[FROG] disc0 interface in FreeBSD 12.x

[mike tancsa]

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
>>
>>
>>
>>
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