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

[Donald Sharp]

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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