<div dir="ltr"><div>Hello,</div><div><br></div><div>I am running BIRD 1.4.2 on two Ubuntu Linux 12.04 systems acting as border routers. Two eBGP peers on each with iBGP between them. OSPF also between them and internally.</div>
<div><br></div><div>I notice that on reboot 10-15 packets both in and out are lost. This seems to happen just as/after the bird process starts. It appears as if perhaps BGP is establishing prior to the OSPF neighbors coming up and as a result black-holing traffic. I am nailing down my public IP prefixes with null routes.</div>
<div><br></div><div>I have attempted to use the 'start delay time x' command under the BGP sessions however they still establish immediately. I believe this is because this command delays the outbound attempt to connect yet the remote side is initiating it.</div>
<div><br></div><div><div># eBGP session to X</div><div>protocol bgp eBGP_X {</div><div> description "eBGP - X";</div><div> local as X;</div><div> neighbor x.x.x.x as x;</div><div><b><span class="" style="white-space:pre"> </span>start delay time 60;</b></div>
<div><span class="" style="white-space:pre"> </span>import filter import_eBGP_X;</div><div><span class="" style="white-space:pre"> </span>export filter export_eBGP_X;</div><div>}</div></div><div><br></div><div>Has anyone else ran into this problem with a similar design? Is there a different command to prevent BGP peering from establishing or to wait for the IGP?</div>
<div><br></div><div>I have implemented a workaround/hack by filtering incoming TCP connections with destination port 179. This prevents the peers from being established until the <i>start delay time</i> is reached. I will review my routing configuration/design however is there another way to accomplish this?</div>
<div><br></div><div>Thanks!</div><div><br>Tom.</div><div><br></div><br></div>