[FROG] Originating Default EVPN Type-5 Routes with frr

[Donald Sharp]

All -

Martin and I had some further discussion about this issue offline and
we discovered that you currently *must* put the default instance of
bgp before the `router bgp 55 vrf DONNA` as well in order for this to
work currently.  We are working on fixing this ordering issue as well.

donald

On Wed, Jul 11, 2018 at 1:49 PM, Donald Sharp
<sharpd at cumulusnetworks.com> wrote:
> Martin -
>
> This appears to be an order of operations issue and an actual bug in the code.
>
> You must order this this way:
> !
> vrf DONNA
>  vni 3939
>  exit-vrf
> !
> router bgp 55 vrf DONNA
>  !
>  address-family l2vpn evpn
>   default-originate ipv4
>  exit-address-family
> !
>
> The vni under `vrf DONNA` must be there or the `default-originate
> ipv4` command is accepted and quietly ignored.  Additionally you
> cannot add the `default-originate ipv4` command before the vni command
> under the vrf.
>
> Looks like we have an issue that needs to be handled.
>
> donald
>
> On Wed, Jul 11, 2018 at 7:34 AM, Martin Mailand <martin at tuxadero.com> wrote:
>> Hello,
>>
>> I am playing around with FRR and EVPN. My setup is very simple, I have two virtual machines running Linux, which are connected back to back and are called border leaf and normal leaf.
>> I have compiled FRR from git head with the option --enable-cumulus. Type 2,3,5 routes are working in a symmetric routing environment.
>>
>> Now I want to inject a default route from the border leaf, which should be a type 5 route and it should be written down to the vrf of the normal leaf.
>>
>> But the documentation is a bit sparse, according to the cumulus docs it should go into the vrf part of the bgp configuration:
>>
>> —snip—
>> switch(config)# router bgp 650030 vrf vrf1
>> switch(config-router)# address-family l2vpn evpn
>> switch(config-router-af)# default-originate ipv4
>> switch(config-router-af)# default-originate ipv6
>> switch(config-router-af)# exit
>> switch(config-router)# exit
>> switch(config)# exit
>> switch# write memory
>> —snap—
>>
>> source: https://docs.cumulusnetworks.com/display/DOCS/Ethernet+Virtual+Private+Network+-+EVPN
>>
>> But with this configuration I do not see any default type 5 routes in the RIB.
>>
>> If I put the statements "default-originate ipv(4|6)“ into the main bgp section I get routes in the RIB. But I do not know how to read the RD (as2 0:0)
>> And the two default routes are not in the VRF FIB either.
>>
>> Border leaf RIB:
>>
>> show bgp l2vpn evpn
>> Route Distinguisher: as2 0:0
>>
>> *> [5]:[0]:[0]:[0.0.0.0]
>>                     0.0.0.0                            32768 i
>> *> [5]:[0]:[0]:[::] 0.0.0.0                            32768 i
>>
>> Normal leaf RIB:
>>
>> Route Distinguisher: as2 0:0
>>
>> *>i[5]:[0]:[0]:[0.0.0.0]
>>                     192.168.0.3                   100      0 i
>> *>i[5]:[0]:[0]:[::] 192.168.0.3                   100      0 i
>>
>> Any hint would be appreciated to get it up and running.
>>
>> Thanks for your time.
>>
>>
>> Best regards,
>>  martin
>>
>>
>> Here the two configs.
>>
>> border leaf:
>>
>> vrf vrf1
>>  vni 8000
>> !
>> # VRF1
>> router bgp 1234 vrf vrf1
>> !
>>  bgp router-id 192.168.10.3
>>  !
>>  address-family ipv4 unicast
>>   redistribute connected
>>  exit-address-family
>>  !
>>  address-family ipv6 unicast
>>   redistribute connected
>>  exit-address-family
>>  !
>>  address-family l2vpn evpn
>>   advertise ipv4 unicast
>>   advertise ipv6 unicast
>>   # should be here according to the cumulus docs
>>   # default-originate ipv4
>>   # default-originate ipv6
>>  exit-address-family
>> !
>> ## Global
>> router bgp 1234
>>  bgp router-id 192.168.10.3
>>  neighbor 192.168.0.4 remote-as 1234
>>  #redistribute connected route-map loopbacks
>>  network 192.168.10.3/32
>>  !
>>  address-family l2vpn evpn
>>   neighbor 192.168.0.4 activate
>>   advertise-all-vni
>>   default-originate ipv4
>>   default-originate ipv6
>>  exit-address-family
>> !
>> route-map loopbacks permit 10
>>  match interface lo
>> !
>>
>> Normal leaf:
>>
>> vrf vrf1
>>  vni 8000
>> !
>> # VRF1
>> router bgp 1234 vrf vrf1
>> !
>>  bgp router-id 192.168.10.4
>>  !
>>  address-family ipv4 unicast
>>   redistribute connected
>>  exit-address-family
>>  !
>>  address-family ipv6 unicast
>>   redistribute connected
>>  exit-address-family
>>  !
>>  address-family l2vpn evpn
>>   advertise ipv4 unicast
>>   advertise ipv6 unicast
>>  exit-address-family
>> !
>> # Global
>> router bgp 1234
>>  bgp router-id 192.168.10.4
>>  neighbor 192.168.0.3 remote-as 1234
>>  # redistribute connected route-map loopback
>>  network 192.168.10.4/32
>>  !
>>  address-family l2vpn evpn
>>   neighbor 192.168.0.3 activate
>>   advertise-all-vni
>>  exit-address-family
>> !
>> route-map loopbacks permit 10
>>  match interface lo
>> !
>>
>>
>>
>>
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