Re: bgpd loadbalancing feature

hi


thank you for answer!

Holger


On 13.08.22 08:50, Claudio Jeker wrote:
> On Sat, Aug 13, 2022 at 08:27:53AM +0200, Holger Glaess wrote:
>> hi
>>
>>
>> i need a little bit help to understand how i can check if
>>
>> the new openbgpd do the loadbalancing
>>
>>
>> wendehals# bgpctl sh nei 172.16.2.251
>> BGP neighbor is 172.16.2.251, remote AS 65010
>>   BGP version 4, remote router-id 172.16.2.251
>>   BGP state = Established, up for 00:14:33
>>   Last read 00:00:03, holdtime 90s, keepalive interval 30s
>>   Last write 00:00:03
>>   Neighbor capabilities:
>>     Multiprotocol extensions: IPv4 unicast, IPv4 vpn
>>     4-byte AS numbers
>>     Route Refresh
>>     Graceful Restart
>>     Add-path: IPv4 unicast bidir, IPv4 vpn bidir
>>   Negotiated capabilities:
>>     Multiprotocol extensions: IPv4 unicast, IPv4 vpn
>>     4-byte AS numbers
>>     Route Refresh
>>     Graceful Restart
>>     Add-path: IPv4 unicast bidir, IPv4 vpn bidir
>>
>>   Message statistics:
>>                   Sent       Received
>>   Opens                    3          3
>>   Notifications            0          2
>>   Updates                 26         25
>>   Keepalives              98         98
>>   Route Refresh            0          0
>>   Total                  127        128
>>
>>   Update statistics:
>>                   Sent       Received
>>   Prefixes                 9          9
>>   Updates                  9          9
>>   Withdraws                0          0
>>   End-of-Rib               2          2
>>   Route Refresh statistics:
>>   Request                  0          0
>>   Begin-of-RR              0          0
>>   End-of-RR                0          0
>>
>>   Last received shutdown reason: "bgpd shutting down"
>>   Local host:          172.16.2.252, Local port:    179
>>   Remote host:         172.16.2.251, Remote port: 48848
>>
>>
>> mean the bidir flag my neibgbor have loadbalancing configured and active ?
>>
>>
>> wendehals# bgpctl sh rib
>> flags: * = Valid, > = Selected, I = via IBGP, A = Announced,
>>        S = Stale, E = Error
>> origin validation state: N = not-found, V = valid, ! = invalid
>> origin: i = IGP, e = EGP, ? = Incomplete
>>
>> flags ovs destination          gateway          lpref   med aspath origin
>> *>      N 172.16.1.1/32        172.16.12.5       100     0 65100 i
>> *m      N 172.16.1.1/32        172.16.13.1       100     1 65101 i
>> I*      N 172.16.1.1/32        172.16.13.5       100     1 65101 i
>> I*      N 172.16.1.1/32        172.16.12.1       100     0 65100 i
>> *>      N 172.16.1.2/32        172.16.12.5       100     1 65100 i
>> *m      N 172.16.1.2/32        172.16.13.1       100     0 65101 i
>> I*      N 172.16.1.2/32        172.16.13.5       100     0 65101 i
>> I*      N 172.16.1.2/32        172.16.12.1       100     1 65100 i
>> I*>     N 172.16.2.251/32      172.16.2.251      100     0 i
>> *       N 172.16.2.251/32      172.16.12.5       100    11 65100 i
>> *       N 172.16.2.251/32      172.16.13.1       100    11 65101 i
>> I*      N 172.16.2.251/32      172.16.12.2       100    11 65100 i
>> I*      N 172.16.2.251/32      172.16.13.6       100    11 65101 i
>> AI*>    N 172.16.2.252/32      0.0.0.0           100     0 i
>> *       N 172.16.2.252/32      172.16.12.6       100    11 65100 i
>> *       N 172.16.2.252/32      172.16.13.2       100    11 65101 i
>> I*      N 172.16.2.252/32      172.16.13.5       100    11 65101 i
>> I*      N 172.16.2.252/32      172.16.12.1       100    11 65100 i
>>
>>
>> i see 2 paths with asterisk to 172.16.2.252 ,
>>
>> this should say loadblancing is active ?
>>
>>
>> is there an other opportunity  to check if the bgpd have loadblancing active
>> ?
>>
> If with loadbalancing you mean ECMP routing. Then no, bgpd does not
> support equal cost multipath. Only one (the best marked '>') is used for
> forwarding traffic.
>
> There is slow work ongoing to make ECMP happen but don't expect it anytime
> soon.