Wrong BGP NH metric

[Mihai]

Hi Maria,

Yes you are correct, the metric is not a random value but an old value, 
probably the first one after OSPF established.
It looks like any subsequent change in the OSPF topology/metrics is not 
reflected in the BGP_NH metric.

Best regards,
Mihai

On 03/10/2022 12:43, Maria Matejka via Bird-users wrote:
> Hello!
> 
> I'd suspect the internal nexthop resolving mechanisms of missing the 
> OSPF route update. When working on the multithreaded version, I came 
> across a similar kind of bug and I honestly don't know yet how exactly 
> this may be broken.
> 
> That said, is it possible that the metric is just an obsolete value from 
> some previous route version?
> 
> Thanks for your report.
> 
> Maria
> 
> On 9/30/22 17:10, Mihai via Bird-users wrote:
>> Hello,
>>
>> The same issue on another RR, the BGP_Metric=60380 while the 
>> OSPF_Metric=60315.
>>
>> bird> sh route 10:10 202.81.16.0/24 all
>> Table vpntab4:
>> 10:10 202.81.16.0/24 unicast [ROUTER2 2022-09-29 15:21:18 from 
>> 10.100.186.6] * (100/60380) [AS4826i]
>>          Type: BGP univ
>>          BGP.origin: IGP
>>          BGP.as_path: 4826
>>          BGP.next_hop: 10.100.186.6
>>
>> bird> show route 10.100.186.6/32
>> Table master4:
>> 10.100.186.6/32      unicast [OSPF 2022-09-30 15:01:51] IA (150/60315) 
>> [10.100.186.4]
>>
>>
>>
>> On 30/09/2022 09:08, Mihai wrote:
>>> Hello,
>>>
>>> First I would like to thank you for this amazing software!
>>>
>>> I am running Bird 2.0.7 as RR for L3VPNs and on one RR the OSPF 
>>> metric for the BGP NH is different than what's seen in BGP as shown 
>>> below.
>>>
>>> BGP PREF/METRIC = (100/61580) , OSPF_METRIC = 61480.
>>>
>>>
>>> bird> sh route 10:10 94.207.96.0/19 all primary
>>> Table vpntab4:
>>> 10:10 94.207.96.0/19 unicast [ROUTER1 2022-09-28 00:10:09 from 
>>> 10.100.186.1] * (100/61580) [AS15802i]
>>>          Type: BGP univ
>>>          BGP.origin: IGP
>>>          BGP.as_path: 15802
>>>          BGP.next_hop: 10.100.184.8
>>>
>>> bird> sh route 10.100.184.8/32
>>> Table master4:
>>> 10.100.184.8/32      unicast [OSPF 2022-09-29 12:33:35] IA 
>>> (150/61480) [10.100.186.5]
>>>
>>> After restarting the BIRD OSPF adjancency the BGP metric changed to 
>>> 61480.
>>>
>>>
>>> Any help in understanding the issue would be much appreciated.
>>>
>>> Thank you!
>>
>>