[FROG] disc0 interface in FreeBSD 12.x

Stephen Worley sworley at cumulusnetworks.com
Thu Oct 1 15:31:39 UTC 2020


this was disallowed starting with https://github.com/FRRouting/frr/pull/4302


If you have a valid use case might be worth discussing with the author over
slack.

On Thu, Oct 1, 2020 at 9:33 AM mike tancsa <mike at sentex.net> wrote:

> Hi Donald, the 10.128.128.144 is the disc0 interface on my production
> router running frr6 and it works as expected. I setup another test box
> with frr6 and used the same disc0 ip config
>
>
> e.g. on frr6
>
>  # ifconfig disc0
> disc0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 65532
>         inet 10.128.128.1 netmask 0xfffffffc
>         groups: disc
>         nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
>
> frr6# sh ip route connected
> Codes: K - kernel route, C - connected, S - static, R - RIP,
>        O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
>        T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
>        F - PBR,
>        > - selected route, * - FIB route
>
> C>* 10.128.128.0/30 is directly connected, disc0, 00:00:19
>
> frr6# sh ip route 10.128.128.1
> Routing entry for 10.128.128.0/30
>   Known via "connected", distance 0, metric 1, best
>   Last update 00:00:42 ago
>   * directly connected, disc0
>
> frr6# conf t
> frr6(config)# ip route 10.0.0.0/8 10.128.128.1
> frr6(config)# ^Z
> frr6# sh ip route 10.0.0.0/8
> Routing entry for 10.0.0.0/8
>   Known via "static", distance 1, metric 0, best
>   Last update 00:00:06 ago
>   * 10.128.128.1, via disc0
>
> frr6#
>
>
> on frr7
>
> frr7# sh ip route connected
> Codes: K - kernel route, C - connected, S - static, R - RIP,
>        O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
>        T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
>        F - PBR, f - OpenFabric,
>        > - selected route, * - FIB route, q - queued route, r - rejected
> route
>
> C>* 10.128.128.0/30 [0/1] is directly connected, disc0, 00:24:49
>
> frr7# sh ip route 10.128.128.1
> Routing entry for 10.128.128.0/30
>   Known via "connected", distance 0, metric 1, best
>   Last update 00:25:07 ago
>   * directly connected, disc0
>
> frr7# conf t
> frr7(config)# ip route 10.0.0.0/8 10.128.128.1
> % Warning!! Local connected address is configured as Gateway
> IP(10.128.128.1)
>
> frr7# sh ip route 10.0.0.0/8
> % Network not in table
> frr7#
>
>     ---Mike
>
>
>
> On 10/1/2020 8:00 AM, Donald Sharp wrote:
> > Can we see the output of `show ip route 10.128.128.144` and `show ip
> > route connected`?
> >
> > donald
> >
> > On Wed, Sep 30, 2020 at 3:03 PM mike tancsa <mike at sentex.net> wrote:
> >> Up to version 6.x of frr, I have been able to tie down larger prefixes
> >> with a static routing pointing to the discard interface on FreeBSD.
> >>
> >> eg. the static route entry
> >>
> >> ip route 10.0.0.0/8 10.128.128.144
> >>
> >> # sh ip route 10.0.0.0/8
> >> Routing entry for 10.0.0.0/8
> >>   Known via "static", distance 1, metric 0, best
> >>   Last update 09w0d01h ago
> >>   * 10.128.128.144, via disc0
> >>
> >> where disc0 is
> >>
> >> # ifconfig disc0
> >> disc0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 65532
> >>         inet 10.128.128.144 netmask 0xfffffffc
> >>         inet6 fe80::1%disc0 prefixlen 64 scopeid 0x8
> >>         inet6 2001:db8::1 prefixlen 64
> >>         groups: disc
> >>         nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> >>
> >>
> >> however, on frr7.4 this no longer works,
> >>
> >> On my test box
> >>
> >> % ifconfig disc0
> >> disc0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 65532
> >>         inet 10.128.128.1 netmask 0xfffffffc
> >>         inet6 fe80::1%disc0 prefixlen 64 scopeid 0x6
> >>         groups: disc
> >>         nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> >>
> >>
> >>
> >> i3# conf t
> >> i3(config)# ip route 10.0.0.0/8 10.128.128.1
> >> % Warning!! Local connected address is configured as Gateway
> >> IP(10.128.128.1)
> >> i3(config)#
> >>
> >> i3# sh ip route 10.0.0.0/8
> >> % Network not in table
> >> i3#
> >>
> >> If I user disc0, it seems to work, but I get warnings on start up
> >>
> >> i3(config)# ip route 10.0.0.0/8 disc0
> >>
> >> i3# wr
> >> Note: this version of vtysh never writes vtysh.conf
> >> Building Configuration...
> >> Configuration saved to /usr/local/etc/frr/zebra.conf
> >> Configuration saved to /usr/local/etc/frr/bgpd.conf
> >> Configuration saved to /usr/local/etc/frr/staticd.conf
> >> i3# sh ip route 10.0.0.0/8
> >> Routing entry for 10.0.0.0/8
> >>   Known via "static", distance 1, metric 0, best
> >>   Last update 00:00:07 ago
> >>   * directly connected, disc0, weight 1
> >>
> >> i3#
> >>
> >> 2020/09/30 14:57:53 STATIC: Static Route using disc0 interface not
> >> installed because the interface does not exist in specified vrf
> >> 2020/09/30 14:57:53 STATIC: Static Route using disc0 interface not
> >> installed because the interface does not exist in specified vrf
> >>
> >> the kernel routing table does seem to have it installed
> >>
> >>
> >> # netstat -nra | grep 10.0.0
> >> 10.0.0.0/8         disc0              U1            0  65532      disc0
> >> #
> >>
> >> What is the "proper" way to do this on frr7x ?
> >>
> >> Thanks
> >>
> >>     ---Mike
> >>
> >>
> >>
> >>
> >> _______________________________________________
> >> frog mailing list
> >> frog at lists.frrouting.org
> >> https://lists.frrouting.org/listinfo/frog
>
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>
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