[Routing Issue] There are two same net range routing on routing table.

[이재용]

Hello~!

i'm using  bird 2.0.10 ,1.6.3. both of them have same problem.
After restarting bird.service, Routing has been normalized. 
Because of this, I don't think I can find the phenomenon in the command you mentioned (route all)
when i checked "route all" in a trouble, there was only same value shown below  
Detailed setting values may be problematic, so we will replace them with *.


------------- route all ----------------
BIRD 2.0.10 ready.Table master4:10.171.0.0/24 unicast [as1 2024-05-27] * (100) [********]   via 10.171.0.25 on p0   Type: BGP univ   BGP.origin: IGP   BGP.as_path: 65200   BGP.next_hop: 10.171.51.1   BGP.local_pref: 100                    unicast [as2 2024-05-27] (100) [********]   via 10.171.1.25 on p1   Type: BGP univ
   BGP.origin: IGP   BGP.as_path: 65200   BGP.next_hop: 10.171.151.1   BGP.local_pref: 50

------------ config -------------------
log "/var/log/bird/bird.log" all;debug protocols all;protocol kernel {  persist;  scan time *;  merge paths on;  ipv4 {     import none;     export all;     };}protocol bgp as1 {   ipv4 {     import all;    export all;  };  local *.*.*.* as *;  neighbor *.*.*.* as *;  direct;  enable route refresh off;  hold time *;  error wait time *,*;  capabilities on;  allow bgp_local_pref;  advertise hostname on;}protocol bgp as2 {  ipv4 {    import all;    export all;  };  local *.*.*.* as *;  neighbor *.*.*.* as *;  direct;  enable route refresh off;  hold time *;  error wait time *,*;  capabilities on;  allow bgp_local_pref;  advertise hostname on;}


-----Original Message-----From: "Maria Matejka" maria.matejka at nic.cz mailto:maria.matejka at nic.czTo: "이재용" jaeyong.lee at nhn.com mailto:jaeyong.lee at nhn.com;Cc: bird-users at network.cz mailto:bird-users at network.cz;Sent: 2024-06-09 (일) 20:18:22 (UTC+09:00)Subject: Re: [Routing Issue] There are two same net range routing on routing table.
Hello!
Which version of BIRD and Linux kernel are you running? Could you please share your configuration file and dump of show route all?
Thanks,
Maria
On Mon, Jun 03, 2024 at 10:31:25AM +0900, 이재용 wrote: > Hello, > > We use BIRD for communication with servers with higher-level switches. > > But recently we came across the following case: > server run as a ecmp routing. > 10.171.0.0/24 proto bird > nexthop via 10.171.0.25 dev p0 weight 1 >     nexthop via 10.171.1.25 dev p1 weight 1 > For a change higher-level switches, we adjusted our ibgp LP value to flow traffic as a one path. As we expected, servers routing are changed as one path routing > 10.171.0.0/24 proto bird > but, one server has a two same net range routing. like this sample > case1) > 10.171.0.0/24 proto bird10.171.0.0/24 proto bird metric 32 > nexthop via 10.171.0.25 dev ${interface1}  >     nexthop via 10.171.1.25 dev ${interface2}  > case2 ) > 10.171.0.0/24 proto bird metric 3210.171.0.0/24 proto bird > nexthop via 10.171.0.25 dev ${interface1} >     nexthop via 10.171.1.25 dev ${interface2}  > in case1, there was any problem , but in case 2 it had. (flow packet as two paths)in my thought, pervious routing not deleted. So, two same range is now avaliable.if there are someone who have same problem, would you advise for this problem? >
– Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.

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