<div style="font-family: system-ui; font-size: 14px"><div>Thank you for your reply.</div><div>Unfortunately, There is no krt_metric in my configure.</div><div><br></div><div>protocol kernel </div><div><span style="background-color: initial; letter-spacing: -0.3px;">{</span></div><div style="margin-left: 40px;">persist; <br>scan time 20; <br>merge paths on; <br>ipv4 {<br>import none; <br>export all;</div><div style="margin-left: 40px;">};</div><div>}</div><div><br></div><div>i'm using "merge paths on" option for ecmp. </div><div>is this option can be problem?</div><!-- end signature --></div><br><br>-----Original Message-----<br>From: "Alexander Zubkov" <green@qrator.net><br>To: "이재용" <jaeyong.lee@nhn.com>; <br>Cc: "BIRD Users" <bird-users@network.cz>; <br>Sent: 2024-06-03 (월) 14:17:50 (UTC+09:00)<br>Subject: Re: [Routing Issue] There are two same net range routing on routing table.<br><br><div dir="auto">Hi,<div dir="auto"><br></div><div dir="auto">Do you alter krt_metric in you kernel protocol export filter? That could cause such problem. There was recently a question about it in this mailing list.</div><div dir="auto"><br></div><div dir="auto">Regards, </div><div dir="auto">Alexander</div></div><br><div><div dir="ltr">On Mon, Jun 3, 2024, 03:40 이재용 <<a href="mailto:jaeyong.lee@nhn.com" target="_blank">jaeyong.lee@nhn.com</a>> wrote:<br></div><blockquote style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex;"><div style="font-family:system-ui; font-size:14px;"><div>Hello,</div><div><br></div><div>We use BIRD for communication with servers with higher-level switches.</div><div><br></div><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">But recently we came across the following case:</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">server run as a ecmp routing.</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;"><a href="http://10.171.0.0/24" target="_blank" rel="noreferrer">10.171.0.0/24</a> proto bird
nexthop via 10.171.0.25 dev p0 weight 1
nexthop via 10.171.1.25 dev p1 weight 1</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">For a change higher-level switches, we adjusted our ibgp LP value to flow traffic as a one path. </pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">As we expected, servers routing are changed as one path routing </pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;"><a href="http://10.171.0.0/24" target="_blank" rel="noreferrer">10.171.0.0/24</a> proto bird</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">but, one server has a two same net range routing. like this sample</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">case1) </pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;"><a href="http://10.171.0.0/24" target="_blank" rel="noreferrer">10.171.0.0/24</a> proto bird</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;"><a href="http://10.171.0.0/24" target="_blank" rel="noreferrer">10.171.0.0/24</a> proto bird metric 32
nexthop via 10.171.0.25 dev ${interface1}
nexthop via 10.171.1.25 dev ${interface2} </pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">case2 )</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;"><a href="http://10.171.0.0/24" target="_blank" rel="noreferrer">10.171.0.0/24</a> proto bird metric 32</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;"><a href="http://10.171.0.0/24" target="_blank" rel="noreferrer">10.171.0.0/24</a> proto bird
nexthop via 10.171.0.25 dev ${interface1}
nexthop via 10.171.1.25 dev ${interface2} </pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">in case1, there was any problem , but in case 2 it had. (flow packet as two paths)</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">in my thought, pervious routing not deleted. </pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">So, two same range is now avaliable.</pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">if there are someone who have same problem, would you advise for this problem? </pre><pre style="white-space:pre-wrap; color:rgb(0,0,0); font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; word-spacing:0px; text-decoration-style:initial; text-decoration-color:initial;">
</pre></div>
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