[FROG] simple frr ospf example setup

Donald Sharp sharpd at cumulusnetworks.com
Sat Aug 22 19:23:04 UTC 2020 

Additionally I would use `-N XXX` where XXX would be the appropriate
namespace for both sides.  This is important to do for vtysh as well

donald

On Sat, Aug 22, 2020 at 3:20 PM Don Slice <dslice at cumulusnetworks.com> wrote:
>
> “Show ip ospf interface” on both switches may be helpful. Also tcpdump on the interface for proto ospf to see if hellos are being sent and received.
>
> On Fri, Aug 21, 2020 at 5:21 PM Moritz Warning <moritzwarning at web.de> wrote:
>>
>> You are right, ping is not happy about 192.168.1.0. So I switched to 192.168.1.1 and 192.168.1.2.
>>
>> Ping works in both directions. But ospfd still list an empty table for "show ip ospf neighbor".
>>
>>
>>
>> All commands again for nodes 1 and 2:
>>
>>
>>
>> $ sudo netns add ns-1
>>
>>
>>
>> $ sudo netns add ns-2
>>
>>
>>
>> $ sudo ip netns exec ns-1 ip a a 192.168.1.1/24 dev uplink
>>
>>
>>
>> $ sudo ip netns exec ns-2 ip a a 192.168.1.2/24 dev uplink
>>
>>
>>
>> $ sudo ip netns exec ns-1 ip a
>>
>> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
>>
>>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>>
>>     inet 127.0.0.1/8 scope host lo
>>
>>        valid_lft forever preferred_lft forever
>>
>>     inet6 ::1/128 scope host
>>
>>        valid_lft forever preferred_lft forever
>>
>> 4: uplink at if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
>>
>>     link/ether 12:bc:58:4f:6c:c5 brd ff:ff:ff:ff:ff:ff link-netns switch
>>
>>     inet 192.168.1.1/24 scope global uplink
>>
>>        valid_lft forever preferred_lft forever
>>
>>     inet6 fe80::10bc:58ff:fe4f:6cc5/64 scope link
>>
>>        valid_lft forever preferred_lft forever
>>
>>
>>
>> $ sudo ip netns exec ns-2 ip a
>>
>> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
>>
>>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>>
>>     inet 127.0.0.1/8 scope host lo
>>
>>        valid_lft forever preferred_lft forever
>>
>>     inet6 ::1/128 scope host
>>
>>        valid_lft forever preferred_lft forever
>>
>> 7: uplink at if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
>>
>>     link/ether 9e:84:c2:86:90:d8 brd ff:ff:ff:ff:ff:ff link-netns switch
>>
>>     inet 192.168.1.2/24 scope global uplink
>>
>>        valid_lft forever preferred_lft forever
>>
>>     inet6 fe80::9c84:c2ff:fe86:90d8/64 scope link
>>
>>        valid_lft forever preferred_lft forever
>>
>>
>>
>> $ sudo ip netns exec ns-2 ip r
>>
>> 192.168.1.0/24 dev uplink proto kernel scope link src 192.168.1.2
>>
>>
>>
>> $ sudo ip netns exec ns-1 ip r
>>
>> 192.168.1.0/24 dev uplink proto kernel scope link src 192.168.1.1
>>
>>
>>
>> $ sudo ip netns exec ns-2 ping 192.168.1.1
>>
>> PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
>>
>> 64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.110 ms
>>
>> ^C
>>
>> --- 192.168.1.1 ping statistics ---
>>
>> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
>>
>> rtt min/avg/max/mdev = 0.110/0.110/0.110/0.000 ms
>>
>>
>>
>> $ sudo ip netns exec ns-1 ping 192.168.1.2
>>
>> PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
>>
>> 64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=0.054 ms
>>
>> 64 bytes from 192.168.1.2: icmp_seq=2 ttl=64 time=0.063 ms
>>
>> ^C
>>
>> --- 192.168.1.2 ping statistics ---
>>
>> 2 packets transmitted, 2 received, 0% packet loss, time 1022ms
>>
>> rtt min/avg/max/mdev = 0.054/0.058/0.063/0.004 ms
>>
>>
>>
>> $ cat ospf1.conf
>>
>> router ospf
>>
>> ospf router-id 192.168.1.1
>>
>> network 192.168.1.0/24 area 1
>>
>>
>>
>> $ cat ospf2.conf
>>
>> router ospf
>>
>> ospf router-id 192.168.1.2
>>
>> network 192.168.1.0/24 area 1
>>
>>
>>
>> $ sudo ip netns exec ns-1 ospfd --terminal -f ./ospf1.conf -i /run/frr/ospfd1.pid
>>
>>
>>
>> $ sudo ip netns exec ns-2 ospfd --terminal -f ./ospf2.conf -i /run/frr/ospfd2.pid
>>
>>
>>
>>
>>
>> On 8/21/20 10:33 PM, Don Slice wrote:
>>
>> > Can you ping between the pertinent interfaces?  In other words, did you
>>
>> > verify reachability between 192.168.1.1 and 192.168.1.0?  BTW, I
>>
>> > would avoid using the .0 address on a /24.  Historically, this has
>>
>> > represented the subnet and not one of the addresses on the subnet.  There
>>
>> > are circumstances it makes sense (/31 addressing for example) but is
>>
>> > normally not done, at least as far as I know.
>>
>> >
>>
>> > On Fri, Aug 21, 2020 at 3:08 PM Moritz Warning <moritzwarning at web.de> wrote:
>>
>> >
>>
>> >> Hi,
>>
>> >>
>>
>> >> I am a newbie with frr/ospf. My aim is to run two ospfd instances in a
>>
>> >> Linux network namesspace each and let them talk to each other via a virtual
>>
>> >> link (interface called uplink).
>>
>> >>
>>
>> >> My test setup is attached. But I do not see any traffic. This is probably
>>
>> >> some basic configuration error. I did have a look at the documentation, but
>>
>> >> it did not seem to cover such simple setups.
>>
>> >> A few pointer in the right direction would be helpful.
>>
>> >>
>>
>> >> thanks,
>>
>> >> mwarning
>>
>> >>
>>
>> >>
>>
>> >> $ ip netns add ns-0
>>
>> >> $ ip netns add ns-1
>>
>> >>
>>
>> >> # Node 0:
>>
>> >>
>>
>> >> $ sudo ip netns exec ns-0 ip a
>>
>> >> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
>>
>> >> default qlen 1000
>>
>> >>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>>
>> >>     inet 127.0.0.1/8 scope host lo
>>
>> >>        valid_lft forever preferred_lft forever
>>
>> >>     inet6 ::1/128 scope host
>>
>> >>        valid_lft forever preferred_lft forever
>>
>> >> 4: uplink at if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
>>
>> >> state UP group default qlen 1000
>>
>> >>     link/ether ce:e6:b3:5d:d3:70 brd ff:ff:ff:ff:ff:ff link-netns switch
>>
>> >>     inet 192.168.1.0/24 scope global uplink
>>
>> >>        valid_lft forever preferred_lft forever
>>
>> >>     inet6 fe80::cce6:b3ff:fe5d:d370/64 scope link
>>
>> >>        valid_lft forever preferred_lft forever
>>
>> >>
>>
>> >> $ cat ospf0.conf
>>
>> >> router ospf
>>
>> >> ospf router-id 192.168.1.0
>>
>> >> network 192.168.1.0/24 area 1
>>
>> >>
>>
>> >> $ sudo ip netns exec ns-0 ospfd --terminal -f ./ospf0.conf -i
>>
>> >> /run/frr/ospfd0.pid
>>
>> >>
>>
>> >>
>>
>> >> # Node 1:
>>
>> >>
>>
>> >> $ sudo ip netns exec ns-1 ip a
>>
>> >> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
>>
>> >> default qlen 1000
>>
>> >>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>>
>> >>     inet 127.0.0.1/8 scope host lo
>>
>> >>        valid_lft forever preferred_lft forever
>>
>> >>     inet6 ::1/128 scope host
>>
>> >>        valid_lft forever preferred_lft forever
>>
>> >> 7: uplink at if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
>>
>> >> state UP group default qlen 1000
>>
>> >>     link/ether 12:45:ca:46:19:52 brd ff:ff:ff:ff:ff:ff link-netns switch
>>
>> >>     inet 192.168.1.1/24 scope global uplink
>>
>> >>        valid_lft forever preferred_lft forever
>>
>> >>     inet6 fe80::1045:caff:fe46:1952/64 scope link
>>
>> >>        valid_lft forever preferred_lft forever
>>
>> >>
>>
>> >> $ cat ospf1.conf
>>
>> >> router ospf
>>
>> >> ospf router-id 192.168.1.1
>>
>> >> network 192.168.1.0/24 area
>>
>> >>
>>
>> >> $ sudo ip netns exec ns-1 ospfd --terminal -f ./ospf1.conf -i
>>
>> >> /run/frr/ospfd1.pid
>>
>> >>
>>
>> >> _______________________________________________
>>
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>>
>> >> frog at lists.frrouting.org
>>
>> >> https://lists.frrouting.org/listinfo/frog
>>
>> >>
>>
>> >
>>
>> >
>>
>>
>>
> --
> Don Slice
> Cumulus Networks
> _______________________________________________
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