes to *all* of the subnets.

    Any router can host floating ips from any of the subnets regardless of
    which subnet the primary IP address comes from.

    This is an alternative to the "Multiple floating IP pools" section in
    the administration guide. It is a simpler alternative that avoids
    having to create multiple external networks. It is also more flexible
    because routers will no longer be restricted to getting floating IPs
    from the pool to which they happen to be connected.

    DocImpact
    Document the procedure for adding subnets to the external network.
    Potentially remove the existing procedure for "Multiple floating IP
    pools" from the docs.

    Change-Id: I2c283f5be0cbb6b5d350cafc1b636c300b796a7b
    Closes-Bug: #1312467

[Andreas Jaeger (jaegerandi)]

I don't see where this is documented

[Tom Fifield (fifieldt)]

Matt, this one is super confusing. Did you happen to cover it in the network guide so far?

[Tom Fifield (fifieldt)]

More info in the original bug at neutron here: https://bugs.launchpad.net/neutron/+bug/1312467

[Lana (loquacity)]

This hasn't been completed, but the Networking Guide is probably the best place for it.

[Lana (loquacity)]

Chen Xing, are you working on this?

[Chason Chan (chen-xing)]

sorry, I am busy these days.

[Lana (loquacity)]

Procedure for "Multiple floating IP pools" has been removed since this bug was created (at least, I can't find a procedure in any current docs). Additionally, the Networking Guide has content about adding subnets here: http://docs.openstack.org/mitaka/networking-guide/adv-config-subnet-pools.html There is also information in the User Guide here: http://docs.openstack.org/user-guide/dashboard_create_networks.html

With this in mind, I'm closing this bug as fix released for now. If the original reporters (or other networking gurus) believe that something still needs to be added, please be specific and reopen, and I'll get that work done for you.