<div dir="ltr">this was disallowed starting with <a href="https://github.com/FRRouting/frr/pull/4302">https://github.com/FRRouting/frr/pull/4302</a> <br><br>If you have a valid use case might be worth discussing with the author over slack.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Oct 1, 2020 at 9:33 AM mike tancsa <<a href="mailto:mike@sentex.net">mike@sentex.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Donald, the 10.128.128.144 is the disc0 interface on my production<br>
router running frr6 and it works as expected. I setup another test box<br>
with frr6 and used the same disc0 ip config<br>
<br>
<br>
e.g. on frr6<br>
<br>
# ifconfig disc0<br>
disc0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 65532<br>
inet 10.128.128.1 netmask 0xfffffffc<br>
groups: disc<br>
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL><br>
<br>
frr6# sh ip route connected<br>
Codes: K - kernel route, C - connected, S - static, R - RIP,<br>
O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,<br>
T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,<br>
F - PBR,<br>
> - selected route, * - FIB route<br>
<br>
C>* <a href="http://10.128.128.0/30" rel="noreferrer" target="_blank">10.128.128.0/30</a> is directly connected, disc0, 00:00:19<br>
<br>
frr6# sh ip route 10.128.128.1<br>
Routing entry for <a href="http://10.128.128.0/30" rel="noreferrer" target="_blank">10.128.128.0/30</a><br>
Known via "connected", distance 0, metric 1, best<br>
Last update 00:00:42 ago<br>
* directly connected, disc0<br>
<br>
frr6# conf t<br>
frr6(config)# ip route <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a> 10.128.128.1<br>
frr6(config)# ^Z<br>
frr6# sh ip route <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a><br>
Routing entry for <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a><br>
Known via "static", distance 1, metric 0, best<br>
Last update 00:00:06 ago<br>
* 10.128.128.1, via disc0<br>
<br>
frr6#<br>
<br>
<br>
on frr7<br>
<br>
frr7# sh ip route connected<br>
Codes: K - kernel route, C - connected, S - static, R - RIP,<br>
O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,<br>
T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,<br>
F - PBR, f - OpenFabric,<br>
> - selected route, * - FIB route, q - queued route, r - rejected<br>
route<br>
<br>
C>* <a href="http://10.128.128.0/30" rel="noreferrer" target="_blank">10.128.128.0/30</a> [0/1] is directly connected, disc0, 00:24:49<br>
<br>
frr7# sh ip route 10.128.128.1<br>
Routing entry for <a href="http://10.128.128.0/30" rel="noreferrer" target="_blank">10.128.128.0/30</a><br>
Known via "connected", distance 0, metric 1, best<br>
Last update 00:25:07 ago<br>
* directly connected, disc0<br>
<br>
frr7# conf t<br>
frr7(config)# ip route <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a> 10.128.128.1<br>
% Warning!! Local connected address is configured as Gateway<br>
IP(10.128.128.1)<br>
<br>
frr7# sh ip route <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a><br>
% Network not in table<br>
frr7#<br>
<br>
---Mike<br>
<br>
<br>
<br>
On 10/1/2020 8:00 AM, Donald Sharp wrote:<br>
> Can we see the output of `show ip route 10.128.128.144` and `show ip<br>
> route connected`?<br>
><br>
> donald<br>
><br>
> On Wed, Sep 30, 2020 at 3:03 PM mike tancsa <<a href="mailto:mike@sentex.net" target="_blank">mike@sentex.net</a>> wrote:<br>
>> Up to version 6.x of frr, I have been able to tie down larger prefixes<br>
>> with a static routing pointing to the discard interface on FreeBSD.<br>
>><br>
>> eg. the static route entry<br>
>><br>
>> ip route <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a> 10.128.128.144<br>
>><br>
>> # sh ip route <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a><br>
>> Routing entry for <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a><br>
>> Known via "static", distance 1, metric 0, best<br>
>> Last update 09w0d01h ago<br>
>> * 10.128.128.144, via disc0<br>
>><br>
>> where disc0 is<br>
>><br>
>> # ifconfig disc0<br>
>> disc0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 65532<br>
>> inet 10.128.128.144 netmask 0xfffffffc<br>
>> inet6 fe80::1%disc0 prefixlen 64 scopeid 0x8<br>
>> inet6 2001:db8::1 prefixlen 64<br>
>> groups: disc<br>
>> nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL><br>
>><br>
>><br>
>> however, on frr7.4 this no longer works,<br>
>><br>
>> On my test box<br>
>><br>
>> % ifconfig disc0<br>
>> disc0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 65532<br>
>> inet 10.128.128.1 netmask 0xfffffffc<br>
>> inet6 fe80::1%disc0 prefixlen 64 scopeid 0x6<br>
>> groups: disc<br>
>> nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL><br>
>><br>
>><br>
>><br>
>> i3# conf t<br>
>> i3(config)# ip route <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a> 10.128.128.1<br>
>> % Warning!! Local connected address is configured as Gateway<br>
>> IP(10.128.128.1)<br>
>> i3(config)#<br>
>><br>
>> i3# sh ip route <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a><br>
>> % Network not in table<br>
>> i3#<br>
>><br>
>> If I user disc0, it seems to work, but I get warnings on start up<br>
>><br>
>> i3(config)# ip route <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a> disc0<br>
>><br>
>> i3# wr<br>
>> Note: this version of vtysh never writes vtysh.conf<br>
>> Building Configuration...<br>
>> Configuration saved to /usr/local/etc/frr/zebra.conf<br>
>> Configuration saved to /usr/local/etc/frr/bgpd.conf<br>
>> Configuration saved to /usr/local/etc/frr/staticd.conf<br>
>> i3# sh ip route <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a><br>
>> Routing entry for <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a><br>
>> Known via "static", distance 1, metric 0, best<br>
>> Last update 00:00:07 ago<br>
>> * directly connected, disc0, weight 1<br>
>><br>
>> i3#<br>
>><br>
>> 2020/09/30 14:57:53 STATIC: Static Route using disc0 interface not<br>
>> installed because the interface does not exist in specified vrf<br>
>> 2020/09/30 14:57:53 STATIC: Static Route using disc0 interface not<br>
>> installed because the interface does not exist in specified vrf<br>
>><br>
>> the kernel routing table does seem to have it installed<br>
>><br>
>><br>
>> # netstat -nra | grep 10.0.0<br>
>> <a href="http://10.0.0.0/8" rel="noreferrer" target="_blank">10.0.0.0/8</a> disc0 U1 0 65532 disc0<br>
>> #<br>
>><br>
>> What is the "proper" way to do this on frr7x ?<br>
>><br>
>> Thanks<br>
>><br>
>> ---Mike<br>
>><br>
>><br>
>><br>
>><br>
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</blockquote></div>