https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892705#M940314 <P>According to the documentation, it should dynamically load balance the traffic across both paths.</P> <P>Do you have a support contract? If so, I would recommend opening a TAC case for further investigation.</P> Thu, 18 Jul 2019 12:09:21 GMT Marvin Rhoads 2019-07-18T12:09:21Z https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3891687#M940297 <P>I am receiving two default route from OSPF with same metric. All the routes in Area 0. It is preferring one router why ?&nbsp;</P> Fri, 21 Feb 2020 17:18:50 GMT https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3891687#M940297 uditsaxena 2020-02-21T17:18:50Z https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892046#M940302 <P>Are they coming in with the same metric?</P> Wed, 17 Jul 2019 15:52:06 GMT https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892046#M940302 Marvin Rhoads 2019-07-17T15:52:06Z https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892202#M940307 Yes, they are coming with same metric<BR /> Wed, 17 Jul 2019 19:15:59 GMT https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892202#M940307 uditsaxena 2019-07-17T19:15:59Z https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892371#M940310 <P>That's interesting.</P> <P>Are both routes in the table but the observed traffic prefers one over the other? If that's the case, the perhaps FTD is using per-destination load balancing algorithm as opposed to per-packet. I wasn't able to locate documentation stating which is the case.</P> Thu, 18 Jul 2019 02:40:54 GMT https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892371#M940310 Marvin Rhoads 2019-07-18T02:40:54Z https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892612#M940311 <P>Two default routes are coming with two different interfaces with same metric, this we can see by #show ospf rib but route is installed only through one interface (see the image for ref). But in case of router, if two default routes are coming with same metric from two different interfaces, it will do the load balancing. But FTD is not doing so. Just wanted to know how FTD is choosing path.</P> Thu, 18 Jul 2019 09:25:58 GMT https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892612#M940311 uditsaxena 2019-07-18T09:25:58Z https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892705#M940314 <P>According to the documentation, it should dynamically load balance the traffic across both paths.</P> <P>Do you have a support contract? If so, I would recommend opening a TAC case for further investigation.</P> Thu, 18 Jul 2019 12:09:21 GMT https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3892705#M940314 Marvin Rhoads 2019-07-18T12:09:21Z https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3894563#M940315 <P>Hi Marvin,</P><P>I opened a TAC case they say FTD does not load balance the traffic if it is receiving route with the same metric from two different interfaces as router do. It will install only one route and that will be based on the oldest path.</P> Mon, 22 Jul 2019 06:22:53 GMT https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3894563#M940315 uditsaxena 2019-07-22T06:22:53Z https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3894650#M940317 <P>Thanks for the update. That's concerning news. I would argue that it's not really doing ECMP at all - contrary to the product documentation. I will be sure to provide this feedback to Cisco!</P> Mon, 22 Jul 2019 08:56:11 GMT https://community.cisco.com/t5/network-security/path-preference-in-ftd/m-p/3894650#M940317 Marvin Rhoads 2019-07-22T08:56:11Z