Im in the process of labbing EIGRP as the CE-PE protocol, in a standard MPLS L3 VPN setup, to further understand the BGP Cost-community attribute.
In labbing this in GNS3 the PE always seems to install the desired route via eigrp instead of via BGP...
In reading the design guide for bgp path diversity with a shadow RR it highlights the need to configure bgp bestpath igp-metric ignore on all RRs if they are not "collocated."
My question is, if the shadow RR is receiving an advertisement that is c...
Hello,
I am doing some research on how an autonomous ap establishes a CAPWAP(v6) session with its respective WLC (local segment). Based on Cisco documentation the ap sends a multicast to the 'All WLC multicast address' FF01::18C.
quote:
Broadcast do...
Hello, I am experimenting with root guard on my home lab and I came across something that is puzzling. I configured root guard on my 3560 (acting as core), and configured Root Guard on the trunk port leading connecting to a 3550 switch. I set the pri...
Hello,I have one switch that is auto-negotiating to 10 mbps (a-10) and I am curious as to why it is doing this. I have tried to separate laptops on two different ports and they keep negotiating to 10 mbps.Now I have another 3560 switch with the same ...
Brilliant, that makes perfect sense.. I would think in that scenario you would forget diverse path completely and let each RR reflect its own best route to the PE. But you answered my question.Thank you
Bear with me, I'm not giving up on this one...
Answering your question, if the RRs are on the same subnet and collocated then they would have 2 equal cost paths in their bgp table. When the Shadow RR reflects the diverse-path route (second oldest r...
So under the scenario where the RRs actually need the primary and alternate routes in their local routing table and the RRs are not collocated the igp metric would need to be ignored to overcome the bgp multipath requirement of same igp metric for bo...
Now disabling the IGP metric check on the PE receiving the advertisements in order to allow multipath makes sense. The guide points out that IGP metric ignore needs to be configured on both RRs. Why would IGP metric ignore need to be configured on th...
To go along with Julios comment, if you are going to use maximum-paths for ECMP make sure your BGP attributes for each ECMP desired route are the same as it relates to the best path selection process. 1. Weight2. local-pref3. as-path length4. origin5...
