[quagga-users 14571] Re: Trouble distributing 0.0.0.0/1 route through RIP

I wanted to update the list on this issue.

RIPD refuses to accept a default route with a non-zero netmask.  When quagga
RIPD receives 0.0.0.0/1, it changes the mask to /0. And since ROUTER-2 had a
static route to 0.0.0.0/0, it dropped the route in favor of the already
installed static.

The key to debugging this was to enable 'debugging rip packet recv', at
which point RIPD logged the following message:

	Default route with non-zero netmask.  Set zero to netmask

I asked about this on quagga-dev and the community consensus seems to be
this is what RFC 2453 intended:
https://lists.quagga.net/pipermail/quagga-dev/2016-December/016561.html


To achieve our goal of preferring one upstream over another, we have changed
our configuration to be the following:

On ROUTER-1 we have:
 
    router rip
        version 2
        network eth3
        redistribute static
    ! Default to preferred upstream
    ip route 0.0.0.0/0 192.168.1.1

On ROUTER-2 we have:

    router rip
        version 2
        network eth3
        redistribute static
    ! Default to backup upstream (increased distance to be one
    ! greater than rip's distance of 120)
    ip route 0.0.0.0/0 192.168.2.1 121


This works as we expected.

Jim C.



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