[c-nsp] EVPN-VPWS PW and AC status coupling

[Marco Marzetti]

Adam,

You're right. I didn't explain it well.
PW is UP, but LDP propagates AC status to the other end.

Anyway it doesn't look to be supported by EVPNs, which is a pity.

Regards


On Fri, Feb 9, 2018 at 2:29 PM,  <adamv0025 at netconsultings.com> wrote:
>> Marco Marzetti
>> Sent: Friday, February 09, 2018 10:34 AM
>>
>> Hello,
>>
>> It's been a few weeks I've been working on EVPNs and IOS-XR 6.1 and i
>> wonder if ther's a way to couple AC and PW status so that you can
> propagate
>> PE-CE link failures end-to-end.
>>
>> I know it's supported for "regular" EVPNs (RFC7432), but EVPN-VPWS
>> (RFC8214) is definitely a special case.
>>
>> Here's my configuration snippets
>>
>> !
>> hostname XRV1
>> !
>> interface GigabitEthernet0/0/0/0.200 l2transport  encapsulation dot1q 200
> !
>> router bgp 64496
>>  bgp router-id 192.0.2.1
>>  address-family l2vpn evpn
>>  !
>>  neighbor 192.0.2.2
>>   remote-as 64496
>>   local address 192.0.2.1
>>   address-family l2vpn evpn
>>   !
>>  !
>> !
>> l2vpn
>>  xconnect group test
>>   p2p test
>>    interface GigabitEthernet0/0/0/0.200
>>    neighbor evpn evi 100 target 300 source 200
>>   !
>>  !
>> !
>>
>>
>> !
>> hostname XRV2
>> !
>> interface GigabitEthernet0/0/0/0.300 l2transport  encapsulation dot1q 300
> !
>> router bgp 64496
>>  bgp router-id 192.0.2.2
>>  address-family l2vpn evpn
>>  !
>>  neighbor 192.0.2.1
>>   remote-as 64496
>>   local address 192.0.2.2
>>   address-family l2vpn evpn
>>   !
>>  !
>> !
>> l2vpn
>>  xconnect group test
>>   p2p test
>>    interface GigabitEthernet0/0/0/0.300
>>    neighbor evpn evi 100 target 200 source 300
>>   !
>>  !
>> !
>>
>>
>> What i'd expect is XRV1 to turn Gi0/0/0/0.200 down when XRV2 withdraws
>> the BGP advertisements.
>>
>> Is that supported?
>>
> Hmm I'm getting a bit rusty on the Carrier-Ethernet stuff but isn't that the
> other way around?
> I mean what I remember is that if AC goes down that in turn brings down the
> PW -but the bit where the PW failure propagating to the other end then in
> turn brings the AC down on that end too  -that one I don't recall to be
> honest.  (Would I need to enable that with some knob first?)
> And what if the other end is configured with PW-redundancy -in that case I'd
> need the AC at remote end to stay up and just use the backup PW.
>
> Sure if you run LFM or the whole CFM suite end-to-end, then that could bring
> down ACs at both ends in case any component along the path fails.
>
>
> adam
>
> netconsultings.com
> ::carrier-class solutions for the telecommunications industry::
>



-- 
Marco